The H5N1 strain of avian influenza—commonly known as bird flu—has been circulating among wild migratory birds for the past two years, with substantial spillover into poultry farms. But what's sparking ...

Another dairy farm worker in Michigan has been infected with avian influenza virus, state and federal health officials reported Thursday. The case marks the third time the outbreak of bird flu in ...

A study published Monday provides new evidence that the H5N1 virus currently causing an outbreak of bird flu in U.S. dairy cattle may be adapted to better infecting humans than other circulating ...

In early March, Dr. Barb Petersen, a large-animal vet in Texas, began getting calls from the dairy farms she works with in the Panhandle. Workers there were seeing a lot of cows with mastitis, an ...

The same version of the bird flu that has caused the most serious human illnesses in North America has now turned up in dairy cows. Cattle in Nevada tested positive for the H5N1 viral variant D1.1, ...