Currently, the Pfizer New Crown Vaccine injection dose is usually three injections. The Pfizer NeoCrown vaccine, a vaccine developed and administered by Pfizer in the U.S. to prevent a new type of coronavirus pneumonia, has so far been administered in three injections, with the third injection being a booster. According to the latest reports, a fourth injection, the second booster, may be added in due course. At present, the main vaccines approved for vaccination against the new coronavirus pneumonia in China are Beijing Biological Inactivated Vaccine (BIV), Wuhan Biological Inactivated Vaccine (WBIV), Beijing Coxing Inactivated Vaccine (BCIV), Shenzhen Kangtai Inactivated Vaccine (SZCIV), and so on, and there is no promotion of the vaccine developed by Pfizer. No matter which vaccine you receive, it can play a certain preventive role. It should be noted that after vaccination, it is necessary to observe for half an hour before leaving. And the prevention of new crown pneumonia can not rely entirely on the role of the vaccine, the daily need to wear a mask, wash your hands more often ventilation. [Tip] This article refers to “new coronary pneumonia, new coronary virus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to “new coronary virus infection”.