For the time being, a booster shot is not required after three shots of Zhifei vaccine. At present, the new vaccines that require booster shots are the inactivated vaccines of Sinopharm Zhongsheng Beijing Biological Institute, Beijing Kexing Zhongwei Biological Company, Sinopharm Zhongsheng Wuhan Biological Institute, and the adenovirus vector vaccine of Tianjin Kangxinuo Company, which require booster shots to maintain the effective concentration of antibodies in the body. The Zhifei vaccine itself is a three-dose vaccine, and after the full course of vaccination, its antibody concentration is still relatively high, so there is no need for a booster shot for the time being. It is recommended to pay attention to the announcements of the local CDC or vaccination centers, or call the relevant departments for clarification, and get vaccinated in a timely manner when needed. You should pay attention to your daily protection, wear a good mask when you go out, and try not to go to areas where there is an outbreak.