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A New York Times investigation in Brazil found that, time and again, videos promoted by the site have upended central elements of daily life

YouTube’s recommendation system is engineered to maximize watchtime, among other factors, the company says, but not to favor any political ideology.

Some parents look to “Dr. YouTube” for health advice but get dangerous misinformation instead, hampering the nation’s efforts to fight diseases like Zika. Viral videos have incited death threats against public health advocates.

And in politics, a wave of right-wing YouTube stars ran for office alongside Mr. Bolsonaro, some winning by historic margins. Most still use the platform, governing the world’s fourth-largest democracy through internet-honed trolling and provocation

Teachers describe classrooms made unruly by students who quote from YouTube conspiracy videos or who, encouraged by right-wing YouTube stars, secretly record their instructors

But the emotions that draw people in — like fear, doubt and anger — are often central features of conspiracy theories, and in particular, experts say, of right-wing extremism

As the system suggests more provocative videos to keep users watching, it can direct them toward extreme content they might otherwise never find. And it is designed to lead users to new topics to pique new interest

The system now drives 70 percent of total time on the platfor

Zeynep Tufekci, a social media scholar, has called it “one of the most powerful radicalizing instruments of the 21st century.”

Danah Boyd, founder of the think tank Data & Society, attributed the disruption in Brazil to YouTube’s unrelenting push for viewer engagement, and the revenues it generates.

Maurício Martins, the local vice president of Mr. Bolsonaro’s party in Niterói, credited “most” of the party’s recruitment to YouTube — including his own.

“Before that, I didn’t have an ideological political background,” Mr. Martins said. YouTube’s auto-playing recommendations, he declared, were “my political education.”

“It was like that with everyone,”

Sometimes I’m watching videos about a game, and all of a sudden it’s a Bolsonaro video,”

More and more, his fellow students are making extremist claims, often citing as evidence YouTube stars like Mr. Moura, the guitarist-turned-conspiracist.

“If social media didn’t exist, I wouldn’t be here,” he said. “Jair Bolsonaro wouldn’t be president.”

In the months after YouTube changed its algorithm, positive mentions of Mr. Bolsonaro ballooned. So did mentions of conspiracy theories that he had floated. This began as polls still showed him to be deeply unpopular, suggesting that the platform was doing more than merely reflecting political trends.

Jonas Kaiser and Yasodara Córdova, with Adrian Rauchfleisch of National Taiwan University, programmed a Brazil-based server to enter a popular channel or search term, then open YouTube’s top recommendations, then follow the recommendations on each of those, and so on.

By repeating this thousands of times, the researchers tracked how the platform moved users from one video to the next. They found that after users watched a video about politics or even entertainment, YouTube’s recommendations often favored right-wing, conspiracy-filled channels like Mr. Moura’s

Crucially, users who watched one far-right channel would often be shown many more.

The algorithm had united once-marginal channels — and then built an audience for them

One of those channels belonged to Mr. Bolsonaro, who had long used the platform to post hoaxes and conspiracies

The conspiracies were not limited to politics. Many Brazilians searching YouTube for health care information found videos that terrified them: some said Zika was being spread by vaccines, or by the insecticides meant to curb the spread of the mosquito-borne disease that has ravaged northeastern Brazi

The videos appeared to rise on the platform in much the same way as extremist political content: by making alarming claims and promising forbidden truths that kept users glued to their screens.

Doctors, social workers and former government officials said the videos had created the foundation of a public health crisis as frightened patients refused vaccines and even anti-Zika insecticides.

Not long after YouTube installed its new recommendation engine, Dr. Santana’s patients began telling him that they’d seen videos blaming Zika on vaccines — and, later, on larvicides. Many refused both.

