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Antigen tests don't amplify their protein signal, so they are inherently less sensitive. To make matters worse, that signal gets diluted when samples are mixed with the liquid needed to enable the material to flow across test strips. As a result, most antigen tests have a sensitivity of anywhere between 50% and 90%-in other words, one in two infected people might incorrectly be told they don't have the virus. Last month, Spanish health authorities returned thousands of SARS-CoV-2 antigen tests to the Chinese firm Shengzhen Bioeasy Biotechnology after finding the tests correctly identified infected people only 30% of the time, according to a report by the Spanish newspaper El Pais.

Scientists say that widespread testing is needed to get outbreaks of the new coronavirus under control. But in many regions, there's a shortage of the chemicals needed to run tests. In several countries, health officials have started using a strategy that was first proposed in the Second World War: group testing. By testing samples from many people at once, this method can save time, chemical reagents and money, say researchers.

Researchers at Kyoto University's Institute for Integrated Cell-Material Sciences (iCeMS) in Japan have designed a small 'body-on-a-chip' device that can test the side effects of drugs s on human cells. The device solves some issues with current, similar microfluidic devices and offers promise for the next generation of pre-clinical drug tests.

Pandemic shaming, a national pastime since the spring, intensified in the weeks leading up to Thanksgiving. Thousands waited in line, some for many hours, for a preholiday coronavirus test, only to be rebuked as careless, selfish violators of public-health rules. "I do want people to understand that testing on Thursday so you can party on Saturday: That doesn't work," said Barbara Ferrer, Los Angeles County's director of public health. "It's not effective, and you really are in some ways wasting a valuable resource." Those long lines included people whose families were begging them to visit; students whose campuses had just closed for the semester; and people who were observing state rules requiring visitors to get tested 72 hours before arriving. Yet even people who were trying to be careful weren't spared from criticism: Many news articles and comments from public officials portrayed Thanksgiving travelers, regardless of the precautions they were taking, as irresponsible people. On social media, they were maligned as #covidiots, recklessly endangering themselves and their loved ones.

Mandatory diversity statements can too easily become a test of political ideology and conformity. "No political test shall ever be considered in the appointment and promotion of any faculty member or employee." This fundamental principle, forged in one of the most difficult periods the UC system has ever endured, must not be abandoned.

Clinical suspicion and indicated SARS-CoV-2 testing, including antibody testing, might be needed to recognize and treat adults with MIS-A. Further research is needed to understand the pathogenesis and long-term effects of this condition. Ultimately, the recognition of MIS-A reinforces the need for prevention efforts to limit spread of SARS-CoV-2. COVID-19