Covid-19 Live Updates: C.D.C. Chief Urges Caution for Unvaccinated Ahead of Memorial Day
Despite gains against the virus, the C.D.C. director said the large segment of Americans who aren’t vaccinated must remain careful. Moderna announced that its Covid-19 vaccine was powerfully effective in 12- to 17-year-olds. It plans to apply for F.D.A. authorization.
