The infectious period of influenza A is generally 1 week’s time, the incubation period can be up to 7 days, mostly 1~3 days. Influenza A infectious period is generally 1 week’s time, in the incubation period is less infectious, 1 week after the onset of the disease is contagious, 3 days before the onset of the most contagious. It spreads mainly through runny nose, saliva, sputum, through coughing, coughing up sputum, talking loudly, sneezing, etc. It can also spread through the form of aerosol, i.e., small particles floating in the air, which are infected by inhalation by the surrounding population. The incubation period of influenza A can be as long as 7 days, mostly 1-3 days, and the onset of the disease is more rapid with more changes in symptoms. If the beginning of the headache, fever, chills, myalgia and general malaise, and accompanied by respiratory symptoms, such as cough and sore throat. Attention to suffering from influenza A should seek medical treatment in a timely manner, healthy people around the emergence of influenza A patients to do a good job in advance to prevent.