Another spillover of the H5N1 bird flu virus from wild birds to dairy cattle appears to have occurred, this time in Arizona.

After a different strain of bird flu was recently found in cattle for the first time, experts reveal what this means in our fight against the virus.

A research veterinarian says an additional strain of the H5N1 virus has been found in dairy cattle, but it’s one he’s seen ...

Federal health officials report a Nevada dairy worker infected with a new bird flu strain, exhibiting mild symptoms. The public remains at low risk.

Both H5N9 and the more common H5N1 strains were found. The USDA is conducting investigations and enhanced surveillance, highlighting H5N1's higher human risk compared to H5N9, which is rarer and ...

H5N1 has been the dominant grouping of strains fueling this past year's outbreaks in the U.S., with different variants of that virus spreading in wild birds, poultry flocks, dairy cattle ...

A new strain of H5N9 bird flu was detected at a commercial duck operation in California's Merced County. All the ducks were euthanized.

Then there's H5N2, which is circulating in British Columbia. It is also a reassortment of the H5N1 virus with another bird flu virus. It was first discovered in November 2024, and has been ...