The incubation period is the time between the virus infecting the body and the onset of symptoms. Influenza A has an incubation period. The incubation period of influenza A is 1~7 days on average, from the time it infects the human body to the time it develops, it can take a week if it is long, or 2~3 days if it is short. The incubation period is usually asymptomatic, with only a small percentage of patients experiencing suspected gastrointestinal symptoms or upper respiratory tract infections. Influenza A has a certain degree of contagiousness during the incubation period, 1~2 days before the onset of contagiousness is relatively high, after the onset of high fever, sneezing, sore throat, cough, runny nose and other respiratory symptoms, 5~7 days after the onset of the onset of the high-risk infectious period. If diagnosed with influenza A, people around should improve their own resistance, such as high fever, sore throat and other symptoms should go to the hospital in a timely manner, and actively cooperate with the doctor for treatment.