Antibodies do not remain in the body for a long time after vaccination.
The new crown vaccine can stimulate the body to produce effective protective antibodies, but these protective antibodies have a certain period of validity, and with the extension of time, the potency of the antibodies will gradually decrease, and they are not effective for a long time.
The booster shots are mainly for those who have received two doses of inactivated vaccine and one dose of adenovirus vector vaccine, and the effectiveness of the vaccine starts to decline after 6 months. For those who received the three-dose recombinant subunit vaccine, the number of antibodies in the body remains at a high level at this point in time, and therefore a booster shot is not required for the time being.