Medical providers, she said, were competing “every single day” against “Dr. Google and Dr. YouTube” — and they were losing

Brazil’s medical community had reason to feel outmatched. The Harvard researchers found that YouTube’s systems frequently directed users who searched for information on Zika, or even those who watched a reputable video on health issues, toward conspiracy channels

As the far right rose, many of its leading voices had learned to weaponize the conspiracy videos, offering their vast audiences a target: people to blame

Eventually, the YouTube conspiracists turned their spotlight on Debora Diniz, a women’s rights activist whose abortion advocacy had long made her a target of the far right

Bernardo Küster, a YouTube star whose homemade rants had won him 750,000 subscribers and an endorsement from Mr. Bolsonaro, accused her of involvement in the supposed Zika plots.

As far-right and conspiracy channels began citing one another, YouTube’s recommendation system learned to string their videos together

However implausible any individual rumor might be on its own, joined together, they created the impression that dozens of disparate sources were revealing the same terrifying truth.

When the university where Ms. Diniz taught received a warning that a gunman would shoot her and her students, and the police said they could no longer guarantee her safety, she left Brazil.

“The YouTube system of recommending the next video and the next video,” she said, had created “an ecosystem of hate.

“‘I heard here that she’s an enemy of Brazil. I hear in the next one that feminists are changing family values. And the next one I hear that they receive money from abroad” she said. “That loop is what leads someone to say ‘I will do what has to be done.’

In Brazil, this is a growing online practice known as “linchamento” — lynching. Mr. Bolsonaro was an early pioneer, spreading videos in 2012 that falsely accused left-wing academics of plotting to force schools to distribute “gay kits” to convert children to homosexuality.

Mr. Jordy, his tattooed Niterói protégé, was untroubled to learn that his own YouTube campaign, accusing teachers of spreading communism, had turned their lives upside down.One of those teachers, Valeria Borges, said she and her colleagues had been overwhelmed with messages of hate, creating a climate of fear.

Mr. Jordy, far from disputing this, said it had been his goal. “I wanted her to feel fear,” he said

The group’s co-founder, a man-bunned former rock guitarist name Pedro D’Eyrot, said “we have something here that we call the dictatorship of the like.”

Reality, he said, is shaped by whatever message goes most viral.

Even as he spoke, a two-hour YouTube video was captivating the nation. Titled “1964” for the year of Brazil’s military coup, it argued that the takeover had been necessary to save Brazil from communism.Mr. Dominguez, the teenager learning to play guitar, said the video persuaded him that his teachers had fabricated the horrors of military rule.

The attorneys from the Federal Public Ministry say the time has come for Brazilian institutions to account for their role in slavery. They’ve called on Banco do Brasil to commit to some form of reparations.

The attorneys on Friday gave Banco do Brasil 15 days to publicly acknowledge its role in slavery and the slave trade and present plans for some form of reparations.

The bank does not deny its ties to slavery but has argued that it should not be held responsible for the sins of a society. It says it did not commit any crimes and should not be liable for the actions of those who worked for or funded the bank

Brazilians, particularly elites descended from European settlers, have historically preferred to think of their country as free of racism. “A racial democracy,” they boasted, where people could marry independent of skin color and race was defined less rigidly than in the United States.

That story, historians say, has largely obscured the primacy of slavery in Brazil’s genesis — and its enduring impact. Brazil imported around 5 million enslaved Africans — far more than any other country — accounting for roughly 40 percent of the entire trade

Nearly twice as many enslaved people were brought through a single wharf in Rio de Janeiro than arrived in all of the United States. It was the last country in the Americas, in 1888, to abolish slavery.

“Brazil has never had a problem romanticizing its memory of slavery,” said Luciana Brito, a historian at the Federal University of Recôncavo da Bahia. “It likes to remember slavery as a means of producing a beautiful people, of one nation, as though it was a necessary evil.”

Banco do Brasil, which in 2023 reported $380.3 billion in assets and $5.8 billion in profits, according to Forbes. Chartered in 1808 by Portuguese King Dom João, the bank drew its foundational capital from taxes the crown imposed on sea trade, much of which involved slavery. The wealthy Rio elite — many of whom trafficked in enslaved Africans — were invited by the crown to finance the bank.

