Jan 31, 2025 · A multistate outbreak of HPAI A(H5N1) bird flu in dairy cows was first reported on March 25, 2024. This is the first time that these bird flu viruses had been found in cows. In the United States, since 2022, USDA APHIS has reported HPAI A(H5N1) virus detections in more than 200 mammals.

1 day ago · A variant of H5N1 bird flu that has circulated widely in wild birds — and in several instances led to severe illness in humans — has turned up in dairy cattle for the first time.. The findings ...

1 day ago · A second type of bird flu has been found in U.S. dairy cows for the first time, the U.S. Department of Agriculture (USDA) announced on Wednesday. Until recently, all dairy herd detections in the U ...

1 day ago · Dairy cattle in Nevada have been infected with a new type of bird flu that’s different from the version that has spread in U.S. herds since last year, Agriculture Department officials said Wednesday.. The detection indicates that distinct forms of the virus known as Type A H5N1 have spilled over from wild birds into cattle at least twice.

1 day ago · The Centers for Disease Control and Prevention says that 40 out of the 67 confirmed human bird flu cases since 2024 have been linked to exposure to dairy cows sick with the virus. Most of the ...

4 days ago · Lactating cows have been most highly affected, and signs of illness have been reported in less than 10% of cows within a herd. While avian influenza virus type A (H5N1) is associated with high morbidity and mortality in birds ("highly pathogenic"), this hasn't been the case for dairy cattle.

1 day ago · Dairy cows in Nevada have been infected with a new form of bird flu that is distinct from the version that has been spreading through herds over the last year, the U.S. Department of Agriculture ...

1 day ago · The U.S. Department of Agriculture has detected a bird flu strain in dairy cattle that previously had not been seen in cows, the agency’s Animal and Plant Health Inspection Service said on ...

Apr 8, 2024 · The H5N1 strain of avian influenza has been found in dairy cows, raising concerns among scientists about what the spillover could mean for humans—and whether the virus has pandemic potential.

As the H5N1 Bird Flu virus continues to spread, our State Veterinarian placed a ban on poultry and dairy cattle exhibitions at fairs and shows on January 8, 2025, until further notice. This decision was made to protect California’s remaining unaffected dairy herds and poultry flocks across California.