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The Delta variant caused a spike in deaths among nursing home residents, study finds.

Is the Coronavirus Getting Better at Airborne Transmission?

How Accurate Are At-Home Covid Tests?

Covid Vaccine Prompts Strong Immune Response in Younger Children, Pfizer Says

The F.D.A. again warns parents not to get children under 12 vaccinated yet.

The F.D.A. again warns parents not to get children under 12 vaccinated yet.

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

U.S. virus cases are more than ten times too high, Fauci says.

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

When Will the Delta Surge End?

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

Caught in the Crossfire Over Covid’s Origins

Good, but Not Great: Taking Stock of a Big Ten University’s Covid Plan

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

Why Not Just Tell Everyone to Wear Masks?

As demand surges in the U.S., counties reopen virus testing sites.

What to Know About Breakthrough Infections and the Delta Variant