This latest outbreak is part of a broader epizootic that has swept across the United States, affecting not only poultry but also wild birds, mammals and humans.

In today’s Health Alert, a new strain of bird flu - H5N9 - has been detected in the U.S. The first confirmed case was found at a commercial duck farm in California.

The bird flu has been infecting American flocks for years, leading to a series of infections and increased egg prices. But now, there's a new twist: A different strain has been detected in U.S. poultry.