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Some experts displayed a top-down style of reasoning: politics as a deductive art. They started with a big-idea premise about human nature, society, or economics and applied it to the specifics of the case. They tended to reach more confident conclusions about the future. And the positions they reached were easier to classify ideologically: that is the Keynesian prediction and that is the free-market fundamentalist prediction and that is the worst-case environmentalist prediction and that is the best case technology-driven growth prediction etc. Other experts displayed a bottom-up style of reasoning: politics as a much messier inductive art. They reached less confident conclusions and they are more likely to draw on a seemingly contradictory mix of ideas in reaching those conclusions (sometimes from the left, sometimes from the right). We called the big-idea experts “hedgehogs” (they know one big thing) and the more eclectic experts “foxes” (they know many, not so big things).

The most consistent predictor of consistently more accurate forecasts was “style of reasoning”: experts with the more eclectic, self-critical, and modest cognitive styles tended to outperform the big-idea people (foxes tended to outperform hedgehogs).

Lehrer: Can non-experts do anything to encourage a more effective punditocracy?

Tetlock: Yes, non-experts can encourage more accountability in the punditocracy. Pundits are remarkably skillful at appearing to go out on a limb in their claims about the future, without actually going out on one. For instance, they often “predict” continued instability and turmoil in the Middle East (predicting the present) but they virtually never get around to telling you exactly what would have to happen to disconfirm their expectations. They are essentially impossible to pin down. If pundits felt that their public credibility hinged on participating in level playing field forecasting exercises in which they must pit their wits against an extremely difficult-to-predict world, I suspect they would be learn, quite quickly, to be more flexible and foxlike in their policy pronouncements.

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In one study, all the participants were presented with a numerical summary, drawn from a panel of experts convened by the University of Chicago, of the range of expert opinion on certain economic issues

One group of participants, however, was presented not only with the numerical summary of expert opinion but also with an excerpted comment from one expert on either side of an issue

, being exposed to the conflicting comments made it more difficult for participants to distinguish the issues most experts agreed on (such as carbon tax) from those for which there was substantial disagreement (such as minimum wage).

This distorting influence affected not only the participants’ perception of the degree of consensus, but also their judgments of whether there was sufficient consensus to use it to guide public policy.

What explains this cognitive glitch? One possibility is that when we are presented with comments from experts on either side of an issue, we produce a mental representation of the disagreement that takes the form of one person on either side, which somehow contaminates our impression of the distribution of opinions in the larger population of experts

Another possibility is that we may just have difficulty discounting the weight of a plausible argument, even when we know it comes from an expert whose opinion is held by only a small fraction of his or her peers.

It’s also possible that the mere presence of conflict (in the form of contradictory expert comments) triggers a general sense of uncertainty in our minds, which in turn colors our perceptions of the accuracy of current expert understanding of an issue.

the implications are worrisome. Government action is guided in part by public opinion. Public opinion is guided in part by perceptions of what experts think. But public opinion may — and often does — deviate from expert opinion, not simply, it seems, because the public refuses to acknowledge the legitimacy of experts, but also because the public may not be able to tell where the majority of expert opinion lies.

the coronavirus more often infects clusters of family members, friends and work colleagues,

“You can contain clusters,” Dr. Heymann said. “You need to identify and stop discrete outbreaks, and then do rigorous contact tracing.”

The microphone should not even be at the White House, scientists said, so that briefings of historic importance do not dissolve into angry, politically charged exchanges with the press corps, as happened again on Friday.

Americans must be persuaded to stay home, they said, and a system put in place to isolate the infected and care for them outside the home

Travel restrictions should be extended, they said; productions of masks and ventilators must be accelerated, and testing problems must be resolved.

It was not at all clear that a nation so fundamentally committed to individual liberty and distrustful of government could learn to adapt to many of these measures, especially those that smack of state compulsion.

What follows are the recommendations offered by the experts interviewed by The Times.

they were united in the opinion that politicians must step aside and let scientists both lead the effort to contain the virus and explain to Americans what must be done.

medical experts should be at the microphone now to explain complex ideas like epidemic curves, social distancing and off-label use of drugs.

doing so takes intelligent, rapidly adaptive work by health officials, and near-total cooperation from the populace. Containment becomes realistic only when Americans realize that working together is the only way to protect themselves and their loved ones.

Above all, the experts said, briefings should focus on saving lives and making sure that average wage earners survive the coming hard times — not on the stock market, the tourism industry or the president’s health.

“At this point in the emergency, there’s little merit in spending time on what we should have done or who’s at fault,”

The next priority, experts said, is extreme social distancing.If it were possible to wave a magic wand and make all Americans freeze in place for 14 days while sitting six feet apart, epidemiologists say, the whole epidemic would sputter to a halt.

The virus would die out on every contaminated surface and, because almost everyone shows symptoms within two weeks, it would be evident who was infected. If we had enough tests for every American, even the completely asymptomatic cases could be found and isolated.

The crisis would be over.

Obviously, there is no magic wand, and no 300 million tests. But the goal of lockdowns and social distancing is to approximate such a total freeze.

In contrast to the halting steps taken here, China shut down Wuhan — the epicenter of the nation’s outbreak — and restricted movement in much of the country on Jan. 23, when the country had a mere 500 cases and 17 deaths.Its rapid action had an important effect: With the virus mostly isolated in one province, the rest of China was able to save Wuhan.

Even as many cities fought their own smaller outbreaks, they sent 40,000 medical workers into Wuhan, roughly doubling its medical force.

Stop transmission within cities

the weaker the freeze, the more people die in overburdened hospitals — and the longer it ultimately takes for the economy to restart.

People in lockdown adapt. In Wuhan, apartment complexes submit group orders for food, medicine, diapers and other essentials. Shipments are assembled at grocery warehouses or government pantries and dropped off. In Italy, trapped neighbors serenade one another.

Each day’s delay in stopping human contact, experts said, creates more hot spots, none of which can be identified until about a week later, when the people infected there start falling ill.

South Korea avoided locking down any city, but only by moving early and with extraordinary speed. In January, the country had four companies making tests, and as of March 9 had tested 210,000 citizens — the equivalent of testing 2.3 million Americans.

As of the same date, fewer than 9,000 Americans had been tested.

Fix the testing mess

Testing must be done in a coordinated and safe way, experts said. The seriously ill must go first, and the testers must be protected.In China, those seeking a test must describe their symptoms on a telemedicine website. If a nurse decides a test is warranted, they are directed to one of dozens of “fever clinics” set up far from all other patients.

Isolate the infected

As soon as possible, experts said, the United States must develop an alternative to the practice of isolating infected people at home, as it endangers families. In China, 75 to 80 percent of all transmission occurred in family clusters.

Cellphone videos from China show police officers knocking on doors and taking temperatures. In some, people who resist are dragged away by force. The city of Ningbo offered bounties of $1,400 to anyone who turned in a coronavirus sufferer.

In China, said Dr. Bruce Aylward, leader of the World Health Organization’s observer team there, people originally resisted leaving home or seeing their children go into isolation centers with no visiting rights — just as Americans no doubt would.

In China, they came to accept it.“They realized they were keeping their families safe,” he said. “Also, isolation is really lonely. It’s psychologically difficult. Here, they were all together with other people in the same boat. They supported each other.”

Find the fevers

Make masks ubiquitous

In China, having a fever means a mandatory trip to a fever clinic to check for coronavirus. In the Wuhan area, different cities took different approaches.

