China’s New Testing Policy for Travelers Is Problematic, Experts Say

As cases of the coronavirus continue to climb worldwide, many countries are doubling down on testing policies that can grant or bar entry to travelers attempting to move across international borders. But an unusual new testing policy, announced by China at the end of October, has health experts baffled. It requires inbound travelers to present negative results from an antibody […]

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What Does ‘Negative’ on a Coronavirus Test Really Mean?

President Trump’s recent tests are a reminder that although many products exist, none test for infectiousness. By Katherine J. Wu In a flurry of memos released this week and last, the White House physician, Dr. Sean Conley, stated that President Trump no longer posed a transmission risk to others — an assessment, he noted, that was largely precipitated by the results […]

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New York Will Test the Dead More Often for Coronavirus and Flu

New regulations require a ramp-up in testing for patients with symptoms, as well as people who weren’t tested before they died. By Katherine J. Wu Cough, fever, chills — with fall fast on the way, symptoms alone won’t be useful in distinguishing Covid-19 from similar-looking cases of the flu. That means routinely testing for both viruses will be crucial — […]

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