H3N2 is an influenza virus. On the surface of the influenza virus there is an envelope, which is mainly composed of matrix proteins, lipid bilayers and glycoprotein protrusions, which are composed of phytohemagglutinin and neuraminidase. Where H stands for phytohemagglutinin and N for neuraminidase. Influenza viruses are further categorized into influenza A and B viruses based on the antigenicity of the nucleoprotein and matrix protein. Based on the differences in the surface transmembrane glycoproteins of influenza A viruses, influenza A can now be categorized into 18 H subtypes (H1~H18) and 11 N subtypes (N1~N11). Human influenza is mainly composed of H1, H2, H3, N1 and N2 subtypes, including H3N2. After infection with H3N2 virus, you need to stay in bed, drink plenty of fluids, and take antiviral treatment under doctor’s supervision, such as neuraminidase inhibitors (e.g., oseltamivir, zanamivir) and other drugs. If secondary bacterial infection occurs during the infection, antibacterial treatment is also needed. The medication should be used under the supervision of a medical professional and should not be used on its own.