WASHINGTON — Americans returning from China landed at U.S. airports by the thousands in early February, potential carriers of a deadly virus who had been diverted to a handful of cities for screening by the Centers for Disease Control and…

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The likelihood that approximately 40% to 45% of those infected with SARS-CoV-2 will remain asymptomatic suggests that the virus might have greater potential than previously estimated to spread silently and deeply through human populations.

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Sweden's chief epidemiologist and the architect of its light-touch approach to the coronavirus has acknowledged the country has suffered too many deaths from Covid-19 and should have done more to curb the spread of the virus. Anders Tegnell, who…

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Science's COVID-19 reporting is supported by the Pulitzer Center. On its face, it was a major finding: Antimalarial drugs touted by the White House as possible COVID-19 treatments looked to be not just ineffective, but downright deadly. A study…

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The handshake came first. Then the high-five, fist bump and more recently, the elbow touch. Canadian researchers are now working on a new greeting, the CanShake. It is not a mere salutation. The CanShake — which involves people shaking their…

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