When the trade was outlawed in 1831, the bank’s ties to slavery didn’t diminish, historians and government attorneys say — they intensified. The bank closed for two decades but reopened in 1853 for the purpose of accumulating ill-gotten wealth, prosecutors and historians allege, most of it from the international slave trade.

“Bring together capital that has found itself displaced from illicit trade and converge it into a center where the productive forces of the country could be fed,” Irineu Evangelista de Sousa, who reopened the bank, wrote in his autobiography. “This was the idea that came into my head.”

The openness with which he spoke of the scheme, historians say, betrays the extent to which the crime of slavery was normalized in elite Brazilian society.

Under pressure from the United Kingdom, Brazil begrudgingly signed on to an international campaign to abolish the international slave trade in 1831. But it did little to enforce it. More than 700,000 enslaved Africans were trafficked into the country until a more restrictive law was passed in 1850.

But that story, and so many others, was virtually unknown to Brazilians, said Thiago Campos, a historian at the Federal Fluminense University. So a group of historians began discussing earlier this year how to start a broader conversation.

Fourteen historians wrote a letter this autumn to government attorneys outlining what they knew of Banco do Brasil’s history and asking for a national debate on the matter. The attorneys with the Federal Public Ministry, who represent Brazilians in cases involving individual or social rights, took it even further: They called for reparations.

“Unfortunately, Brazil is very behind on this discussion,” he said. “I believe it will be likely that as we progress with this case, others will come forward, and we’ll have more discussion on this topic. It’s an important moment to put this on the national agenda.”

If vaccines are the ultimate way out from this global pandemic, Brazil has a long way to go to seeing this through. As of Friday, less than 10 million people in the country of about 220 million had received at least one dose,

Only 1.57% of the population had been fully vaccinated.

That is the result of a slow rollout program that has been plagued by delays. During the announcement of its distribution plan in early February, the government promised some 46 million vaccine doses to be available in March. It's been repeatedly forced to lower that number, now estimating only 26 million by month's end.

In-country production of what the governments says will eventually be hundreds of millions of doses of the Oxford-AstraZeneca vaccine only just got off the ground. The first 500,000 doses were delivered and celebrated by top Ministry of Health officials in Rio de Janeiro this week, despite being months behind schedule.

If vaccines are to remain in short supply for the foreseeable future, the only remaining ways to control the epidemic's exponential growth in Brazil are the methods the world has heard ad nauseam -- social distancing, no large crowds, restricted movements and good hygiene.

But in many places throughout Brazil, that is just not happening. In bustling Rio de Janeiro, it is easy to find maskless crowds walking the streets, conversing in close quarters. Though the city's famed beaches are closed this weekend, restaurants and bars can still be open until 9 p.m., many likely to be filled to capacity.

Many states have imposed much harsher restrictions including nighttime curfews, but local leaders are fighting against federal leadership, or a lack thereof, determined to keep things open.

President Jair Bolsonaro, a Covid-19 skeptic who has mocked the efficacy of vaccines and hasn't publicly taken one himself, announced Thursday that he would be taking legal action against certain states in the country's Supreme Court, claiming the only person who can decree curfews is him -- something he has promised never to do.Despite thousands of people dying from the virus each day, he claims the real threat is from the economic harm virus-prompted restrictions can impose.

Millions of his supporters are following his lead, openly flaunting local regulations of social distancing and mask wearing.All of this would be concerning enough on its own, but it is exacerbated by a deeply concerning reality -- the spread of Covid-19 variants.

The P.1 variant was first discovered in Japan. Health authorities detected the viral mutation in multiple travelers that were returning from Amazonas state, an isolated region in Brazil's north replete with rainforest.

Nearly two months later, more and more research points to the P.1 variant as a crucial factor not only in the Manaus outbreak but in the nationwide crisis Brazil faces today.A study from Brazil's top medical research foundation, Fiocruz, from early March found that of eight Brazilian states studied, Covid-19 variants including P.1 were prevalent in at least 50% of new cases.

