Bosnia has reported an outbreak of highly pathogenic H5N1 avian influenza, the World Organisation for Animal Health said on Tuesday, as a seasonal wave of the disease known as bird flu continues in Europe.

Nevada reported its first human case of bird flu in a farm worker exposed to infected dairy cattle, marking an extension of the U.S. outbreak. The worker is recovering, and authorities state no person-to-person spread has been observed.

The variant of bird flu that killed a Louisiana resident has now been found in dairy cows. Until now, the human cases of bird flu traced to cattle have been mild, mostly eye infections. But the U.S. Department of Agriculture confirmed that a strain previously found only in wild birds has turned up in dairy herds in Nevada ‒ raising concerns that future human infections could be more serious.