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The New War on Bad Air

Premature Births Fell During Some Covid Lockdowns, Study Finds

Long Covid Is Keeping Significant Numbers of People Out of Work, Study Finds

‘He Goes Where the Fire Is’: A Virus Hunter in the Wuhan Market

New Coronavirus Lineage Discovered in Ontario Deer

When Can the Covid Masks Finally Come Off?

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

What to Know About the Coronavirus in Pets

Is the Coronavirus Getting Better at Airborne Transmission?

Unvaccinated Americans are 11 times more likely to die of Covid, the C.D.C. reports.

Unvaccinated Americans are 11 times more likely to die of Covid, the C.D.C. reports.

Breakthrough infections are less likely to lead to long Covid, a study suggests.

Breakthough infections are less likely to lead to long Covid, a study suggests.

New data confirm Pfizer and Moderna vaccines bring a small risk of heart problems, especially for boys and younger men.

What to Know About Boosters if You Got the Johnson & Johnson Vaccine

Breakthrough Covid Cases: Uncommon and Often Mild, But Not Always

Babies and Toddlers Spread Virus in Homes More Easily Than Teens, Study Finds

Why Not Just Tell Everyone to Wear Masks?

The C.D.C. endorses Covid vaccinations during pregnancy.

Vaccinated People May Spread the Virus, Though Rarely, C.D.C. Reports