The variant is widely agreed to be more easily transmissible, up to 2.2 times so according to a recent study. That is more transmissible than the widely discussed B.1.1.7 variant first identified in the United Kingdom, which is up to 1.7 times more transmissible, according to a December study.That same study also found that people are 25% to 65% more likely to evade existing protective immunity from previous non-P.1 infections.

Finally, there remain concerns the different vaccines might not be as effective against the P.1 variant. Though a recent study from the UK did find that the "existing vaccines may protect against the Brazilian coronavirus variant," CNN spoke to several epidemiologists who remain concerned.

Amidst Brazil's unmitigated viral spread lies two additional, distinct threats. One, the easier export of the existing P.1 variant abroad. It's already in at least two dozen countries and counting and international travel to and from Brazil is still open to for most countries.Two, if the P.1 variant was created here, so can others.

Under the laws of viral evolution, new variants are created to try and allow the virus to spread more easily. Along the way, more dangerous iterations can be created.

With a lack of a vaccines and a government unwilling to take the steps necessary to prevent that from happening, it is unclear how things get better in Brazil anytime soon.

Many municipal and state health officials and lawmakers blame Bolsonaro's government for undermining their efforts to slow the spread of the coronavirus. And the country's National Council of Health Secretaries (CONASS) has asked the federal government to adopt stricter measures to support hospitals and enforce social distancing.

"The health system in Brazil is on the verge of collapse," Sao Paulo Governor Joao Doria told CNN's Becky Anderson during a recent interview. "There is no national coordination to combat the pandemic in Brazil. It would be important for the President and the governors to send the same message to the population, but this unfortunately, doesn't happen in Brazil.

He has made disobeying health guidance a point of pride, congratulating agricultural workers at an event last week for not staying home "like cowards."

"The emergence of new variants, which combine both the potential to be more transmissible and the absence of broad and articulated mitigation and suppression measures, are highly worrisome," the study's authors wrote, urging Brazil to encourage behaviors that limit the viral spread.

"The data showing the prevalence of this variant in several states and its ample spread throughout the country, as well as the challenges presented due to its high level of transmission, reinforce the immediate need to adopt non-pharmaceutical measures in order to reduce the speed or its spread and the increases in cases."

"This is what viruses do: They evolve, they get stronger. The only way to stop it is to contain its spread, which is why we need restrictive measures -- there is no other solution. Even if the Government decrees a national lockdown, we need the population to adhere. The action of each one of us will impact everyone as a whole," Naveca said.

Hope could be on its way, in the form of vaccines. But Brazil's vaccination rollout was slow in comparison to other countries, including others in the region, like Chile and Mexico.

Since then, roughly 4% of Brazil's 211 million citizens have received at least one vaccine dose, according to data from the Brazilian Health Ministry, and 2.3 million have had two doses.

"Pfizer says this very clearly on the contract, 'we are not responsible for any collateral side effects' - if you turn into an alligator it's your problem," Bolsonaro said in December. "If you become Superman, or grow a beard as a woman, or a man's voice becomes high pitched, they say they have nothing to do with that."

"I thank you for this meeting and we recognize Pfizer as a great world company," Bolsonaro said, during an excerpt of the meeting posted to his official Twitter account. "We would like to close these deals with you, even more given the aggressiveness of this virus in Brazil."

"The story in Brazil can be and will be repeated elsewhere if we stop implementing the measures as we need to implement them," he said. "Countries are going to lurch back into third and fourth surges if we're not careful."

"Unfortunately, I don't think we've learned our lesson," Molina said. "We [health workers] are tired, exhausted and are getting sick. We feel powerless. We need a more coordinated action if we're going to keep this from happening again.

