Bird flu spreads to 3 more Michigan commercial dairy farms | 12 April 2024 | The highly pathogenic avian flu has infected more Michigan dairy farms only three weeks after it first spread to cattle. The Michigan Department of Agriculture and Rural Development announced Friday, April 12 the bird flu was detected in three commercial farms in Ionia, Isabella and Ottawa counties. This brings the total number of infected Michigan dairy herds to four after the flu was confirmed at a Montcalm County farm in late March. An egg farm in Ionia County was also struck by the virus two weeks ago – impacting 4 million birds, federal data show.