Influenza vaccines approved for marketing in China include trivalent inactivated influenza vaccine, tetravalent inactivated influenza vaccine and trivalent live attenuated influenza vaccine, which can be selected according to the age as well as the actual situation. 1. Trivalent inactivated influenza vaccine: Trivalent inactivated influenza vaccine can prevent three kinds of influenza, Influenza A H1N1, H3N2, and Victoria BV, and it is suitable for people above the age of six months. 2. Quadrivalent inactivated influenza vaccine: This vaccine can prevent four kinds of influenza, in addition to influenza A H1N1, H3N2 and Victoria BV, it can also prevent Yamagata B BY, and it is suitable for people aged 3~17 years old to be vaccinated. 3. Trivalent live attenuated influenza vaccine: The three types of influenza prevented by this influenza vaccine are the same as the trivalent inactivated influenza vaccine, and people above 36 months of age are its applicable population. It is generally recommended that children, the elderly and people with chronic underlying diseases or those with weak immunity should receive influenza vaccination in time during the influenza epidemic season. If you need influenza vaccination, please consult the local CDC or regular hospitals to choose the appropriate influenza vaccination to avoid adverse consequences.