The quadruple vaccine is recommended to be given around 6 years of age at the latest. The quadruple vaccine mainly consists of the combined vaccine against DPT and the combined vaccine against Haemophilus influenzae type B (Hib). It can be used to prevent childhood infectious diseases caused by Haemophilus influenzae type B, as well as whooping cough, diphtheria and tetanus caused by pertussis bacillus, diphtheria bacillus and tetanus clostridium. The quadruple vaccine is usually given to children over three months of age and consists of three basic immunizations and a booster shot. Booster shots may be selected at an appropriate time depending on the child’s condition. The quadruple vaccine is usually given no later than 6 years of age. After vaccination, the quadruple vaccine stimulates the body to produce an effective humoral response and can produce the antibody components associated with the prevention of these diseases. When the body encounters these pathogens, it can effectively produce immune protection against infection. The quadruple vaccine is a free vaccine prescribed by the state. Children should be vaccinated as required. However, the Quadruple Vaccine may also produce some adverse reactions, so it is important to pay attention to observation after receiving the Quadruple Vaccine.