A booster shot is a booster shot of the new coronavirus vaccine, which can be given if the booster shot has not been given for more than eight months. A booster shot usually refers to the third dose of the inactivated New Crown vaccine. There is a minimum of six months between the second and third doses of the New Crown vaccine, so a booster shot can be given eight months after the second dose of the vaccine. The booster vaccination enhances the preventive effect of the vaccine. Six months after the second dose of vaccine, the antibodies to the virus in the human body will have decreased, and at this time, a booster shot of the New Crown Vaccine can once again increase the concentration of antibodies to more than ten times the level of antibodies, thus enhancing the preventive effect against the New Crown Virus. In addition, the booster vaccination will also result in a broader spectrum of antibodies, which will provide better protection against mutated strains. Patients should receive a booster vaccination as soon as possible, eight months after completing the program.