In most cities in affected Asian countries, it is commonplace before entering any bus, train or subway station, office building, theater or even a restaurant to get a temperature check. Washing your hands in chlorinated water is often also required.

The city of Qianjiang, by contrast, offered the same amount of money to any resident who came in voluntarily and tested positive

Voluntary approaches, like explaining to patients that they will be keeping family and friends safe, are more likely to work in the West, she added.

Trace the contacts

Finding and testing all the contacts of every positive case is essential, experts said. At the peak of its epidemic, Wuhan had 18,000 people tracking down individuals who had come in contact with the infected.

Dr. Borio suggested that young Americans could use their social networks to “do their own contact tracing.” Social media also is used in Asia, but in different ways

When he lectured at a Singapore university, Dr. Heymann said, dozens of students were in the room. But just before he began class, they were photographed to record where everyone sat.

Instead of a policy that advises the infected to remain at home, as the Centers for Disease and Prevention now does, experts said cities should establish facilities where the mildly and moderately ill can recuperate under the care and observation of nurses.

There is very little data showing that flat surgical masks protect healthy individuals from disease. Nonetheless, Asian countries generally make it mandatory that people wear them.

The Asian approach is less about data than it is about crowd psychology, experts explained.All experts agree that the sick must wear masks to keep in their coughs. But if a mask indicates that the wearer is sick, many people will be reluctant to wear one. If everyone is required to wear masks, the sick automatically have one on and there is no stigma attached.

Also, experts emphasized, Americans should be taught to take seriously admonitions to stop shaking hands and hugging

Preserve vital services

Only the federal government can enforce interstate commerce laws to ensure that food, water, electricity, gas, phone lines and other basic needs keep flowing across state lines to cities and suburbs

“I sense that most people — and certainly those in business — get it. They would prefer to take the bitter medicine at once and contain outbreaks as they start rather than gamble with uncertainty.”

Produce ventilators and oxygen

The manufacturers, including a dozen in the United States, say there is no easy way to ramp up production quickly. But it is possible other manufacturers, including aerospace and automobile companies, could be enlisted to do so.

Canadian nurses are disseminating a 2006 paper describing how one ventilator can be modified to treat four patients simultaneously. Inventors have proposed combining C-PAP machines, which many apnea sufferers own, and oxygen tanks to improvise a ventilator.

One of the lessons of China, he noted, was that many Covid-19 patients who would normally have been intubated and on ventilators managed to survive with oxygen alone.

Retrofit hospitals

In Wuhan, the Chinese government famously built two new hospitals in two weeks. All other hospitals were divided: 48 were designated to handle 10,000 serious or critical coronavirus patients, while others were restricted to handling emergencies like heart attacks and births.

Wherever that was impractical, hospitals were divided into “clean” and “dirty” zones, and the medical teams did not cross over. Walls to isolate whole wards were built

Decide when to close schools

Recruit volunteers

China’s effort succeeded, experts said, in part because of hundreds of thousands of volunteers. The government declared a “people’s war” and rolled out a “Fight On, Wuhan! Fight On, China!” campaign.

Many people idled by the lockdowns stepped up to act as fever checkers, contact tracers, hospital construction workers, food deliverers, even babysitters for the children of first responders, or as crematory workers.

“In my experience, success is dependent on how much the public is informed and participates,” Admiral Ziemer said. “This truly is an ‘all hands on deck’ situation.”

Prioritize the treatments

Clinicians in China, Italy and France have thrown virtually everything they had in hospital pharmacies into the fight, and at least two possibilities have emerged that might save patients: the anti-malaria drugs chloroquine and hydroxychloroquine, and the antiviral remdesivir, which has no licensed use.

An alternative is to harvest protective antibodies from the blood of people who have survived the illness,

The purified blood serum — called immunoglobulin — could possibly be used in small amounts to protect emergency medical workers, too.

“Unfortunately, the first wave won’t benefit from this,” Dr. Hotez said. “We need to wait until we have enough survivors.”Find a vaccine

testing those candidate vaccines for safety and effectiveness takes time.

The roadblock, vaccine experts explained, is not bureaucratic. It is that the human immune system takes weeks to produce antibodies, and some dangerous side effects can take weeks to appear.

After extensive animal testing, vaccines are normally given to about 50 healthy human volunteers to see if they cause any unexpected side effects and to measure what dose produces enough antibodies to be considered protective.

If that goes well, the trial enrolls hundreds or thousands of volunteers in an area where the virus is circulating. Half get the vaccine, the rest do not — and the investigators wait. If the vaccinated half do not get the disease, the green light for production is finally given.

In the past, some experimental vaccines have produced serious side effects, like Guillain-Barre syndrome, which can paralyze and kill. A greater danger, experts said, is that some experimental vaccines, paradoxically, cause “immune enhancement,” meaning they make it more likely, not less, that recipients will get a disease. That would be a disaster.

One candidate coronavirus vaccine Dr. Hotez invented 10 years ago in the wake of SARS, he said, had to be abandoned when it appeared to make mice more likely to die from pneumonia when they were experimentally infected with the virus.

Reach out to other nations

“To reject the advice of experts is to assert autonomy, a way for Americans to insulate their increasingly fragile egos from ever being told they’re wrong about anything.”

Nichols is best known these days as an outspoken “Never Trump” Republican, a lifelong conservative

In December, Politico named Nichols to its annual list of 50 people whose ideas are “blowing up American politics,” and Foreign Affairs listed an article excerpted from his book as one of its best, and best-read, of 2017. Readers regularly approach Nichols with stories of their own disregarded expertise: doctors, lawyers, plumbers, electricians who’ve gotten used to being second-guessed by customers and clients and patients who know little or nothing about their work. “So many people over the past year have walked up to me and said, ‘You wrote what I was thinking,’” he says. 

His own expertise is in nuclear policy and Russian affairs—during the Cold War, he was what was called a Sovietologist—and Nichols is a professor at the U.S. Naval War College. Since 2005 he has also taught at the extension school, on subjects like international security, nuclear deterrence, and Cold War pop culture

The Death of Expertise diagnoses a malady decades in the making, for which Trump represents only one case, albeit perhaps its most famous and extreme. “I didn’t know ahead of time that Trump was going to happen,” Nichols says now, “but I knew that someday something like him would.” 

“It strikes me that the affluence and convenience of modern society lull people into thinking that it all kind of happens magically, without any human intervention. People live in a world that functions, and not just because of technical experts, but policy experts too.”

Meanwhile, the Internet’s openness offers a “Google-fueled, Wikipedia-based, blog-sodden” mirage of knowledge, Nichols argues, and an inexhaustible supply of “facts” to feed any confirmation bias. “The Internet encourages not only the illusion that we are all equally competent,” he says, “but that we are all peers. And we’re not. There was once a time when saying that would have been considered unremarkable.”

Along the way, The Death of Expertise dissects the Dunning-Kruger Effect, formulated in 1999, which holds that the less competent people are, the greater the belief they tend to have in their own competence.

Nichols draws from prior cultural studies like Susan Jacoby’s The Age of American Unreason, Robert Hughes’s Culture of Complaint, and Richard Hofstadter’s landmark 1963 work, Anti-Intellectualism in American Life.

There is a chapter on the failures of experts—“like plane crashes, spectacular but rare,” he argues, and a reason to find better experts, not to abandon expertise—and admonitions that experts are the servants and not the masters of democratic society.

