A symbol map of the U.S. showing commercial and backyard flocks of birds affected by avian flu in the last 30 days, as of Feb. 3, 2025. Overall, about 23 million birds have been affected in 124 flocks. 38% of all affected birds were in Ohio flocks, followed by Missouri at 19%, North Carolina at 15% and Indiana at 13%. The flu has been detected in flocks located in 31 states.