14 herds in Michigan https://www.avma.org/resources-tools/animal-health-and-welfare/animal-health/avian-influenza/avian-influenza-virus-type-h5n1-us-dairy-cattle
Wild Ducks as Long-Distance Vectors of Highly Pathogenic Avian Influenza Virus https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2570914/