The indictments the book levels are numerous: misguided egalitarianism run amok; the “protective, swaddling environment” of higher education, whose institutions increasingly treat students as customers to be kept satisfied; the 24-hour news cycle and the pressure on journalists to entertain rather than inform; the chaotic fusion of news and punditry and citizen participation.

“People cannot accept ever being at a disadvantage in a conversation with anybody else,” he says. “It’s a persistent insecurity that goads people into having to say that they know something even when they don’t. Which didn’t used to be the case—we used to be a much more reasonable culture. You know, everybody doesn’t have to know everything.” 

At the bottom of all of it, Nichols finds “a growing wave of narcissism.” Voters increasingly see political figures as extensions of themselves—“He’s just like me!”—imagining shared personalities and values. Narcissism elevates feelings above facts, and it breeds social resentment, a major driver, Nichols believes, of the revolt against expertise.

“People have just gotten used to remarkable ease,” he says. “They look around and say, ‘How hard could this be?’ You know? ‘How hard can it be?’…That idea is totally animating our political life right now. People say, ‘We’ll elect Donald Trump and he’ll just put in a bunch of guys. We don’t need those experts. That’s the swamp. Because, really, how hard can any of this be?’”

How does it end? This turn away from expertise, this willfully inexpert presidential administration, this age of ignorance and unreason. He doesn’t know. He hopes the answer is not disaster:

“This idea that we don’t really need experts, that everyone knows as much as the experts, it’s the kind of illusion that we can indulge ourselves in until something terrible happens. Everybody wants to second-guess their doctor until their fever hits 104. And then suddenly—I mean, you don’t see a lot of people in emergency rooms arguing with the doctor.

“If I have a slogan about the past year in politics, it’s something I stole from the old Barry Goldwater bumper sticker: ‘In your heart, you know he’s right.’ Even the people who resist my argument, in their hearts, they know they’re wrong. People who say, ‘I don’t have to listen to my doctor’—deep down you know you should. The people who say that Donald Trump is right and experts are idiots—deep down you know you’re wrong about that.

In truth, though, Nichols really is worried. A year after the book’s publication, he finds himself even more pessimistic than he was when he wrote it.

“In the longer term, I’m worried about the end of the republic,” he answered. Immense cynicism among the voting public—incited in part by the White House—combined with “staggering” ignorance, he said, is incredibly dangerous. In that environment, anything is possible. “When people have almost no political literacy, you cannot sustain the practices that sustain a democratic republic.”

On the last day of class, he and the students returned to a question they’d begun the semester with: what are nuclear weapons for? War? Deterrence? History has strangely failed to nail down an answer, Nichols said. In the early days after Hiroshima and Nagasaki, some feared nuclear attacks would become a regular part of warfare. But no nation since then has dropped a nuclear bomb.

that’s his point: something held. “In the end, it boiled down to a very human question: is there anything worth doing this over?”

In The Death of Expertise, Nichols writes about the role of experience in expertise. He describes a Sovietologist at Columbia who could divine hidden policy positions from the featureless sameness of the Soviet press. It seemed like sorcery, but it wasn’t; it was years of practice, skill honed to second nature, a certain kind of intimacy.

Nichols had told similar stories about the Cold Warriors, who in one administration after another were responsible for nuclear diplomacy; knowledge and experience about the scale and scope of consequences lent real seriousness to their approach, Nichols said. Today, he said, “I think we’ve forgotten the horribleness of the decision we were contemplating.” However clinically they discussed their options, he added, Cold War officials understood that they were talking about the end of civilization. 

approach this question with real seriousness. Because that is part of what I think has kept the peace with nuclear weapons for so long. It’s not just a strategic issue; there is embedded in nuclear weapons a kind of different moral calculus.” And that, too, requires expertise.

they have different incentives than he does. Conservative talkers answer to their conservative audience, which, according to polls, remains more skeptical than Democrats of government restrictions on movement. Trump must worry about public opinion as a whole, which strongly favors government-imposed social distancing

Trump must also balance his habitual suspicion of government experts against the fact that Americans trust those experts—in particular, National Institute of Allergy and Infectious Diseases Director Anthony Fauci—far more than they trust him in the battle against COVID-19.

Over the past week, this populist distrust of scientific experts has suffused conservative talk radio’s downplaying of the COVID-19 threat. “The ‘experts’ are routinely wrong on issues big and small—on wearing masks, on reusable grocery bags … virus modeling and treatments,” Ingraham tweeted on April 3. “So when experts issue edicts, remember their often spectacular record of failure.” On April 1, Beck urged politicians “to stop relying on flawed modeling data to make these decisions” and instead “listen to the people in your local communities.

pulists attack economic elites; right-wing populists attack cultural elites

In recent years, as progressives have championed the scientific consensus that climate change poses a grave danger, many conservatives have come to see scientists as yet another collection of snobs using the veneer of expertise to impose its liberal ideology on the country.

A 2019 Pew Research Center poll found that while a large majority of Democrats believed that scientists were better than other people “at making good policy decisions about scientific issues,” a large majority of Republicans disagreed.

Conservative talk radio, by contrast, is built on distrust of experts. Left-wing populists attack economic elites; right-wing populists attack cultural elites

On April 5, Levin warned that “the media, ‘experts,’ and Democrats are trying to make it impossible for the president to even consider rational options for opening parts of the economy.” On April 3, Ingraham declared, “The ‘experts’ aren’t capable of thinking beyond the virus to an even worse death spiral affecting millions of lives here and abroad.”

for conservative talkers, the prospect that Americans without elite credentials have discovered a cure that has eluded scientific elites is part of what makes hydroxychloroquine so enticing. “I don’t think you need to have 12 years of residency or whatever,” Limbaugh declared

Limbaugh, Ingraham, Levin, and Beck are trying to balance their loyalty to Trump with their distrust of credentialed experts, especially those venerated by the mainstream media. That, so far, they’re largely choosing the latter suggests that liberals may be overestimating Trump’s influence.

Ventilation systems in schools, nursing homes, residences and businesses may need to minimize recirculating air and add powerful new filters.

in an open letter to the W.H.O., 239 scientists in 32 countries have outlined the evidence showing that smaller particles can infect people, and are calling for the agency to revise its recommendations

Whether carried aloft by large droplets that zoom through the air after a sneeze, or by much smaller exhaled droplets that may glide the length of a room, these experts said, the coronavirus is borne through air and can infect people when inhaled

But the infection prevention and control committee in particular, experts said, is bound by a rigid and overly medicalized view of scientific evidence, is slow and risk-averse in updating its guidance and allows a few conservative voices to shout down dissent.

“If we started revisiting airflow, we would have to be prepared to change a lot of what we do,” she said. “I think it’s a good idea, a very good idea, but it will cause an enormous shudder through the infection control society.”

In early April, a group of 36 experts on air quality and aerosols urged the W.H.O. to consider the growing evidence on airborne transmission of the coronavirus. The agency responded promptly, calling Lidia Morawska, the group’s leader and a longtime W.H.O. consultant, to arrange a meeting.

But the discussion was dominated by a few experts who are staunch supporters of handwashing and felt it must be emphasized over aerosols, according to some participants, and the committee’s advice remained unchanged.

Dr. Morawska and others pointed to several incidents that indicate airborne transmission of the virus, particularly in poorly ventilated and crowded indoor spaces. They said the W.H.O. was making an artificial distinction between tiny aerosols and larger droplets, even though infected people produce both.

We’ve known since 1946 that coughing and talking generate aerosols,

Scientists have not been able to grow the coronavirus from aerosols in the lab.

Most of the samples in those experiments have come from hospital rooms with good air flow that would dilute viral levels.

