Coronavirus

Although persistent infections are rare, experts said there are many people with compromised immune systems who remain at risk of severe COVID-19.

Now that most airlines have made masks optional in the U.S., here's where the four largest stand on bringing back passengers who refused to wear them when they were required.

Centers for Disease Control and Prevention asks Justice Dept. to appeal ruling that voided federal travel mask mandate.

The Justice Department announced Wednesday that 21 people have been charged in the past nine days as part of a nationwide enforcement push to root out those who exploit the pandemic through health care fraud schemes.

Previous COVID-19 infections may not protect you for long against new variants of the disease, a new CDC study says.

Major airlines and airports in places like Dallas, Atlanta, Los Angeles and Salt Lake City quickly switched to a mask-optional policy.

The new U.S. government center aims to become the National Weather Service for infectious diseases.

Moderna hopes to offer updated COVID-19 boosters in the fall that combine the original vaccine with protection against the latest variant.

The TSA said it will no longer enforce mask-wearing on public transportation after a federal judge in Florida voided the mandate.

Yet again, the U.S. is trudging into what could be another COVID-19 surge, with cases rising nationally and in most states after a two-month decline.