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Unvaccinated Americans are 11 times more likely to die of Covid, the C.D.C. reports.

Unvaccinated Americans are 11 times more likely to die of Covid, the C.D.C. reports.

Will vaccine mandates slow the pandemic? Yes, scientists say — but not immediately.

Hospitalizations for children sharply increase as Delta surges, C.D.C. studies find.

A San Diego hospital system reported a small resurgence of Covid, even among vaccinated workers.

When Will the Delta Surge End?

F.D.A. Fully Approves Pfizer-BioNTech’s Vaccine, a First for a Covid-19 Shot

The Delta variant doubles the risk of hospitalization by the Alpha variant, a study finds.

Breakthrough Covid Cases: Uncommon and Often Mild, But Not Always

Second Dose of J. & J. Vaccine Gives Strong Boost, Company Reports

Second Dose of J. & J. Vaccine Gives Strong Boost, Company Reports

Vaccines prevented fewer infections as Delta emerged, federal researchers find.

F.D.A. Fully Approves Pfizer-BioNTech’s Vaccine, a First for a Covid-19 Shot

Vaccine Effectiveness Against Infection May Wane, C.D.C. Studies Find

Vaccines’ protection against virus infection is waning, C.D.C. studies suggest.

Vaccines’ protection against virus infection is waning, C.D.C. studies suggest.

In a Handful of States, Early Data Hint at a Rise in Breakthrough Infections