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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