How long is the validity period of two shots of COVID-19 vaccine? Experts from China Center for Disease Control and Prevention responded

At present, many people will go to the health center to get COVID-19 vaccine. COVID-19 vaccine needs two shots. The time interval between the first shot and the second shot is long. In order to make the validity of these two shots reach the optimal state, people need to pay attention to the interval between the two shots. How long is the validity period of China's COVID-19 vaccine after two shots? Let's learn about related issues together.

How long is the validity period of two injections of COVID-19 vaccine in China

After COVID-19 vaccine is injected, the protective effect shall be at least six months. According to An Zhijie, deputy director of the Immunization Planning Center of the China Center for Disease Control and Prevention, because COVID-19 is also a very new virus, the existing data shows that after COVID-19 infection, COVID-19 rarely occurs within six months. But that doesn't mean he won't have protection after six months, it's just that there isn't any longer observation data yet. So our suggestion is temporary. If he has a need and is fully informed, he can receive another dose, which is the same as the internationally accepted recommendation. At present, it is preliminarily estimated that the validity period of COVID-19 vaccine is more than half a year as required by WHO, and there is basically no doubt.

Due to the short time of virus discovery and incomplete clinical data, it is too early to say how long the COVID-19 vaccine can be protected, and it is still impossible to draw a conclusion. Moreover, the validity period of COVID-19 vaccine has not been specifically announced by the country; It is uncertain whether there will be significant mutations in the later stages of the virus, and continuous attention and research are needed. Optimistically, the current variation of the virus is within a normal range, and its impact on vaccine efficacy has not been observed. Therefore, the conservative estimate of its validity period is around six months. Whether vaccination is needed in the future will be adjusted according to policies and virus changes.

Difference between three and two doses of COVID-19 vaccine

At present, there are four COVID-19 vaccines listed in China, but there are two types of vaccines, one is inactivated vaccine, the other is adenovirus vector vaccine. If you ask the difference between single and double injections of COVID-19 vaccine, you are actually asking the difference between inactivated vaccine and adenovirus vector vaccine. The difference in vaccine production process is that inactivated vaccines are the traditional classic vaccine form, while adenovirus vector vaccines belong to the vector vaccines in the new vaccine category. The difference of action form is that the inactivated vaccine is to kill and purify the COVID-19 cultured in vitro after culture and amplification. The inactivated virus has no pathogenicity, but it can still stimulate the immune response of the body. At this point, inactivated virus particles are injected into the human body to induce an immune response. The adenovirus vector vaccine is like a car carrying a cargo of "COVID-19 antigen gene". After it is delivered to human cells, the "COVID-19 antigen gene" can neither replicate itself nor cause disease, but can express the protein antigen of COVID-19 and stimulate the immune system of human body to produce antibodies.

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