Influenza (influenza for short) is an acute respiratory infection caused by influenza virus, which can occur throughout the year, with the peak season of influenza onset in autumn and winter, and is mainly spread through airborne droplets. The main manifestations are systemic symptoms such as chills, high fever, headache, generalized muscle aches, fatigue, diarrhea, etc., while respiratory symptoms such as runny nose, nasal congestion, sore throat, cough, etc. are mild. Most patients will recover in 1 to 2 weeks, but elderly and frail patients with chronic underlying diseases, infants and young children are prone to complications such as pneumonia, myocarditis, worsening chronic heart and lung diseases, and even life-threatening in severe cases. Treatment of influenza: pay attention to rest, drink more water, and eat a diet that is easy to digest; treat symptomatically by applying antipyretics, drugs to relieve nasal mucosal congestion, and cough expectorants, but avoid using aspirin or aspirin-containing drugs in children; treat with anti-influenza virus drugs within one to two days of the onset of influenza; consider applying antibiotics only when secondary bacterial infections occur. Prevention of influenza: Preventive measures include: isolating patients, increasing ventilation and air disinfection in public places during epidemics; avoiding crowded places during high influenza season, preferably wearing a mask; covering the nose and mouth with a handkerchief or tissue when influenza patients sneeze or cough to avoid droplet transmission to others; paying attention to personal hygiene, washing hands frequently with hand sanitizer (soap) and water, especially after coughing or sneezing; strengthening Nutrition, moderate exercise, adequate rest to improve the immunity of the body; vaccination against influenza. Vaccination is recommended for the following groups: people over 65 years old, people with chronic diseases, people with suppressed immune function, people who are frail and sick, children older than 6 months old, and workers in hospitals, nursing homes, and childcare institutions. Influenza vaccination is given 1-2 months before the peak of the flu epidemic every year, from September to November, but people who are allergic to egg whites, pregnant women within the third trimester, and people with fever or infection should not be vaccinated temporarily.