Some of their pain comes from abroad. Brazil’s main trading partners are slowing (China), stagnant (the euro area) or tanking (Argentina). Not only are export volumes down; the prices of things Brazil sells—iron ore, petroleum, sugar and soyabeans—are dropping as global demand falters.

But Brazil and Russia’s problems have domestic roots too. Since the 1990s Brazil has tended to aim for a primary surplus (before interest payments) of close to 3% of GDP—enough to begin reducing its debts. But Dilma Rousseff, the newly re-elected president, has played havoc with Brazil’s public finances. In 2014 spending has expanded at twice the rate of revenues despite one-off gains from the sale of Libra, an oilfield, and the 4G telecoms spectrum. Brazil’s debt-to-GDP ratio is rising fast.

There could be worse to come. The drop in commodity prices looks set to last. Meanwhile, in order to crimp inflation and stem the slide in their currencies the central banks in both countries raised their rates last month: they stand at 11.25% in Brazil and 9.5% in Russia. At the same time, worried finance ministries are keen to bolster their books. In Brazil, fuel-tax hikes are being mooted, and tax breaks on car purchases may be scrapped.

This frugality will hurt. Banks could prove vulnerable as public-sector spending cuts hit incomes and high interest rates make loans hard to service.

Even optimists think the pair will be lucky to grow in 2015. Pessimists see tumbling currencies, bond-market routs and even bank runs.

El Salvador’s Health Ministry is particularly concerned about the rise of cases of Guillain-Barré syndrome, which leads to paralysis, usually temporary; researchers are exploring a possible link between Guillain-Barré and Zika. Forty-six suspected cases of the syndrome had been reported as of last week, Violeta Menjívar, the health minister, said in a radio interview.

virus has appeared in only three Mexican states. The mosquitoes that carry the virus, he said, could not survive in the high altitudes of the central plateau, including Mexico City.“I think it’s good to have these warnings,” he said, “but these things should be explained to people.”

Their model for Zika’s possible spread, using worldwide temperature profiles and air travel routes, also determined that more than 60 percent of the population in the United States lives in areas conducive to seasonal Zika transmission. And about 23 million people in the United States live in places with climates like Florida and parts of Texas where Zika can be transmitted by mosquitoes year-round, the researchers said.The authorities in Brazil insist that they are taking steps to fight Zika, including vaccine research.

He also alarmed various constituencies when, contrary to campaign pledges, he spoke of increasing taxes and when he questioned a proposed partnership between the Brazilian airplane manufacturer Embraer and Boeing, and when he suggested he would allow an American military base on Brazilian soil. His chief of staff said the president was “wrong” on the tax increase, Embraer stock tumbled and generals were reportedly unhappy.

Much will also depend on Mr. Bolsonaro’s ability to deliver on sorely needed economic reforms. That test begins in February, when the new Congress convenes — the president commands only an unstable coalition of several parties, and he is bound to encounter strong opposition to his reforms. A fateful year has begun for Brazil.

Mr. Karipuna said loggers are striding into protected areas, emboldened by Mr. Bolsonaro’s views that the legal protections granted to indigenous lands are an unreasonable impediment to profiting from the Amazon’s resources.

“He empowered them, he told them to invade,” Mr. Karipuna said in a phone interview.

Last week the police in London arrested six activists from the Extinction Rebellion group who glued themselves to the windows of the Brazilian Embassy.

fires had consumed 4.6 million acres of the Brazilian Amazon, a 62 percent increase compared to last year.

In recent months, as the Bolsonaro administration has questioned the usefulness of the Amazon Fund bankrolled by German and Norwegian taxpayers, leaders in those countries have come to consider abandoning it altogether.

The fund was started in 2008, when Brazil was making strides in curbing deforestation through an ambitious set of policies that included aggressive law enforcement and conservation efforts.

Brazil has strict environmental laws and regulations, but they are often violated with impunity. The vast majority of fines for breaking environmental laws go unpaid with little or no consequences.

