Chicken plague is avian influenza. Influenza viruses belong to the orthomyxovirus family of RNA viruses and are divided into three types: A, B, and C. Some influenza A viruses are mostly found in birds, and some A types can also infect various mammals such as pigs, horses, seals and whales, as well as humans. Among them, influenza A viruses are mostly found in birds, and some A types can also infect various mammals such as pigs, horses, seals and whales, as well as humans; influenza B and C viruses are seen in the infection of seals and pigs respectively. Usually Asian chicken fever is not normally contagious to humans, but it is more dangerous to poultry. It is recommended that people with weak constitution stay away from it and exercise more in general to strengthen their resistance. However, another type of European chicken plague, also called avian influenza, which is caused by the avian influenza virus, can infect humans.