The third booster shot of the New Crown inactivated vaccine needs to be administered at an interval of six months or more from the second shot. After the first two injections of the New Crown inactivated vaccine, antibodies will be produced in the body of the vaccinated person, but along with the passage of time, the titer of the antibodies will decrease and the protective effect of the vaccine will be weakened. Therefore, the booster shot is administered after six months in order to raise the body’s antibody level, enhance its own immunity, and improve the protective effect of the vaccination. The third booster shot of the vaccine has the same rules as the first two shots, and some people may have fever and other reactions after the vaccination, which will usually recover on their own in 2~3 days. If you encounter persistent unrelieved adverse reactions after the third injection of the vaccine, the vaccinated person should immediately go to the hospital for treatment under the guidance of the doctor to avoid the occurrence of adverse events.