Covid-19: C.D.C. Reverses Testing Advice for Fully Vaccinated

Anyone who has been potentially exposed to the virus should get tested, the C.D.C. now says. Previous guidance recommended testing only for fully vaccinated people who were symptomatic.

Here’s what you need to know:

• Mississippi cites ‘astounding’ rise in Covid-19 cases as Delta variant spreads.

• Nationals postpone M.L.B. game after 4 players and 8 staff members test positive.

• The F.D.A. extends the J&J vaccine’s shelf life to six months.

• Biden plans to announce all civilian federal workers must be vaccinated or face testing.

• Citing new data, Pfizer outlined a case for booster shots, but there’s a debate over whether they’re needed.

• The C.D.C. issued new mask guidance. Will state and local officials follow it?

• State workers in New York must be vaccinated or get weekly tests, Cuomo says.

• All of New York City falls under the C.D.C. guidelines for indoor masking.

The C.D.C. now says fully vaccinated people should get tested after exposure even if they don’t show symptoms.

A medical technician administered a coronavirus test to a walk-in patient at a mobile testing site in Palmetto, Fla., last week.Credit...Octavio Jones for The New York Times

In addition to revising its mask guidance on Tuesday, the Centers for Disease Control and Prevention also quietly updated its testing recommendations for people who are fully vaccinated against the coronavirus.

The agency now advises that vaccinated people be tested for the virus if they come into contact with someone with Covid-19, even if they have no symptoms. Previously, the health agency had said that fully vaccinated people did not need to be tested after exposure to the virus unless they were experiencing symptoms.