Jerônimo Goergen, a federal lawmaker from the so-called ruralist caucus, which champions industries seeking broader access to the Amazon, said he was deeply worried about Brazil’s reputation abroad as its approach to the environment has come under harsh scrutiny.“This creates a terrible image for Brazil,” he said. “The agricultural sector stands to suffer the most based on the way this debate is being framed.”

China spent months batting away resentment and distrust as the place where the pandemic began, but in recent weeks its diplomats, pharmaceutical executives and other power brokers have been fielding scores of requests for vaccines from desperate officials in Latin America, where the pandemic is taking a devastating toll that grows by the day.

tion in traditional sports, dancing, singing, commercial and cultural exchange and a dose of politics.

Brazilian President Dilma Rousseff was notably absent from the closing ceremony after being booed at the Oct. 21 opening spectacle by demonstrators angry over a land demarcation proposal they say would be catastrophic for Brazilian natives’ traditional ways of life.

The plan being pushed in congress would give the power to demarcate indigenous lands to the legislative branch, which dominated by the powerful agribusiness lobby. The proposal cast a pall over the games — particularly after it was approved by a congressional commission in the middle of the event. Demonstrators responded by bursting into the arena during the 100-meter dash Wednesday night, forcing a premature end to the evening’s activities.

Billed as a sort of indigenous Olympics, the games featured sports that tend to form part native peoples’ traditions, from goggle-less river swimming to log races. Saturday saw the finals in canoeing, spear throwing and dramatic archery events.

The day’s most arresting sporting moment came with a demonstration of a traditional Mexican game, a high-stakes variation on field hockey played with a giant flaming puck.

The next edition of the games will be held in Canada in 2017.

Luiz Fábio Paiva, a sociologist at the federal university of Ceará and researcher with the Laboratory for the Study of Violence (LEV), says the assertions from the state government, which is “preoccupied excessively with manifesting and demonstrating a hyper-masculine show of fighting violence with violence”, are reckless.

This has contributed to a sharp rise in Brazil’s prison population to 700,489 – the world’s third largest. Of all inmates nationwide, 34.2% are on remand and Ceará holds the record for most prisoners who have not been convicted of a crime.

As well as providing more staff and resources for prisons, judicial practice must change in order to reduce mass incarceration, he says. Despite a law in 2006 decriminalising possession of a small amount of drugs for personal consumption, “they began prosecuting anyone found with drugs, [even] a small quantity at home, as if they were serious traffickers”.

Without investment and reform of the prison system, the cycle of violence and crime continues. “It is right for the state to re-engage with command of the prisons but [Albuquerque] made a mistake by saying he would not respect gangs without [having] a plan.”

“We haven’t changed the prison policy for 30 years, and we just repeat the same mistakes,” says Roseno, who heads a campaign to stop murders of adolescents. “The government needs a policy of penal reform but it doesn’t have one. A prison should aim to [reintegrate] the criminal into society, but only 5% of inmates are studying and only 7% are working – they need skills and education.”

Earlier this year, Mr. Bolsonaro lashed out at two reporters who asked about a corruption case against one of his sons. He told one he had a “terribly homosexual face” and said to another that he was tempted to smash his face in.

Mr. Cuenca saw his criticism as comparatively high-minded. He said he disdains the Universal Church, which has grown into a transnational behemoth since its founding in the 1970s, because he believes it fueled Mr. Bolsonaro’s rise to the presidency, enabling ecological destruction, reckless handling of the coronavirus pandemic and institutional chaos.“I was totally bored, distracted, procrastinating and angry over politics,” Mr. Cuenca said. “What I wrote was satire.”

Taís Gasparian, a lawyer in São Paulo who has defended several people who faced similar bursts of almost-identical, simultaneous lawsuits, said plaintiffs like the Universal Church abuse a legal mechanism that was created in the 1990s to make the justice system accessible and affordable to ordinary people.

