In the context of a new round of outbreaks, targeting key population groups, many places have been launched the new crown vaccine "strengthening needle" vaccination work.

In response to some people's concerns about adverse reactions after the third shot of the new crown vaccination,Experts say the side effects are small and don't worry too much. Can the third and first two new crown vaccines be mixed? Zhai Yiming, a member of the special expert group on vaccine research and development of the joint prevention and control mechanism of the State Council, said that the third injection of the same type of vaccine is still recommended.

Before some netizens asked, why the new crown vaccine can not be a needle tube for a lifetime? The new coronavirus is concentrated in the respiratory tract and lungs and cannot produce antibodies like smallpox, which can be repeated once, He explained. And the smallpox vaccine is a live vaccine that continues to stimulate the immune system;

Does the home-grown inactivated vaccine protect against new coronaviruses, especially Delta strains? How effective is the injection "reinforced needle"? Xu Kaifeng, director of respiratory medicine at Beijing Concord Hospital, responded to these questions in an interview with the media.

At present, the effectiveness of the new crown vaccine "enhanced needle" can last at least 9 months, the future of the new crown vaccine may need to be vaccinated annually, according to the mutation of the vaccine strain.