In most buildings, she said, “the air-exchange rate is usually much lower, allowing virus to accumulate in the air and pose a greater risk.”

The W.H.O. also is relying on a dated definition of airborne transmission, Dr. Marr said. The agency believes an airborne pathogen, like the measles virus, has to be highly infectious and to travel long distances.

“We have this notion that airborne transmission means droplets hanging in the air capable of infecting you many hours later, drifting down streets, through letter boxes and finding their way into homes everywhere,”

Experts all agree that the coronavirus does not behave that way.

Dr. Marr and others said the coronavirus seemed to be most infectious when people were in prolonged contact at close range, especially indoors, and even more so in superspreader events — exactly what scientists would expect from aerosol transmission.

The agency lagged behind most of its member nations in endorsing face coverings for the public. While other organizations, including the C.D.C., have long since acknowledged the importance of transmission by people without symptoms, the W.H.O. still maintains that asymptomatic transmission is rare.

Many experts said the W.H.O. should embrace what some called a “precautionary principle” and others called “needs and values” — the idea that even without definitive evidence, the agency should assume the worst of the virus, apply common sense and recommend the best protection possible.

“There is no incontrovertible proof that SARS-CoV-2 travels or is transmitted significantly by aerosols, but there is absolutely no evidence that it’s not,

So at the moment we have to make a decision in the face of uncertainty, and my goodness, it’s going to be a disastrous decision if we get it wrong,” she said. “So why not just mask up for a few weeks, just in case?”

he agency also must consider the needs of all its member nations, including those with limited resources, and make sure its recommendations are tempered by “availability, feasibility, compliance, resource implications,” she said.

if the W.H.O. were to push for rigorous control measures in the absence of proof, hospitals in low- and middle-income countries may be forced to divert scarce resources from other crucial programs.

That’s the balance that an organization like the W.H.O. has to achieve,” he said. “It’s the easiest thing in the world to say, ‘We’ve got to follow the precautionary principle,’ and ignore the opportunity costs of that.”

In interviews, other scientists criticized this view as paternalistic. “‘We’re not going to say what we really think, because we think you can’t deal with it?’ I don’t think that’s right,”

Even cloth masks, if worn by everyone, can significantly reduce transmission, and the W.H.O. should say so clearly, he added.

The W.H.O. tends to describe “an absence of evidence as evidence of absence,” Dr. Aldis added. In April, for example, the W.H.O. said, “There is currently no evidence that people who have recovered from Covid-19 and have antibodies are protected from a second infection.”

The statement was intended to indicate uncertainty, but the phrasing stoked unease among the public and earned rebukes from several experts and journalists. The W.H.O. later walked back its comments.

In a less public instance, the W.H.O. said there was “no evidence to suggest” that people with H.I.V. were at increased risk from the coronavirus. After Joseph Amon, the director of global health at Drexel University in Philadelphia who has sat on many agency committees, pointed out that the phrasing was misleading, the W.H.O. changed it to say the level of risk was “unknown.”

But W.H.O. staff and some members said the critics did not give its committees enough credit.“Those that may have been frustrated may not be cognizant of how W.H.O. expert committees work, and they work slowly and deliberately,”

They worried that a vaccine would initially elude scientists, that weary citizens would abandon restrictions despite the risks, that the virus would be with us from now on.

Most experts believed that once the crisis was over, the nation and its economy would revive quickly. But there would be no escaping a period of intense pain.

Exactly how the pandemic will end depends in part on medical advances still to come. It will also depend on how individual Americans behave in the interim. If we scrupulously protect ourselves and our loved ones, more of us will live. If we underestimate the virus, it will find us.

More Americans may die than the White House admits.

The epidemiological model often cited by the White House, which was produced by the University of Washington’s Institute for Health Metrics and Evaluation, originally predicted 100,000 to 240,000 deaths by midsummer. Now that figure is 60,000.

The institute’s projection runs through Aug. 4, describing only the first wave of this epidemic. Without a vaccine, the virus is expected to circulate for years, and the death tally will rise over time.

Fatality rates depend heavily on how overwhelmed hospitals get and what percentage of cases are tested. China’s estimated death rate was 17 percent in the first week of January, when Wuhan was in chaos, according to a Center for Evidence-Based Medicine report, but only 0.7 percent by late February.

Various experts consulted by the Centers for Disease Control and Prevention in March predicted that the virus eventually could reach 48 percent to 65 percent of all Americans, with a fatality rate just under 1 percent, and would kill up to 1.7 million of them if nothing were done to stop the spread.

A model by researchers at Imperial College London cited by the president on March 30 predicted 2.2 million deaths in the United States by September under the same circumstances.

China has officially reported about 83,000 cases and 4,632 deaths, which is a fatality rate of over 5 percent. The Trump administration has questioned the figures but has not produced more accurate ones.

The tighter the restrictions, experts say, the fewer the deaths and the longer the periods between lockdowns. Most models assume states will eventually do widespread temperature checks, rapid testing and contact tracing, as is routine in Asia.

In this country, hospitals in several cities, including New York, came to the brink of chaos.

Only when tens of thousands of antibody tests are done will we know how many silent carriers there may be in the United States. The C.D.C. has suggested it might be 25 percent of those who test positive. Researchers in Iceland said it might be double that.

China is also revising its own estimates. In February, a major study concluded that only 1 percent of cases in Wuhan were asymptomatic. New research says perhaps 60 percent were.

The virus may also be mutating to cause fewer symptoms. In the movies, viruses become more deadly. In reality, they usually become less so, because asymptomatic strains reach more hosts. Even the 1918 Spanish flu virus eventually faded into the seasonal H1N1 flu.

The lockdowns will end, but haltingly.

it is likely a safe bet that at least 300 million of us are still vulnerable.

Until a vaccine or another protective measure emerges, there is no scenario, epidemiologists agreed, in which it is safe for that many people to suddenly come out of hiding. If Americans pour back out in force, all will appear quiet for perhaps three weeks.

The gains to date were achieved only by shutting down the country, a situation that cannot continue indefinitely. The White House’s “phased” plan for reopening will surely raise the death toll no matter how carefully it is executed.

Every epidemiological model envisions something like the dance

On the models, the curves of rising and falling deaths resemble a row of shark teeth.

Surges are inevitable, the models predict, even when stadiums, churches, theaters, bars and restaurants remain closed, all travelers from abroad are quarantined for 14 days, and domestic travel is tightly restricted to prevent high-intensity areas from reinfecting low-intensity ones.

In his wildly popular March 19 article in Medium, “Coronavirus: The Hammer and the Dance,” Tomas Pueyo correctly predicted the national lockdown, which he called the hammer, and said it would lead to a new phase, which he called the dance, in which essential parts of the economy could reopen, including some schools and some factories with skeleton crews.

Even the “Opening Up America Again” guidelines Mr. Trump issued on Thursday have three levels of social distancing, and recommend that vulnerable Americans stay hidden. The plan endorses testing, isolation and contact tracing — but does not specify how these measures will be paid for, or how long it will take to put them in place.

On Friday, none of that stopped the president from contradicting his own message by sending out tweets encouraging protesters in Michigan, Minnesota and Virginia to fight their states’ shutdowns.

China did not allow Wuhan, Nanjing or other cities to reopen until intensive surveillance found zero new cases for 14 straight days, the virus’s incubation period.

Compared with China or Italy, the United States is still a playground.Americans can take domestic flights, drive where they want, and roam streets and parks. Despite restrictions, everyone seems to know someone discreetly arranging play dates for children, holding backyard barbecues or meeting people on dating apps.

