At present, we have not specified whether the fourth dose of the new coronavirus vaccine is required, and the exact timing of the vaccination is still uncertain. Although the recombinant Neocoronavirus vaccine for inhalation is a new type of vaccine introduced after the third booster shot, which is also used for booster immunization, it is not the fourth vaccine, or the second dose of booster immunization. Currently, the common form of vaccination consists of three doses of inactivated vaccine, with the first and second doses as normal vaccination and the third dose as booster, but the need for a fourth dose is still under study. At present, the New Crown Pneumonia Virus is still in a state of flux. Although protected by the vaccine, it is still important to wear a mask when going out, wash your hands frequently, and avoid going to crowded places. If you experience fever, cough or other symptoms, you should seek medical attention immediately. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.