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AstraZeneca vaccine carries slightly increased risk of bleeding problems, new study shows.

The C.D.C. eased travel recommendations to more than 100 countries, but not because they’re faring better with the virus.

In the U.S., vaccines for the youngest are expected this fall.

New York turns to smart thermometers for disease detection in schools

Covid hospitalizations are rare among children, but still more frequent than for flu, the C.D.C. says.

A rapid antigen test is highly sensitive in young children but prone to false positives, a new study finds.

The coronavirus variant discovered in India has a new name: Delta.

Never mind all the dots and numbers: The W.H.O. is giving variants Greek letters for names.

The C.D.C. says unvaccinated children at U.S. camps can go without masks most of the time when they are outside.

Immunity to the coronavirus may persist for years, scientists find.

The C.D.C. won’t investigate all post-vaccine infections, just those that result in hospitalizations or deaths.

A senior C.D.C. official is departing, the second such resignation this month.

Here’s why the C.D.C. changed its mask advice.

‘We have all longed for this moment’: Vaccinated Americans now may go without masks in most places, the C.D.C. says.

Vaccinated Americans now may go without masks in most places, the C.D.C. said.

C.D.C. approves Pfizer-BioNTech vaccine for children 12 to 15 years old.

C.D.C confirms more cases of rare blood clot disorder linked to J.&J. vaccine

A C.D.C. advisory panel recommends the Pfizer-BioNTech vaccine be made available to 12-to-15-year-olds.

The F.D.A. authorizes the Pfizer-BioNTech vaccine for children 12 to 15.

The F.D.A. authorizes the Pfizer-BioNTech vaccine for children 12 to 15.