Within 24 to 48 hours of the first detection of the virus, state and federal animal health officials work with farms to cull ...

The finding indicates that the virus, known as H5N1, has spilled from birds into cows at least twice — leading to these two ...

San Mateo County public health officials reported finding H5N1 bird flu in a pet cat and a backyard poultry flock.

Nearly 119,000 birds have been culled at a farm in California after a bird flu called H5N9 was detected among the poultry ...