What is swine flu?

Swine flu, the full name of swine flu, is an acute infectious respiratory disease of pigs. It is characterized by sudden onset, cough, dyspnea, fever and rapid recovery. Swine flu is a respiratory disease caused by viruses in pigs. Swine flu is caused by influenza A virus (influenza A virus) and usually breaks out in pigs. It is highly contagious, but it usually does not cause death. Autumn and winter are high incidence periods, but they can spread all year round. Swine flu is mostly identified as a subtype of influenza C virus (influenza virus C) or influenza A virus. This virus can cause influenza outbreaks in pigs. Under normal circumstances, human beings are rarely infected with swine flu virus.

There are many different types of swine flu, including influenza A virus subtypes H 1N 1, H 1N2, H3N 1, H3N2 and H2N3, all of which can cause swine flu infection. Unlike bird flu, swine flu can spread from person to person. In the past, humans were infected with swine flu, but there was no case of human-to-human transmission. In mid-April 2009, Mexico announced a case of human-to-human swine flu, which was caused by H 1N 1 swine flu virus. Gene analysis found that there were genes from pigs, chickens, people from Asia, Europe and America. Symptoms of human infection with swine flu: Patients with swine flu usually have high fever, severe headache, muscle pain, cough, stuffy nose, red eye and other symptoms above 39 degrees Celsius.