Researchers have identified new roles for a protein long known to protect against severe flu infection -- among them, raising the minimum number of viral particles needed to cause sickness.

Surging infections and missed vaccinations put thousands of lives at risk, threatening global elimination goals.

There have been dozens of confirmed human cases of bird flu in the U.S. this year. Experts discuss the symptoms, risks and ...

It’s been nearly eight months since avian flu was first detected in US dairy herds, and cases in both cows and humans ...

With 46 U.S. cases and alarming signs of the virus crossing species, experts warn of unpredictable risks if human-to-human ...

The WHO and CDC say there were about 10.3 million cases of measles last year, up 20 percent from 2022. Children are ...