In Michigan, it’s been detected at 14 commercial farms and 27 backyard flocks, affecting more than 7 million birds. Most of those were from Herbruck’s Poultry Ranch, the state’s largest egg producer, which depopulated 6.5 million hens after finding a sick bird in April 2024.

The CDC says the public health risk is low and no infected birds or bird products will enter the commercial food chain.