Even with rigorous measures, Asian countries have had trouble keeping the virus under control

But if too many people get infected at once, new lockdowns will become inevitable. To avoid that, widespread testing will be imperative.

Reopening requires declining cases for 14 days, the tracing of 90 percent of contacts, an end to health care worker infections, recuperation places for mild cases and many other hard-to-reach goals.

Immunity will become a societal advantage.

Imagine an America divided into two classes: those who have recovered from infection with the coronavirus and presumably have some immunity to it; and those who are still vulnerable.

“It will be a frightening schism,” Dr. David Nabarro, a World Health Organization special envoy on Covid-19, predicted. “Those with antibodies will be able to travel and work, and the rest will be discriminated against.”

Soon the government will have to invent a way to certify who is truly immune. A test for IgG antibodies, which are produced once immunity is established, would make sense

Dr. Fauci has said the White House was discussing certificates like those proposed in Germany. China uses cellphone QR codes linked to the owner’s personal details so others cannot borrow them.

As Americans stuck in lockdown see their immune neighbors resuming their lives and perhaps even taking the jobs they lost, it is not hard to imagine the enormous temptation to join them through self-infection

My daughter, who is a Harvard economist, keeps telling me her age group needs to have Covid-19 parties to develop immunity and keep the economy going,”

It would be a gamble for American youth, too. The obese and immunocompromised are clearly at risk, but even slim, healthy young Americans have died of Covid-19.

The virus can be kept in check, but only with expanded resources.

Resolve to Save Lives, a public health advocacy group run by Dr. Thomas R. Frieden, the former director of the C.D.C., has published detailed and strict criteria for when the economy can reopen and when it must be closed.

once a national baseline of hundreds of thousands of daily tests is established across the nation, any viral spread can be spotted when the percentage of positive results rises.

To keep the virus in check, several experts insisted, the country also must start isolating all the ill — including mild cases.

“If I was forced to select only one intervention, it would be the rapid isolation of all cases,”

In China, anyone testing positive, no matter how mild their symptoms, was required to immediately enter an infirmary-style hospital — often set up in a gymnasium or community center outfitted with oxygen tanks and CT scanners.

There, they recuperated under the eyes of nurses. That reduced the risk to families, and being with other victims relieved some patients’ fears.

Still, experts were divided on the idea of such wards

Ultimately, suppressing a virus requires testing all the contacts of every known case. But the United States is far short of that goal.

In China’s Sichuan Province, for example, each known case had an average of 45 contacts.

The C.D.C. has about 600 contact tracers and, until recently, state and local health departments employed about 1,600, mostly for tracing syphilis and tuberculosis cases.

China hired and trained 9,000 in Wuhan alone. Dr. Frieden recently estimated that the United States will need at least 300,000.

There will not be a vaccine soon.

any effort to make a vaccine will take at least a year to 18 months.

the record is four years, for the mumps vaccine.

for unclear reasons, some previous vaccine candidates against coronaviruses like SARS have triggered “antibody-dependent enhancement,” which makes recipients more susceptible to infection, rather than less. In the past, vaccines against H.I.V. and dengue have unexpectedly done the same.

A new vaccine is usually first tested in fewer than 100 young, healthy volunteers. If it appears safe and produces antibodies, thousands more volunteers — in this case, probably front-line workers at the highest risk — will get either it or a placebo in what is called a Phase 3 trial.

It is possible to speed up that process with “challenge trials.” Scientists vaccinate small numbers of volunteers, wait until they develop antibodies, and then “challenge” them with a deliberate infection to see if the vaccine protects them.

Normally, it is ethically unthinkable to challenge subjects with a disease with no cure, such as Covid-19.

“Fewer get harmed if you do a challenge trial in a few people than if you do a Phase 3 trial in thousands,” said Dr. Lipsitch, who recently published a paper advocating challenge trials in the Journal of Infectious Diseases. Almost immediately, he said, he heard from volunteers.

The hidden danger of challenge trials, vaccinologists explained, is that they recruit too few volunteers to show whether a vaccine creates enhancement, since it may be a rare but dangerous problem.

if a vaccine is invented, the United States could need 300 million doses — or 600 million if two shots are required. And just as many syringes.

“People have to start thinking big,” Dr. Douglas said. “With that volume, you’ve got to start cranking it out pretty soon.”

Treatments are likely to arrive first.

The modern alternative is monoclonal antibodies. These treatment regimens, which recently came very close to conquering the Ebola epidemic in eastern Congo, are the most likely short-term game changer, experts said.

as with vaccines, growing and purifying monoclonal antibodies takes time. In theory, with enough production, they could be used not just to save lives but to protect front-line workers.

Having a daily preventive pill would be an even better solution, because pills can be synthesized in factories far faster than vaccines or antibodies can be grown and purified.

Goodbye, ‘America First.’

A public health crisis of this magnitude requires international cooperation on a scale not seen in decades. Yet Mr. Trump is moving to defund the W.H.O., the only organization capable of coordinating such a response.

And he spent most of this year antagonizing China, which now has the world’s most powerful functioning economy and may become the dominant supplier of drugs and vaccines. China has used the pandemic to extend its global influence, and says it has sent medical gear and equipment to nearly 120 countries.

This is not a world in which “America First” is a viable strategy, several experts noted.

“If President Trump cares about stepping up the public health efforts here, he should look for avenues to collaborate with China and stop the insults,”

If we alienate the Chinese with our rhetoric, I think it will come back to bite us,” he said.“What if they come up with the first vaccine? They have a choice about who they sell it to. Are we top of the list? Why would we be?”

Once the pandemic has passed, the national recovery may be swift. The economy rebounded after both world wars, Dr. Mulder noted.

In one of the most provocative analyses in his follow-up article, “Coronavirus: Out of Many, One,” Mr. Pueyo analyzed Medicare and census data on age and obesity in states that recently resisted shutdowns and counties that voted Republican in 2016.

He calculated that those voters could be 30 percent more likely to die of the virus.

In the periods after both wars, Dr. Mulder noted, society and incomes became more equal. Funds created for veterans’ and widows’ pensions led to social safety nets, measures like the G.I. Bill and V.A. home loans were adopted, unions grew stronger, and tax benefits for the wealthy withered.

If a vaccine saves lives, many Americans may become less suspicious of conventional medicine and more accepting of science in general — including climate change

And the newfound optimism comes with three big caveats: The worst may be over if too many people don't let down their guard too fast, if the more dangerous variants don't make cases surge before enough people get vaccinated, and if the vaccination campaign doesn't stumble badly.

But if none of those problems occurs, life could slowly but steadily return to something much more normal.The optimism is based on the rapid ramp-up of the vaccination campaign combined with the fact that a significant proportion of the country already has some immunity from being exposed to the virus, and the warmer weather that is linked to slower viral spread.

Now, not everyone is quite ready to say the worst might be over. Several experts worry about the more contagious variants combining with too many communities lifting mask mandates and other restrictions and too many people letting down their guard, especially over spring break and Easter.

In fact, new hot spots look like they could already be emerging, especially in Michigan and other parts of the Midwest, and in the Northeast, especially New York City and New Jersey.But while most experts agree that combination of factors is the big sword of Damocles hanging over the nation's hopes, most think that the country could avoid another big surge such as the one that occurred over the winter.

this spring, as more people are vaccinated, more people may be able to return safely to stores, restaurants and work, more children could return to in-person learning, and small groups of fully vaccinated people getting together for dinner parties indoors without masks.

the Centers for Disease Control and Prevention recently issued guidelines that say vaccinated people can already start to get together that way.And if case counts continue to decline and vaccination rates increase, many public health authorities think the summer could be even better.

