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Leonard Hayflick, Who Discovered Why No One Lives Forever, Dies at 98

She Helped Unlock the Science of the Covid Vaccine

The U.S. government will buy 3.2 million doses of Novavax’s Covid vaccine.

Two new versions of Omicron are gaining ground in the U.S., according to C.D.C. estimates.

Black adults were hospitalized at higher rates than whites during the U.S. Omicron wave.

The W.H.O. strengthens its booster endorsement but still emphasizes getting primary shots to more people.

Charting an Omicron Infection

Fauci warns against complacency amid data that Omicron causes milder illness

Who should get a booster shot? It depends, Dr. Scott Gottlieb says.

Who should get a booster shot? It depends, Dr. Scott Gottlieb says.

What We Know So Far About Waning Vaccine Effectiveness

Merck applies for emergency approval for what would be the first pill to treat Covid.

Boosters are most likely on the way for recipients of the Moderna and J. &. J. vaccines.

Only a fraction of U.S. health care workers are risking their jobs over vaccinations.

Boosters for Moderna and Johnson & Johnson vaccine recipients weren’t up for debate during a C.D.C. panel.

How to Vaccinate a Siberian Reindeer Herder

The F.D.A. is likely to make its long-awaited decision on boosters this week.

Hours before the F.D.A. vote, the C.D.C. releases a study showing waning protection of the Pfizer vaccine.

Researchers will tackle an unusual question: Might the vaccines affect women’s periods?

J. & J. finds that a second dose of its vaccine provides a strong boost.