Influenza A H3N2 subtype: Influenza A viruses are divided into different subtypes according to the type of protein on the surface of the virus and its binding. Influenza A H3N2 subtype has been more active and common in the capital in recent winters. Its symptoms include fever, cough, sore throat, body aches, headache, chills and fatigue, some are accompanied by diarrhea and vomiting, and in severe cases, pneumonia and respiratory failure. Influenza virus prevention and control measures: 1. Minimize visits to crowded, air-dirty and confined places. 2, pay attention to personal hygiene, wash hands regularly, sneeze or cough, use a handkerchief or tissue to cover the mouth and nose. 3. Avoid contact with patients with influenza-like illnesses as much as possible, and wear a mask if you must. If you develop flu-like symptoms, seek medical attention promptly. 4. People who have not yet received influenza vaccination, especially children, the elderly and people with chronic underlying diseases and other groups at high risk of influenza, should actively receive influenza vaccination.