Americans still need to be careful: Hot spots could flare up due to the variants, people getting careless, triggering superspreader events, and among pockets of people who haven't gotten vaccinated.

By the fall, while young children still won't be vaccinated because scientists have just started testing the vaccines on them, their teachers hopefully will be. So in places where infections are low, schools should be pretty safe, experts told NPR.Students will probably still wear masks and may still need to keep their distance from one another. But hopefully no more slogging through school on laptops at the kitchen table for most kids.

Researchers such as Fauci hope that more aspects of our day-to-day lives could edge back closer to pre-pandemic times.

Some experts worry the virus could follow a seasonal pattern like the flu and surge again in the late fall or early winter. And that threat may be even greater because of the variants, especially the strains originally spotted in South Africa and Brazil that appear to be better at evading natural immunity and the vaccines.

The vaccine works against the U.K. variant, says Mokdad of the University of Washington, so with more vaccination, other variants may become dominant. "And by winter we assume these two will become the dominant one unless we have more that show up. And they will cause more infections and more mortality."But even if there is no new winter surge, the virus won't be gone. It just hopefully won't be causing anything like the suffering that's already occurred.

It could, however, still be causing significant problems in parts of the world that haven't gotten vaccinated, which could spawn new, even more dangerous variants that could travel to the United States.As a result, the country will probably need new versions of the vaccines for the variants and booster shots. And many experts say it's crucial that the U.S. help the rest of the world vaccinate as quickly as possible, too.

But even if the country is on the road out of this, the impact has been tremendous, and the aftereffects are likely to be long-lasting, many experts say.

The pandemic revealed some deep problems, such as how society treats older people, poor people and people of color.

It could change so many parts of our lives. Our homes. Our work. Travel. How we touch each other. Will the the elbow bump replace the handshake for good?

The Black Death led to the Renaissance. The 1918-19 flu pandemic gave way to the roaring 20s. We've just begun the new 20s. It's impossible to know what world will emerge as the virus recedes. But it seems pretty clear we'll be hearing the echoes of this pandemic for a long time.

The great theme of the Trump years, the one historians will note a century from now, was the failure of America’s expert class. The people who were supposed to know what they were talking about, didn’t. 

When intellectuals and journalists of the left use the word “democracy,” they typically are not referring to elections and decision-making by popularly elected officials

For the left, “democracy” is another word for progressive policy aims, especially the widening of special political rights and welfare-state provisions to new constituencies. By that definition any Republican president is carrying out an “assault on democracy.”

Mr. Trump assaulted democracy in the ordinary sense of the word, but he did so only after the 2020 election. That effort was discreditable and disruptive, but it was also delusional and ineffective. It was not the assault the president’s expert-class critics had foreseen.

It took a 22-month investigation by a special counsel to establish an absence of evidence that Mr. Trump’s campaign had conspired with the Russians.

Reporters treated every turn of events as evidence of Mr. Trump’s unique evil.

Reports of his defeat, accurate though they were, meant little coming from news organizations that cared so much about discrediting him and so little about factual truth.

Meanwhile the administration pressed ahead with a diplomatic push to strike commercial and diplomatic deals between Israel and Arab states

political talking points aside, this much is apparent: No nation—or anyhow no nation that values individual liberty and isn’t an island—has managed even to slow the spread of Covid-19 without causing economic ruin and attendant disorder.

The Trump administration made its share of mistakes during the early stages of the pandemic, although its chief failing was the president’s lack of rhetorical clarity

By any set of criteria outside the self-contained system of public-health best practices, the lockdowns failed. They purchased minor slowdowns in the spread of the virus at the cost of punishing economic destruction, untold social dysfunction, and mind-blowing public debt. 

many parts of the country didn’t lock down, or did so only loosely and briefly, and managed to keep their hospitals running just fine.

Controlling the spread of Covid-19 in the U.S. was always going to be a messy business: Many infected people don’t get sick and have no compelling reason to burrow in their homes, and America is an unruly nation with a long tradition of nonconformity

The experts might have accounted for these realities. They might have realized that the measures prescribed by their textbooks—contact tracing, forced quarantines, shelter-in-place orders—were mostly unworkable in America. They didn’t.

If this was an attempted coup, it was a comically inept one. Hardly anyone in Mr. Trump’s own administration, including the vice president, wanted anything to do with it.  

The most regrettable part of this class failure is that, with rare exceptions, the experts themselves acknowledge no error. Nothing about the Trump years has occasioned soul-searching or self-criticism on their part

“The window of opportunity is still there, but the window of opportunity is narrowing,” WHO Director General Tedros Adhanom Ghebreyesus said on Friday. “We need to act quickly before it closes completely.”

At the beginning of any disease outbreak, public health experts painstakingly trace the contacts of every person who becomes sick. The experts build a family tree of possible illness, with branches that include anyone who might have shaken hands with, or been sneezed on by an infected person

with confirmed infections approaching 80,000 people, contact tracing on a case-by-case basis could soon be impractical.

“What we find is that this virus is going to be very difficult to contain,” said Jeffrey Shaman, an infectious disease researcher at Columbia University and co-author of the study posted Monday. “Personally, I don’t think we can do it.”

The word ‘pandemic’ invokes fear, but it describes how widespread an outbreak may be, not its deadliness.

“I think we should assume that this virus is very soon going to be spreading in communities here, if it isn’t already, and despite aggressive actions, we should be putting more efforts to mitigate impacts,”

The virus would be easier to contain if people who are contagious were obviously so, as was the case with SARS, which started an outbreak that burned itself out in 2003. But the new virus appears to spread among people who in some cases are not noticeably sick.

among the more than 600 passengers from the Diamond Princess cruise ship who have tested positive, about half had no obvious symptoms.

If the coronavirus becomes a true pandemic, a large proportion of the human population — a third, a half, two-thirds even — could become infected

Harvard epidemiologist Marc Lipsitch estimates that 40 to 70 percent of the human population could potentially be infected by the virus if it becomes pandemic. Not all of those people would get sick

The novel coronavirus may be particularly suited for stealth community transmission since its symptoms can be indistinguishable from those of a cold or flu, and testing capabilities are still being ramped up.

Experts estimate it takes about a week for the number of people infected in a given community to double. Based on that, it would likely take several weeks for a new infection cluster to be picked up by a local health department

By mid-March, he estimated, officials should know if there is community transmission and a true pandemic.

“I want to be clear that we are not seeing community spread here in the United States yet,” she said Friday. “But it’s very possible, even likely, that may eventually happen.”

“If a large number of countries are unsuccessful in preventing sustained multi-generation transmissions, then we could witness the next pandemic.”

A pandemic is a line in the sand, and every expert has a slightly different definition for when an outbreak crosses it. Generally, it means that there are self-sustaining lines of infection in multiple countries and continents — where the family tree of possible illness begins to encompass the entire population.

I think we’re not in as dire straits as we might be, and that’s because everyone is pulling together internationally.”

Public health experts are devising strategies on how to conserve N95 respirators, specialized masks that are in a limited supply amid surging demand.

“Extrapolating from some of the numbers we’ve seen on the impact to the health care system in China, it means we’ll have to surge fast.”

