Introduction of influenza virus

Influenza virus is called influenza virus for short. 1 can be divided into three types: A, B and C. Bovine influenza viruses discovered in recent years will be classified as D. Influenza viruses can cause infections and diseases in animals such as humans, poultry, pigs, horses and bats, and are the pathogens of human influenza, avian influenza, swine influenza and equine influenza. The typical clinical symptoms of these epidemics are acute high fever, general pain, obvious fatigue and respiratory symptoms. Influenza virus is mainly spread through droplets in the air, contact between susceptible people and infected people, or contact with contaminated items. Generally, autumn and winter are its high incidence period. Human influenza is mainly caused by influenza A virus and influenza B virus. Influenza A virus often has antigenic variation, which can be further divided into H 1N 1, H3N2, H5N 1, H7N9 and other subtypes. (where H and N represent two surface glycoproteins of influenza virus, respectively). Influenza virus has no resistance to the outside world. Animal influenza viruses usually do not infect people, and human influenza viruses usually do not infect animals, but pigs are an exception. Pigs can be infected with both human influenza virus and avian influenza virus, but mainly with swine flu virus. A few animal influenza viruses can cause human influenza epidemic after adapting to humans.