The type of action filed against Mr. Cuenca doesn’t require that a plaintiff hire a lawyer, but defendants who don’t show up in person or send a lawyer often lose by default. Universal Church pastors began a similar wave of suits against the journalist Elvira Lobato after she published an article in December 2007 documenting links between the church and companies based in tax havens.The timing and the striking similarities among the lawsuits filed against Ms. Lobato and Mr. Cuenca make it clear they were copy-paste jobs, Ms. Gasparian said.

Many think Mr Cunha could be next. His name has cropped up repeatedly in the context of the affair.

A charismatic populist, Mr Collor’s main sins were a failure to quash hyperinflation—and

tion—and

Brazil has been here before. In 1992 Fernando Collor, Brazil’s first directly elected president after two decades of military rule, was impeached over corruption two years into his term (he was subsequently cleared of the charges on a technicality). A charismatic populist, Mr Collor’s main sins were a failure to quash hyperinflation—and,

Ms Rousseff appears finally to have grasped that budgetary belt-tightening is the first step to recovery. But, like Mr Collor, she lacks the skill to negotiate Brasília’s fragmented political landscape.

And Ms Rousseff will no doubt be more adamant than ever that she is not stepping down of her own accord, as some in the opposition had been hoping. Responding calmly to Mr Cunha, she spoke of her “indignation”.

Sadly, the furore will divert Brazilian politicians’ already scattered attention away from fixing the country’s many problems, starting with the ballooning budget deficit. History may judge this to be Mr Cunha’s greatest sin.

The scientific link between Zika and infant brain damage has not yet been proven. But the rising reports of microcephaly in parts of Brazil stricken by Zika have caused enough alarm that the World Health Organization declared an international public health emergency on Monday, noting that its “experts agreed that a causal relationship between Zika infection during pregnancy and microcephaly is strongly suspected.”

“They come to my office and ask, ‘Is there a chance for my baby to have microcephaly?’”

Dr. Timerman said. “We need to inform them there is. They ask if the chance is big or small. I respond, ‘I don’t know.’ They ask what I would do in their position. I tell them it’s a personal decision, only that the chance is a real one.”

“Later,” Dr. Timerman said, “both patients told me they had abortions.”

“With microcephaly, the child is already very much formed and the parents are conscious of this

“Getting an abortion creates guilt that will stay with the woman for the rest of her life.”

I know this is very difficult because the subject is new, requires thorough discussion and a great deal of religious influences persists,” said Mr. Coelho de Alcântara, a judge in Goiás State. “But my position is that abortion for microcephaly should be allowed.”

“Some children with severe-appearing brain malformations seem to be relatively unaffected,” said Dr. Hannah M. Tully, a neurologist at Seattle Children’s Hospital who specializes in brain malformations. “Yet others with relatively minor structural problems may have profound disabilities.”

Chan, whose agency was assailed as too slow in reacting to West Africa's Ebola epidemic that killed more than 10,000 people in the past two years, cited "first and foremost the big concern about microcephaly," the birth defect that causes babies to be born with abnormally small heads and improperly developed brains.

U.S. Centers for Disease Control and Prevention (CDC) head Thomas Frieden said the WHO emergency declaration "calls the world to action" on Zika. The CDC added four more countries and territories to its list of locales that pose a risk for Zika infection, advising pregnant women to consider avoiding travel to those areas.

Brazil is due to host the Olympics in Rio de Janeiro in August, and President Dilma Rousseff's chief of staff said on Monday there is no risk of cancelling the games due to Zika.

The emergency designation, recommended by a committee of independent experts following criticism of a hesitant response to Zika so far, should help fast-track international action and research priorities. The move lends official urgency to research funding and other steps to stem the spread of the virus.

This marks the fourth time the WHO has declared a global health emergency since such procedures were put in place in 2007, with the others arising from influenza, Ebola and polio.

The Zika virus has raised questions worldwide about whether pregnant women should avoid infected countries. Chan said delaying travel was something pregnant women "can consider" but added that if they needed to travel they should take protective measures by covering up and using mosquito repellent.

