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People who test positive need to isolate themselves for 5 days if they don't show symptoms. The change reflects "what we know about the spread of the virus" and vaccine protection, the CDC chief says.

The Senate and House have approved a $1.5 trillion government spending package, plus $13.6 billion in emergency funding for Ukraine. Billions in new COVID aid requested by the White House was cut.

Just saying "hello" to a passerby can be a boon for both of you. That's what researchers are finding in studies we covered in our "Living Better" series. We asked readers to offer their own testimony.

So far, nearly 80% of California residents have been vaccinated with at least one dose of the COVID vaccine. The extended statewide mask mandate is set to expire on Feb. 15.

A map of confirmed COVID-19 cases and deaths around the world. The respiratory disease has spread rapidly across six continents and has killed millions.

FDA Commissioner Martin Makary discusses vaccine policy, COVID-era decisions and the erosion of trust in government health guidance.

A lawyer who lost her job. A single mom with HIV. A grandmother who thought she had enough money to get by. A onetime golf coach. They're among the millions now struggling to put meals on the table.

Researchers launched a major study of an experimental Alzheimer's drug this summer. They also learned a lot about how to protect participants who must make frequent visits to a medical center.

In the midst of record COVID case numbers in the U.S., biostatistician Natalie Dean walks us through how to assess the metrics.

It was a busy day at the Stade de France where U.S. track and field athletes claimed three gold medals at the Paris Summer Olympics.