Avian flu (H10N3) is a highly contagious viral disease caused by influenza, with up to 100% mortality in domestic fowl. All types of birds are susceptible to the virus, but outbreaks occur most often in chickens and turkeys. The infection may be carried by migratory wild birds, which can carry the virus but show no signs of disease. Humans are only rarely affected.
In May 2021, the Communist Party of China reported the first known case of Bird flu transmitted to a human.