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An F.D.A. panel endorses Merck’s Covid pill for high-risk adults.

South African Company Nears License to Sell J. & J. Covid Shot Across Africa

Regeneron says its antibody treatment may not be as effective against Omicron, but testing is underway.

The C.D.C. strengthened its booster recommendations as worries mount over the Omicron variant.

Omicron carries scary mutations. That doesn’t mean they work well together.

Antiviral Covid Pills Are Coming. Will There Be Enough Tests?

Stamping Bar Codes on Cells to Solve Medical Mysteries

Does Omicron cause only mild illness? The jury is still out.

As Covid Infections Spread, Nursing Homes Lag Behind on the Rollout for Booster Shots

A Cure for Type 1 Diabetes? For One Man, It Seems to Have Worked.

Families Cheer, Some Doctors Worry as Nursing Homes Open Doors Wide to Visitors

New Virus Variant Stokes Concern but Vaccines May Still Work

Texas Abortion Law Complicates Care for Risky Pregnancies