Influenza A (H3N2) can be prevented by vaccination, as well as by maintaining healthy habits and taking good personal precautions. To prevent influenza A (H3N2), vaccination is a more effective way. Currently, the commonly used vaccines are trivalent inactivated vaccine (available for people aged 6 months and above), trivalent live attenuated vaccine (available for people aged 3-17 years old), and tetravalent inactivated vaccine (available for people aged 3 years old and above). In addition, in daily life, you should also do a combination of work and rest, do not overwork, so as not to reduce the body’s immunity. You should do some exercise, such as jogging and swimming. Indoors should be ventilated every day, develop good personal hygiene habits, wash hands frequently, and try to wear a mask when going to crowded places.