The Highly Pathogenic avian influenza virus is a highly contagious disease that spreads among birds and other animals.

More than 160 million wild and domestic birds have been infected with bird flu across the United States since 2022.

Since 2021, experts have seen bird flu — also called H5N1 influenza or highly pathogenic avian influenza (HPAI) — spreading "fairly quickly" across the wild and domestic bird populations and, now, ...