Symptoms of H3N2 infection include systemic symptoms such as fever and chills, respiratory symptoms such as sore throat and cough, and gastrointestinal symptoms such as vomiting and diarrhea. Mildly infected patients generally do not need medication, and those with symptoms can be treated symptomatically with drugs such as ibuprofen, and close observation of the condition is sufficient; in severe cases, anti-influenza virus treatment should be given as early as possible. Infection with H3N2 virus is usually acute, patients may have fever symptoms, some patients may appear 39 ~ 40 ℃ fever, accompanied by muscle, joint pain, extreme fatigue, loss of appetite and other systemic symptoms, sore throat, cough, nasal congestion, runny nose and other respiratory symptoms, as well as vomiting, diarrhea and other gastrointestinal symptoms. Mild cases are often similar to the common cold, but their fever and systemic symptoms are more pronounced. Severe cases may develop viral pneumonia, secondary bacterial pneumonia and other complications, which can lead to death in severe cases. Infection with the H3N2 virus requires early isolation. For mild cases, patients need to be isolated at home, and adequate rest, close observation of changes in the condition, drink plenty of water, can not take drugs for the time being, for fever, runny and other symptoms, you can apply ibuprofen, etc. to relieve, usually within 2 to 3 days can be self-cured. Severe patients should be given anti-influenza virus treatment as early as possible, such as the use of antiviral drugs such as oseltamivir and zanamivir, to reduce complications, reduce morbidity and mortality, and shorten hospitalization time. The symptoms of the above infections require prompt medical attention to identify the cause and treatment under the guidance of a doctor, and should not be treated without authorization.