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An Animal Virus Infected the Man Who Received a Pig’s Heart

Death Toll During Pandemic Far Exceeds Totals Reported by Countries, W.H.O. Says

Abortion Pills Stand to Become the Next Battleground in a Post-Roe America

Few Transgender Children Change Their Minds After 5 Years, Study Finds

State abortion restrictions may jeopardize women with high-risk pregnancies, some doctors fear.

The Vanishing Variants: Lessons from Gamma, Iota and Mu

What Scientists Know About the Unusual Hepatitis Cases in Children

F.D.A. Moves to Ban Sales of Menthol Cigarettes

The Coronavirus Has Infected More Than Half of Americans, the C.D.C. Reports

More than half of Americans have been infected with the coronavirus at least once, the C.D.C. says.

Most Americans have been infected with the coronavirus at least once, the C.D.C. says.

Pulling Back the Curtain on Race and Health Care

The Drive to Vaccinate the World Against Covid Is Losing Steam

Mask Ruling Underscores Deep Split in Attitudes

Exploring the Health Effects of Ageism

The Drive to Vaccinate the World Against Covid Is Losing Steam

Tucker Carlson Has a Cure for Declining Virility

India Is Stalling the W.H.O.’s Efforts to Make Global Covid Death Toll Public

A New Covid Breath Test Holds Promise, but Wide Use May Still Be Far Off

Many U.S. virus cases go uncounted. Are there better ways to track the pandemic?