A shift in the H5N1 virus has allowed it to spread more easily from birds to cows, raising concerns about its evolution.

In the US state of Nevada, a newly identified H5N1 bird flu strain, D1.1, has been found in six dairy herds. Scientists warn ...

Dairy cattle in Nevada have been found to be infected with a new type of bird flu, distinct from the one that has been ...

Experts said this raises news questions about wider spread and the difficulty of controlling infections in animals and the ...