Photo courtesy of USDA Highly pathogenic avian influenza (HPAI) is a deadly disease of poultry. Recently, H5N1, a subtype of HPAI, was detected in wild birds and commercial and backyard poultry flocks in several U.S. States. With the increase of backyard producers and pet bird owners, the U.S. Department of Agriculture read more USDA Reports — Veterinarians: What You and Your Clients Need To Know About Highly Pathogenic Avian Influenza