Booster shots are still necessary beyond 10 months and can also provide some protection. If it has been more than 6 months since the basic immunization vaccine was given, and the interval has reached 10 months, there is still a need for vaccination. Although the booster shot is not as effective as the basic immunization, the vaccine can still stimulate the immune system to produce antibodies after it enters the body, thus achieving a certain preventive effect. After 6 months of basic immunization, the titer and quantity of antibodies in the body gradually decrease, and the protective effect gradually deteriorates. Even after the established period of time, booster vaccinations can strengthen the antibodies in the body and reduce the rate of new crown infections and post-infection severe illnesses.