The H5N1 avian influenza virus is mutating to evade immune defenses in mammals following prior infection or vaccination.

Soon after the discovery of highly pathogenic avian influenza (HPAI) strain H5N1 in dairy cattle, scientists learned that ...

Mar. 3, 2025 — As highly pathogenic H5N1 avian influenza continues to spread in the U.S., posing serious threats to dairy and poultry farms, both farmers and public health experts need better ...

USDA’s Food Safety and Inspection Service (FSIS) announced Friday that the H5N1 virus was discovered in meat from a single cull dairy cow as part of testing of 96 dairy cows. APHIS said the meat ...

"Globally, we continue to see that mammals can be infected with avian influenza A (H5N1)," Meera Chand, Emerging Infection ...

A single sheep on a Yorkshire farm has tested positive for H5N1 bird flu, the UK’s Chief Veterinary Officer has confirmed.

The H5N1 strain of bird flu has the "potential to become a pandemic", according to an expert at the UK Health Security Agency. Richard Pebody, director of epidemic and emerging infections at UKHSA ...

Previous exposures to older flu strains prime the immune system to produce antibodies against bird flu (H5N1).