Avian influenza H5N1 infection in humans has spread to seven U.S. states, growing from 46 cases last week to 52 cases this week.

Cases of H5N1 have been climbing nationally, with one West Coast state seeing a rapid increase since the start of October.

The main issue has been a nagging outbreak of avian flu that farmers and health officials have had trouble containing due to ...

Bird flu continues to spread across the U.S., with new infections in Hawaii and continued human outbreaks in California.

Less than a month after reporting its first human case of bird flu, California has confirmed that 16 people have now been ...