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Health guidance issued Tuesday recommends that fully vaccinated people wear masks indoors if they're in areas with "substantial" or "high" transmission of Covid-19. But what do "substantial" and "high" actually mean? ...
In Britain, they know 92% of the public has antibodies; here we panic in the dark. ...
The Washington Post's Yasmeen Abutaleb reports on a new report from the Centers for Disease Control that discusses new threats and response efforts as the delta variant of Covid-19 spreads in the U.S. ...
White House chief medical adviser Dr. Anthony Fauci on Wednesday called for everyone to wear masks indoors again, even those who have been vaccinated, as the United States deals with the Delta variant of the coronavirus. | Clips ...

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