After the 2 doses of Kokumin New Crown Vaccine, if the Kokumin Vaccine is out of stock or for any other reason, the Koxing Vaccine can be given again under the supervision of a physician. Both Sinocoronazole vaccine and Koxing Sinocoronazole vaccine are inactivated vaccines. After two doses of Sinocrown vaccine, it is recommended to continue to use the original vaccine type and brand; if the Sinocrown vaccine is out of stock or for other reasons, you can try to choose a vaccine of the same technical route, such as the Koxing vaccine, as the third booster vaccination under the guidance of the doctor at the vaccination site, which will not affect the effectiveness of the vaccination in general. After receiving the booster shot of Xin Guan vaccine, a small number of people may experience local redness, swelling and pain at the injection site, etc. On the day of vaccination, pay attention to the injection site not to get wet, and keep the injection site dry and clean, which can avoid causing skin infections. If there is any special discomfort, it is recommended to consult a doctor in time.