Jiffy vaccine generally refers to the Jiffy New Crown vaccine, while booster shot refers to the New Crown vaccine booster shot. As long as the vaccine recipient receives the full three doses of Jiffy vaccine, he/she does not need to receive the booster shot of the New Crown vaccine. Jiffy vaccine is one of the new crown vaccines approved for use in China, and is a recombinant subunit vaccine that requires three shots. The booster shot has the effect of boosting immunity, which can enhance the prevention of the new coronavirus. For those who have received the full three doses of Jiffy NeoCrown vaccine on time, a booster is not required at this time. Only adults who have completed six months or more of both the inactivated NeoCrown vaccine and the adenovirus carrier vaccine are eligible to receive the NeoCrown booster. If you meet the indications for a booster shot, it is recommended that you receive the booster shot in an orderly manner to protect yourself against new crown pneumonia. Note: In this article, the terms “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.