The third dose of coronavirus vaccine is not available for the time being for those under 18 years of age. The conditions for the third dose of the vaccine are that people are 18 years of age and older and have completed two doses of inactivated vaccine. The third dose of New Coronavirus Pneumonia Vaccine actually refers to a booster dose of New Coronavirus Pneumonia Vaccine, which is a supplementary dose administered after the completion of vaccination to maintain the body’s immunity against the virus according to the disappearance of antibodies. For example, at this stage, the inactivated New Coronavirus vaccine is inoculated with 2 shots throughout the course of the vaccination, based on the decline in the level of antibodies in the human body, and then the shots are inoculated. According to our country’s “New Coronavirus for Vaccination Information Technology Development Guidelines (First Edition)”, the third shot of recombinant related protein New Coronavirus vaccine should be available within six months of China’s first shot, four weeks of the second shot as well as later, and the inoculation part of our third shot is still the deltoid muscle of the upper arm. However, the conditions for the third dose of the new Crown pneumonia vaccine are that people 18 years of age and older have completed two doses of inactivated vaccine and the second dose is six months old. Therefore, it can be known that people under 18 years of age cannot be vaccinated for the time being. Tip: The terms “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.