Why the third shot of COVID-19 vaccine?

Everyone knows that COVID-19 vaccine is the best way to prevent and control the epidemic. Our country basically vaccinates two doses of inactivated vaccine, and now many places have begun to vaccinate the third dose of booster, so why should we vaccinate the third dose of COVID-19 vaccine? Now I'd like to introduce the cause of the third injection of COVID-19 epidemic, and let's have a look at it with interested friends.

Why do you need to strengthen the injection?

The reason why we need to get a booster shot is that after vaccination, the immunity and protective effect will decline over time, and it is easy to get infected with the virus. After inoculation, the protective effect will rebound, thus achieving better protective effect.

That's why the third dose of COVID-19 vaccine was introduced. I hope it will help everyone.