Michigan officials said the H5N1 bird flu virus has infected three additional dairy herds in the state, just as the USDA recommended farmers test their herds for the virus before moving cattle between states.

The tests “should both give us more … information and should mitigate further state-to-state spread between herds,” said the USDA’s animal health agency.

With the new outbreaks in Michigan, highly pathogenic avian infuenza (HPAI) has been confirmed in 29 dairy herds in eight widely dispersed states, from Idaho to North Carolina. Texas has the largest number of infected herds, 11, followed by New Mexico with six and Michigan with five. Read more