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

Poultry on a commercial farm in England have been infected with the bird flu virus, the U.K. government said Sunday. The H5N1 virus was found in kept birds in St. Ives, a seaside town in Cornwall. All ...

The Centers for Disease Control and Prevention on Friday confirmed that a person contracted bird flu in a case linked to an ...

It once nested in hollow trees, but today it nearly always nests in chimneys or other structures. Because the bird can be easily captured and banded in such situations, it has been studied much more ...