There are five weeks to go until Election Day, but almost a million ballots have already been cast in this election, according to Michael McDonald, a turnout expert at the University of Florida who runs the U.S. Election Project, which tracks voting. That’s up from less than 10,000 early votes cast at this time four years ago.

President Trump has baselessly claimed that widespread voter fraud is rampant in both in-person and mail voting systems, without providing any evidence. His challenger, former Vice President Joe Biden, has accused Trump of eroding confidence in U.S. democracy, and has stoked fears about whether Trump will actually leave office if voted out.

There are five weeks to go until Election Day, but almost a million ballots have already been cast in this election, according to Michael McDonald, a turnout expert at the University of Florida who runs the U.S. Election Project, which tracks voting. That’s up from less than 10,000 early votes cast at this time four years ago.

“We don’t expect Chris or our other moderators to be fact-checkers.”

of the election, a subject on which the two candidates have divergent views. President Trump has baselessly claimed that widespread voter fraud is rampant in both in-person and mail voting systems, without providing any evidence. His challenger, former Vice President Joe Biden, has accused Trump of eroding confidence in U.S. democracy, and has stoked fears about whether Trump will actually leave office if voted out.

President Trump has baselessly claimed that widespread voter fraud is rampant in both in-person and mail voting systems, without providing any evidence. His challenger, former Vice President Joe Biden, has accused Trump of eroding confidence in U.S. democracy, and has stoked fears about whether Trump will actually leave office if voted out.

President Trump has baselessly claimed that widespread voter fraud is rampant in both in-person and mail voting systems, without providing any evidence. His challenger, former Vice President Joe Biden, has accused Trump of eroding confidence in U.S. democracy, and has stoked fears about whether Trump will actually leave office if voted out.

There are five weeks to go until Election Day, but almost a million ballots have already been cast in this election, according to Michael McDonald, a turnout expert at the University of Florida who runs the U.S. Election Project, which tracks voting. That’s up from less than 10,000 early votes cast at this time four years ago.

“We don’t expect Chris or our other moderators to be fact-checkers.”

Trump’s and Biden’s records The Supreme Court: This issue has gained new importance with the announcement of Trump’s nominee to replace Justice Ruth Bader Ginsburg. COVID-19: Daily cases are on the rise in nearly half of U.S. states. The economy: Expect this to be closely tied to the pandemic. Race and violence in U.S. cities: The framing of this topic has drawn criticism, but protests against racism and police brutality are ongoing around the country. The integrity of the election: See the latest on election security from NPR here.

Trump’s and Biden’s records The Supreme Court: This issue has gained new importance with the announcement of Trump’s nominee to replace Justice Ruth Bader Ginsburg. COVID-19: Daily cases are on the rise in nearly half of U.S. states. The economy: Expect this to be closely tied to the pandemic. Race and violence in U.S. cities: The framing of this topic has drawn criticism, but protests against racism and police brutality are ongoing around the country. The integrity of the election: See the latest on election security from NPR here.

Biden’s 2019 tax return shows taxable income of $944,737 and a federal tax bill of $299,346. Harris and her husband, Doug Emhoff, reported $3,018,127 in taxable income and paid $1,185,628 in taxes.

Biden’s 2019 tax return shows taxable income of $944,737 and a federal tax bill of $299,346. Harris and her husband, Doug Emhoff, reported $3,018,127 in taxable income and paid $1,185,628 in tax

Biden’s 2019 tax return shows taxable income of $944,737 and a federal tax bill of $299,346. Harris and her husband, Doug Emhoff, reported $3,018,127 in taxable income and paid $1,185,628 in taxes.

The New York Times reports that Trump’s tax returns show millions of dollars in losses and that Trump paid only $750 in income taxes in each of 2016 and 2017, and in 10 of the last 15 years paid no income tax at all. The report also raised questions about questionable tax deductions made by Trump that could run afoul of tax law.

The New York Times reports that Trump’s tax returns show millions of dollars in losses and that Trump paid only $750 in income taxes in each of 2016 and 2017, and in 10 of the last 15 years paid no income tax at all. The report also raised questions about questionable tax deductions made by Trump that could run afoul of tax law.

almost a million ballots have already been cast in this election, according to Michael McDonald, a turnout expert at the University of Florida who runs the U.S. Election Project, which tracks voting. That’s up from less than 10,000 early votes cast at this time four years ago.

There are five weeks to go until Election Day, but almost a million ballots have already been cast in this election, according to Michael McDonald, a turnout expert at the University of Florida who runs the U.S. Election Project, which tracks voting. That’s up from less than 10,000 early votes cast at this time four years ago.

This concerted attack on professionalism made it easier for Trump and Boris Johnson to claim that they might just know better than leading scientists. Business leaders are praised as more capable decision-makers, when it comes to the length of a lockdown, than epidemiologists. Trump – who apparently listens to theories cooked up by his uniquely unqualified son-in-law and fears being upstaged by Anthony Fauci – has still not understood that the longer amateur hour at the very top lasts, the more lives will be lost.

The lesson is not that professionalism should replace democratic politics, or, for that matter, widespread participation by citizens – a conclusion drawn by unashamedly elitist liberals who have sought to reinstate professional gatekeepers everywhere, but especially in primaries. Citizens still know best what their problems are; professionals – in perfectly non-condescending ways – play a crucial role in addressing them. Or, as John Dewey, the greatest American philosopher of democracy in the 20th century, put it, “no government by experts in which the masses do not have the chance to inform the experts as to their needs can be anything but an oligarchy managed in the interests of the few.”

Try to avoid exchanging money or credit cards with the cashier. Use a credit-card reader when possible.

all Americans to wear cloth face masks when out in public, which includes when in the grocery store.

wash your hands with soap and water before going out and when coming home, and use hand sanitizer when out.

If you use gloves, choose disposable ones and throw them before getting into your car or as soon as you get home

Try not to use your phone when in the store. If you do, clean it when you get home.

it’s a good idea to bring your own, mainly to wipe the grocery cart

Wipes can also be used for other high-touch areas in the store like freezer handles or tongs used in self-serve bins.

To be extra cautious, you could heat food in the oven or microwave, though this hasn’t been specifically studied so it’s unclear if there’s a particular length of time needed.

People over 65 and those who have medical conditions that put them at greater risk of hospitalization and serious illness should avoid going to the grocery store, if possible. Try to order groceries online or have a family member or friend deliver them while taking precautions.

Though there have been no documented cases of transmission of the novel coronavirus through food packaging, a recent NEJM study found that the virus can live on cardboard for up to 24 hours and on hard surfaces such as plastic and stainless steel for two to three days.

use self-checkout when possible and use hand sanitizer when you’re done.

experts say wiping down cereal boxes and other packages isn’t necessary. “Use the wipes when you need them,” says Dr. Chapman. If you’re home you can easily wash your hands. “That’s going to reduce your risk as much if not more than trying to wipe everything down,” he says.

instead of being preoccupied with wiping down packaging and containers, focus on washing your hands. “It’s much better to treat your hands, wash your hands, rather than dealing with all the surfaces,”

Your mouth is a gateway to both your respiratory system (your lungs) and your digestive system (stomach). Respiratory viruses like the novel coronavirus are believed to enter the body and reproduce through the respiratory tract, not the digestive tract.

