Quadrivalent encephalitis vaccine is necessary for elementary school students. Quadrivalent encephalitis vaccine is mainly used for the prevention of epidemic cerebrospinal meningitis (ECM). Since the disease is mainly transmitted through the respiratory tract and the mortality rate of outbreaks of ECM is relatively high, and since elementary school students are usually aged 6 years and above, vaccination with quadrivalent encephalitis vaccine has a better protective effect. Therefore, it is necessary for elementary school students to receive quadrivalent influenza vaccine. If the child is suffering from acute illness or fever, etc., it is also necessary to postpone vaccination to avoid serious adverse reactions. Meanwhile, some children may have adverse reactions such as pressure and pain at the injection site, redness, etc. after vaccination, and a few patients may also have transient fever, which usually does not require special treatment. If the child’s fever exceeds 38 ° C, it is also necessary to take antipyretic measures, such as warm water to wipe the whole body, and if the child has abnormalities, it is also necessary to consult a doctor in time and treatment. Parents are advised to immunize their children in elementary school with the quadrivalent influenza vaccine in a timely manner and pay attention to its related matters.