Avian influenza is a respiratory disease found in wild and domestic birds and other species. When particularly virulent forms emerge that are highly contagious and lethal to domestic poultry, they are classified as HPAI.
Since 2022, every U.S. state has reported cases of HPAI. In some outbreaks, millions of birds were lost from a single farm.
Over 2.3 million organic egg-laying hens have been affected since Nov 2023—over 10% of the U.S. organic layer population.