Nevada dairy cattle infected with a new bird flu strain, Type A H5N1 D1.1, raising concerns of multiple transmission channels.

A new variant of the H5N1 bird flu — the same one that led to the death of a Louisiana man — has for first the first time been found in infected U.S. dairy cattle.

A new strain of bird flu has infected dairy cows in Nevada, marking the second time the virus has jumped from birds to cattle. This latest infection — reported by the U.S. Department of Agriculture (USDA) Wednesday — involves a strain of H5N1,