Symptoms of influenza A include fever, cough, sore throat, body aches, headache, chills and fatigue, etc. Treatment includes medication such as oseltamivir phosphate and zanamivir, symptomatic treatment, and enhanced rest. Influenza A is an acute respiratory infectious disease, in which most of the infected subtypes are H1N1 influenza viruses, and the population is generally susceptible and highly contagious. Symptoms mainly include influenza symptoms such as fever, cough, sore throat, body aches, headache, chills and fatigue, and there may also be diarrhea or vomiting, muscle aches or fatigue, and reddening of the eyes. According to the “Influenza A (H1N1) Diagnosis and Treatment Program (2009)”, antiviral medication is not recommended for patients with a short course of mild influenza A. Symptomatic treatment is recommended to reduce fever and cough, and to strengthen rest. For high-risk groups such as pregnant women, children, people with underlying diseases, and the elderly, who are prone to develop severe cases, it is recommended that antiviral drugs such as oseltamivir phosphate and zanamivir be actively used. The main prevention of influenza A, especially for high-risk groups, it is recommended to avoid going to places where people gather, wear a mask when going out, wash your hands frequently, and seek medical treatment once suspected of being infected. The medication should be used under the guidance of a medical professional, and should not be used on its own.