Think

The C.D.C. no longer recommends universal case investigation and contact tracing.

The Latest on Vaccines for Kids Under 5

U.S. caseloads fall below the Delta peak.

As Covid Shots for Kids Stall, Appeals Are Aimed at Wary Parents

Yes, Omicron Is Loosening Its Hold. But the Pandemic Has Not Ended.

As Omicron Crests, Booster Shots Are Keeping Americans Out of Hospitals

Booster shots are instrumental in protecting against Omicron, new C.D.C. data suggest.

Halting Progress and Happy Accidents: How mRNA Vaccines Were Made

California hospitals find that Omicron causes fewer hospitalizations and shorter stays.

‘People Need to Be Reminded About Flu’

Starting later this week, some at-risk Americans become eligible for a 4th Covid shot.

A Surge in Hospitalized Young Children Infected With the Coronavirus

If you got Pfizer’s vaccine, seek a booster 5 months after the second shot, not 6, the C.D.C. recommends.

J&J’s booster shot provides strong protection against severe disease from Omicron, a study says.

As Omicron Spreads, Officials Ponder What It Means to Be ‘Fully Vaccinated’

Will shortened isolation periods spread the virus?

Omicron is not more severe for children, despite rising hospitalizations.

Moderna says its booster significantly raises the level of antibodies to thwart Omicron.

Most of the World’s Vaccines Likely Won’t Prevent Infection From Omicron

The C.D.C. recommends that other vaccines be preferred over J.&J.