The interval between the first and second doses of the new crown inactivated vaccine is 21 days. At present, there is no specific drug for the new coronavirus and vaccination is still a more effective way of prevention. Generally speaking, the inactivated vaccine against the new coronavirus pneumonia is divided into three shots, with the first and second shots taken at an interval of 21 days, and the third shot is a booster shot, which needs to be taken at an interval of six months from the second shot. The interval between the first and second doses of the new coronavirus pneumonia vaccine can be greater than 21 days, but not shorter than 21 days. It is important to note that you should be in good health at the time of vaccination, and if you have fever, cough, or other discomforts, inform your doctor and postpone the vaccination program. In addition, there is no booster injection for children aged 3 to 12 years, and the interval between the first and second injections for children is the same as that for adults. Tip: “New coronavirus pneumonia and new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.