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Original Article from The New England Journal of Medicine — Covid-19 Breakthrough Infections in Vaccinated Health Care...

Two travelers trying to enter Toronto from the U.S. were fined after providing false information related to proof of...

People with compromised immune systems and the unvaccinated make up a high percentage of patients who end up in the...

Former CDC Director Tom Frieden urged mask-wearing during a Fox News appearance on...

How this latest stage plays out in the U.K. will offer valuable clues to the U.S. and other countries over what to expect as...

Making a safe, effective Covid-19 vaccine will be hard enough, but distributing it and building trust for widespread participation will be even...

This report describes COVID-19 outbreaks associated with...

About 3 billion people in the world do not have access to modern energy sources for cooking and heating their homes. They are suffering...

The agency’s new guidance on masking is right. But its messaging remains...