A different strain of H5N9 has shown up in U.S. birds before.

This strain of avian influenza emerged in 2022 and brought major losses in the Northern San Joaquin Valley and beyond.

This strain of avian influenza emerged in 2022 and brought major losses in the Northern San Joaquin Valley and beyond.

Five birds across LA County tested positive for highly pathogenic avian influenza H5, also known as H5 bird flu, officials said.

As the highly pathogenic avian influenza outbreak continues, university experts work to develop edible vaccines to protect ...

USDA reports that highly contagious avian influenza that hit the state hard in 2024 has surfaced again in California even as it has severely impacted the Midwest poultry industry in 2025. Last year ...

A new nasal spray vaccine could stop bird flu at the door — blocking infection, reducing spread, and helping head off the next pandemic.

The California condor nearly went extinct, and remains imperiled by the threat of poisoning from lead ammunition.