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The Vanishing Variants: Lessons from Gamma, Iota and Mu

U.S. nursing home deaths appear to be at pandemic lows.

The use of at-home coronavirus tests jumped during the Omicron wave, but disparities remain, a survey suggests.

U.S. caseloads fall below the Delta peak.

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

Criticized by Senators, U.S. Health Officials Defend Omicron Response

With no way to identify Omicron and Delta patients, doctors struggle with treatment decisions.

Studies Suggest Why Omicron Is Less Severe: It Spares the Lungs

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

Omicron Variant Spreading Twice as Quickly as Delta in South Africa

A C.D.C. study finds stillbirths are higher in pregnant women with Covid.

C.D.C. Panel Endorses Covid Vaccine Booster Shots for All Adults

School nurses battle Covid-19, and angry parents.

Data from Federal Scientists Raise Questions About J.&J. Booster Shots

Boosters Are Complicating Efforts to Persuade the Unvaccinated to Get Shots

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

Is the Coronavirus Getting Better at Airborne Transmission?

Delta variant detected in 99% of U.S. cases, according to C.D.C.

In Review, Top F.D.A. Scientists Question Imminent Need for Booster Shots

In a new review, some F.D.A. scientists and others say boosters aren’t needed for the general population.