​​Avian Influenza is a highly contagious, viral disease of birds, that can cause high mortalities in chickens. The clinical signs are very similar to Newcastle Disease.

All commercial, domestic and wild bird species are susceptible to infection, but disease outbreaks occur more frequently in chickens and turkeys. Many species of wild birds, including waterfowl (geese, ducks and swans) and seabirds, can carry the Avian Influenza virus but generally show no signs of the disease.