The H3N2 virus is a subtype of influenza A. There is a general lack of immunity to the virus in the population, and it can spread rapidly in the population. H3 refers to the hemagglutinin subtype and N2 refers to the viral neuraminidase subtype of influenza A. The H3N2 variant is formed by reassortment of swine-origin influenza A (H3N2) viruses with influenza A (H1N1) viruses, and has a greater ability to spread among humans, but most patients have mild disease. Most of the patients infected with the H3N2 subtype had a history of direct or indirect contact with pigs, and most of them had visited places where pigs were present, and presented with an acute onset of illness, fever (high fever up to 39~40°C), respiratory symptoms such as sore throat, cough, and nasal congestion, as well as systemic symptoms such as headache and fatigue. Considering that this type of influenza is more closely related to pigs, it is recommended to logistically wash hands with soap and running water before contacting pigs, avoid eating or drinking water in areas where animals are active, and avoid going to places where people gather during the influenza epidemic season. Appearance of the above influenza symptoms promptly seek medical attention.