The dangerous rise of coronavirus variants.

Much of the continent is experiencing a wave of outbreaks driven by the B.1.1.7 variant, which ravaged Britain this winter.

The institution had become a symbol of privilege in a society where social mobility has broken down.

At least 64 pro-government forces and 17 civilians were killed in Afghanistan so far this month.

More countries halt AstraZeneca vaccine use.

This week, the C.D.C. acknowledged what scientists have been saying for months: The risk of catching the coronavirus from surfaces is low.

After a recent increase in new coronavirus cases, the island will put in place a longer overnight curfew starting Friday.

An Air Force veteran and former lion tamer, she helped her adopted country fall in love with tapirs, macaws and peccaries.

Collaborating with devoted colleagues, Dr. Kariko laid the groundwork for the mRNA vaccines turning the tide of the pandemic.

Public schools had previously closed for 10 days if two unlinked cases were detected there, regardless of the source of infection.