The interval between New Crown vaccinations needs to be determined depending on the manufacturer and type of New Crown vaccine being administered. Whether the interval between New Crown vaccines is 14 days or 28 days is possible. For example, the interval between each dose of New Crown vaccine developed by Beijing Kexing Biologicals is 14 days; the interval between vaccinations developed by Sinopharm is 21 days; and the New Crown vaccine developed by the Institute of Medical Biology of the Chinese Academy of Medical Sciences requires an interval of 28 days and has a total of three vaccination schedules. The reason for the different intervals and number of doses for the vaccine against New Crown is that the development of the New Crown vaccine was carried out simultaneously by several research institutes and produced results separately. Therefore, a variety of New Crown vaccines effective against New Crown virus were produced. During the anti-epidemic period, the public demand for vaccines was urgent and the production of vaccines by a single institute was not sufficient to cover all the population, so multiple New Crown vaccines were approved for production. However, no matter which neo-crown vaccine is used, it is immune to the neo-crown virus, and this is the conclusion from numerous clinical trials. Trust the health care provider who administered the vaccination to you, keep in mind the precautions, and do not take the word of others at face value; after all, everyone’s situation is not necessarily the same. If the interval has been forgotten, it is only accurate to call or visit the original vaccination site to inquire.