Brazil has reported some 3,700 suspected cases of microcephaly. Brazilian Health Minister Marcelo Castro told Reuters the epidemic was worse than believed because in 80 percent of cases the infected people had no symptoms.

As the virus spreads from Brazil, other countries in the Americas are also likely to see cases of babies with Zika-linked birth defects, experts believe. The clinical symptoms of Zika are usually mild and often similar to dengue, which is transmitted by the same mosquito, leading to fears that Zika will spread into all parts of the world where dengue is commonplace.

More than a third of the world’s population lives in areas at risk of dengue infection, in a band stretching through Africa, India, Southeast Asia and Latin America.Zika's rapid spread in Latin America is attributed to the prevalence of Aedes aegypti and a lack of immunity among the population.

A senior Obama administration official, speaking on condition of anonymity, said, "This is not an Ebola-type situation where you have to stop people at the border."

New York State Governor Andrew Cuomo said the state's health department would offer free tests for individuals with symptoms of infection who have traveled to countries impacted by Zika.

The virus was first identified in 1947 in Uganda, and for years lived mostly in monkeys. But last May in Brazil, cases began increasing drastically. The W.H.O. has estimated that four million people could be infected by the end of the year.

“The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,”

A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food.

The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found.

The story is as much about economics as it is nutrition. As multinational companies push deeper into the developing world, they are transforming local agriculture, spurring farmers to abandon subsistence crops in favor of cash commodities like sugar cane, corn and soybeans — the building blocks for many industrial food products.

the rising clout of big food companies also translates into political influence, stymieing public health officials seeking soda taxes or legislation aimed at curbing the health impacts of processed food.

For a growing number of nutritionists, the obesity epidemic is inextricably linked to the sales of packaged foods, which grew 25 percent worldwide from 2011 to 2016, compared with 10 percent in the United States,

The same trends are mirrored with fast food, which grew 30 percent worldwide from 2011 to 2016, compared with 21 percent in the United States

For some companies, that can mean specifically focusing on young people, as Ahmet Bozer, president of Coca-Cola International, described to investors in 2014. “Half the world’s population has not had a Coke in the last 30 days,” he said. “There’s 600 million teenagers who have not had a Coke in the last week. So the opportunity for that is huge.”

, Brazil is a microcosm of how growing incomes and government policies have led to longer, better lives and largely eradicated hunger.

now the country faces a stark new nutrition challenge: over the last decade, the country’s obesity rate has nearly doubled to 20 percent, and the portion of people who are overweight has nearly tripled to 58 percent. Each year, 300,000 people are diagnosed with Type II diabetes, a condition with strong links to obesity.

President Bolsonaro, who continues to promote ineffective and potentially dangerous drugs to treat the disease, has also said lockdowns are untenable in a country where so many people live in poverty. While several Brazilian states have ordered business shutdowns in recent weeks, there have been no strict lockdowns.Some of the president’s supporters in Porto Alegre have protested business shutdowns in recent days, organizing caravans that stop outside of hospitals and blast their horns while inside Covid wards overflow.

Epidemiologists say Brazil could have avoided additional lockdowns if the government had promoted the use of masks and social distancing and aggressively negotiated access to the vaccines being developed last year.

uch conspiracy theories about Covid-19 vaccines have spread widely on social media, including on WhatsApp and Facebook. A recent public opinion poll by the firm IPEC found that 46 percent of respondents believed at least one widely disseminated falsehood about vaccines.Mistrust of vaccines and science is new in Brazil and a dangerous feature of the Bolsonaro era, said Dr. Miguel Nicolelis, a Brazilian neurologist at Duke University who led a coronavirus task force in the country’s northeast last year.

The mistrust and the denials — and the caravans of Bolsonaro supporters blasting their horns outside hospitals to protest pandemic restrictions — are crushing for medical professionals who have lost colleagues to the virus and to suicide in recent months, said Claudia Franco, the president of the nurses union in Rio Grande do Sul.