In the case of the booster shot for the Xin Guan inactivated vaccine it will take more than 6 months, and in the case of the third shot for the Anhui Zhi Fei vaccine it will be between 4 weeks and 6 months. If the consultation is for a booster shot of inactivated vaccine, it is necessary to complete the first two shots and reach a time interval of 6 months before the third shot can be administered. If the antibody level is still high before 6 months, no vaccination is needed, and after 6 months the antibody level starts to decrease and a booster shot is needed. In the case of the third dose of Anhui Zhifei vaccine, the interval between doses should be more than 4 weeks and the vaccine should be given at less than 6 months of age. Therefore, special attention should be paid to the fact that if the vaccine is administered after 6 months, the effect of the vaccine may be affected.