Experts say it is possible that if the virus rubs off from any object to the inside of your mouth, it could infect you if it goes into your respiratory system. But there doesn’t appear to be any risk of infection via your digestive trac

doctors say getting the virus through ingestion of contaminated food seems unlikely. Gregory Poland, director of the Mayo Clinic’s Vaccine Research Group in Rochester, Minn., speculates that the gastric acid in the stomach would kill it. “My own speculation is that the GI route would be very low likelihood compared to known and efficient methods of infection,”

the studies were done in a laboratory with high doses of the virus, so it’s unknown if in real life the virus can be transmitted that way. Most likely if someone were to sneeze or cough on a cardboard container, the virus would degrade more quickly due to environmental factors, such as sunlight.

If you touch virus particles on raw food and then touch your nose, eyes or mouth, that is a potential source of transmission. But experts note that is very unlikely. To be vigilant, thoroughly wash your hands with soap and water, and don’t eat your food with your hands.

Experts urge people not to wash fruits and vegetables with anything but water. The chemicals on wipes and chlorine solutions especially can be dangerous—don’t ingest those.

There’s no evidence that the virus can be transmitted through clothing, but it hasn’t been specifically studied

The good news is it can be killed by doing laundry. So if you were in a grocery store where people near you were coughing, it’s a good idea to remove your clothes when you get home. Don’t shake clothing. Place it in your laundry hamper.

The CDC recommends laundering contaminated clothes in the warmest appropriate water setting and drying them thoroughly.

The CDC says there are no known cases of the novel coronavirus being spread through the fecal-oral route, which is a common route of transmission for stomach viruses like the norovirus.

But a recent study that hasn’t been peer reviewed yet found the virus in the stool of some patients. This route of transmission remains unknown, and experts say it’s unlikely to be contributing significantly to the pandemic.

It was only two weeks ago that the White House got word, in response to its inquiries, that heat and humidity may not cause a decrease in coronavirus cases. After receiving a request from the White House Office of Science and Technology Policy, researchers at the National Academies of Sciences, Medicine and Engineering delivered a report on April 7 indicating a "decrease in cases with increases in humidity and temperature elsewhere should not be assumed."

How each medical expert approaches the situation has differed. Dr. Anthony Fauci, the nation's top infectious disease expert, isn't hesitant to offer unvarnished thoughts or analysis even when it seems to contradict the President. This week, Fauci has offered a message on the potential return of the virus that ran counter to Trump's own, more optimistic projections -- including the President's suggestion that it's "possible it doesn't come back at all." Fauci's message was different: "There will be coronavirus in the fall," he said bluntly, adding later: "I am convinced of that."

The best experts help us find the sweet spot between our gut and our brain by explaining processes, risks, and benefits in ways that we can understand.

Over the summer, hundreds of the same experts who told us not to gather even in small groups—for instance, to sing in a church choir or, more personally, have a small funeral for my brother—made a political exception for gigantic street protests where people held hands and shouted and chanted together.

Early inconstancy about masks and transmissibility confused even well-meaning people who just wanted to know the right answer

we must consider whether we are asking questions that are meaningful and intended to help us reach a decision, or whether we are asking questions to enjoy a temporary sense of empowerment.

We should focus on useful inquiries that are guides to action: Do these vaccines have side effects? If I need two shots, how long can I wait between getting them? How long will immunity last? What can I do after I’m vaccinated?

Sometimes, experts and their institutions fail. But people who believe that medical schools, research institutions, peer review, and lab trials—in other words, the entire structure of modern science—have all failed or become corrupted are beyond the reach of reason, and no expert advice will sway them

We are capable of being serious adults who understand, if we choose to try, and accept that in every crisis, risks and imperfect solutions exist, while still maintaining our faith in expertise and its achievements.

I once worked with a U.S. Navy captain who commanded one of America’s most advanced nuclear submarines. He told me of the wondrous experience of surfacing in the North Atlantic in the middle of the night and standing on top of the conning tower just above the waves, nothing but sea and stars before him in the pitch blackness. He thought it was ecstasy; I became anxious merely imagining it.I asked how he overcame the sense of helplessness and isolation that I felt just hearing his description of the experience. He seemed slightly amused at the question. “You just have to have faith in all that technology under your feet.”

What he meant was that you had to trust that everyone involved in making that submarine had done their job in good faith and to the best of their ability, and that their work was checked and rechecked by people who would want to feel safe putting their own children aboard that tiny sliver of steel in the midst of the great ocean.

I know that dedicated and decent people created such miracles. They have done their part, and I will do mine.

Carlson did not immediately respond to a request for comment.

Unlike Floyd, who is contracted to work only part time for Willis' office, Carlson is being brought into the district attorney's office full time as a staff employee.

In a letter to numerous Georgia state election officials, including Raffensperger, Willis requested that they preserve documents related to Trump's January phone call in which he pushed Raffensperger to "find" votes to reverse his election loss.

The Atlanta-area district attorney investigating former President Donald Trump, Fani Willis, is beefing up her office with a new evidence expert, according to a source familiar with the situation.

Michael Carlson, known as an expert in the rules of evidence, is slated to join the Fulton County District Attorney's Office in the coming weeks. He's expected to work on a variety of issues, from cold cases to capital murder to public integrity investigations.

The single-minded mission of a public health expert is to stop the spread of disease, which is of course an important priority. But if he is not trained in history or economics, he may not realize how relevant these bodies of knowledge are to the general health of society, and he may not appreciate the full costs of drastic public health measures.

Never in history has an economic catastrophe descended so swiftly.  “The speed and magnitude of the labor market’s decline is unprecedented,”

Dr. Fauci dismisses the loss of 10 million jobs as merely “inconvenient”, and says “I just don’t understand” why all 50 states are not locking down their citizens -- perhaps because he does not understand how terrible the last depression was.

Extrapolating from Brenner’s estimates, political scientist Toby Rogers calculates that even a 5 percent increase in unemployment over 5 years (the Great Depression lasted more than a decade) would kill nearly 300,000 Americans

Historically, economic prosperity tends to make human beings tolerant and peace-loving, whereas sharp economic reverses impel us to grab resources from others, persecute scapegoats, surrender to despots, and wage war.

we tend to overlook the darker side of the New Deal. To take just one example which isn’t much taught in our classes, the US government deported as many as 1.8 million Mexican-Americans to Mexico, though the majority were US citizens. The exact numbers are debated, but in any case they were far greater than the Japanese-Americans interned during the Second World War (120,000) or the American Indians removed from their land by Andrew Jackson (80,000). Begun under the Hoover administration, the deportations continued under Roosevelt, with the aim of saving jobs for Americans (as long as they weren’t Mexican-Americans). 

the actual casualties of the Second World War were still greater: 70 to 85 million dead, two-thirds of them civilians, most if not all of them ultimately the result of the Great Depression. Without that trigger, there would have probably been no global war and no Holocaust

even mild recessions can kill. Drawing on American health statistics from 1940 to 1973, he calculated that a one percent rise in unemployment over six years produced 36,887 excess deaths, mainly from cardiovascular disease, suicide, homicide, and cirrhosi

The Great Depression gave rise to tyranny, aggression, and mass murder throughout the world

If unemployment reaches 20 percent, as some economists are predicting, the result would be almost a million deaths in the United States alone, far more than any plausible estimate of COVID casualties.

If you question whether the measures taken against coronavirus today will kill democracy, the answer is that they are already killing democracy.

In Africa, government security forces have been brutalizing and in some cases killing citizens to enforce lockdowns. Throughout the Third World there are hundreds of millions living on a subsistence level, and for them lockdowns can mean starvation:

Lockdowns now look increasingly like an epidemiological Maginot Line, a flatfooted static defense that rules out more aggressive and innovative tactics