Influenza is an acute respiratory infection caused by the influenza virus, and is a highly contagious and fast-spreading disease. It is mainly spread through airborne droplets, person-to-person contact or contact with contaminated objects. It usually starts rapidly with symptoms such as high fever (≥38°C), headache, sore throat, cough, and body aches. The fall and winter seasons are generally its high incidence period. Human influenza viruses are generally classified into type A, type B and type C. Among them, human influenza A viruses can be classified into type A H3N2 and type A H1N1. Type A viruses often undergo antigenic mutation, are highly contagious, spread rapidly, and are prone to widespread epidemics. The disease is self-limiting, but in infants and young children, the elderly and patients with underlying cardiopulmonary diseases are prone to serious complications such as pneumonia, resulting in death. Treatment 1.General symptomatic treatment Bed rest, drink more water, give liquid or fluid diet, appropriate nutrition, vitamin supplementation, rinse mouth with warm water or warm salt water after eating, keep mouth and nose clean, anti-infection treatment when systemic symptoms are obvious. 2.Treatment principles Early application of antiviral treatment. To adhere to the principles of prevention and isolation and drug treatment, due to treatment and symptomatic treatment. The basic principles include early application of anti-influenza virus drugs, avoiding blind or inappropriate use of antibacterial drugs, strengthening supportive treatment, prevention and treatment of complications, and reasonable application of symptomatic treatment drugs. Anti-influenza virus drug treatment. Anti-influenza virus medication should be started as early as possible within 36 or 48 hours after the onset of illness. Although some data suggest that neuraminidase inhibitors can also be effective after 48 hours of onset, most studies have demonstrated that early treatment is more effective. Prevention Seasonal influenza is highly transmissible from person to person, and active prevention and control is more important than limited effective treatment. The main preventive measures are as follows. Enhance personal hygiene awareness and education 1. Keep indoor air circulation and avoid going to crowd gathering places during the peak of epidemic. 2.Use tissues when coughing and sneezing to avoid droplet transmission. 3.Wash hands thoroughly and avoid contact with mouth, eyes and nose with dirty hands. 4.See a doctor promptly if flu-like symptoms appear during the epidemic, and reduce contact with others and try to rest at home. 5. Influenza patients should be isolated from the respiratory tract for 1 week or until the main symptoms disappear. Patient’s utensils and secretions should be thoroughly disinfected. 6.Strengthen outdoor physical exercise to improve the body’s ability to fight diseases. 7.In autumn and winter, the climate is changing, pay attention to add and remove clothes. 8.Prevention and control of outbreak epidemics in institutions. 9.Vaccination against influenza. 10.Anti-viral drug prevention.