Is the third dose of COVID-19 vaccine valid for only half a year? Is it necessary to take COVID-19 vaccine for half a year

Is the validity period of COVID-19 vaccine only half a year?

Only half a year's data, not only half a year's protection.

According to the data released by the National Health Commission, at present, the antibody level of vaccinators has been monitored for more than 6 months, but this is because there are only half a year's data, which does not mean that the immunization only has these times, and the antibody is not the only indicator to measure protection. Therefore, the statement that COVID-19 vaccine can only protect for half a year is inaccurate, and the COVID-19 vaccine has come out for a short time, and there are many data that have not been studied, so the statement that COVID-19 vaccine can only protect for half a year is inaccurate.

Is it necessary to play COVID-19 vaccine with a validity of half a year?

It is necessary to play because the validity is not only half a year.

About the validity period of COVID-19 vaccine after vaccination, Wang Huaqing, chief expert of China CDC's immunization planning, said that COVID-19 vaccine is a new vaccine, which has been developed in a relatively short time and used in humans in a shorter time. Currently, through antibody level monitoring, it is estimated to be over six months. But antibodies are not the only protective indicator, and there are other factors at play during the process of vaccine action. Therefore, further research on the persistence of vaccines is needed to confirm how long their protection period is.

Zhang Yuntao, Vice President of Sinopharm Group China Biology, stated that throughout the entire clinical research process, we have observed that the vaccine protection duration is about six months, and the neutralizing antibody duration is also about six months. In our overall clinical design process, we have included booster shots to observe antibody persistence and protective levels. Preliminary results show that booster shots can effectively increase neutralizing antibody titers, enhance antibody persistence, and also improve the vaccine's ability to resist mutations. In the future, we will conduct three phases of clinical research overseas to continuously observe the antibody persistence and protective persistence of this vaccine. Is it necessary to administer booster shots? When will you come to fight? We still need to answer based on the results of the next three phases of clinical research.

Is the validity period of COVID-19 vaccine lifelong?

At present, it is uncertain.

Zeng Yixin, head of the vaccine research and development team of the State Council Joint Prevention and Control Mechanism and deputy director of the National Health Commission:

1. The virus was discovered less than a year ago, so it is too early for us to say how long this vaccine can protect, and we cannot draw this conclusion yet. 2. Current evidence suggests that there is basically no doubt that the vaccine protection period, as required by the World Health Organization, should be more than six months. As for whether the protection period can provide lifelong immunity like drinking multiple viral vaccines, or at least protect for five or ten years, it cannot be concluded yet.

Experimental data:

① Some animal experiments were conducted in February at the Institute of Medical Experimental Animals, Chinese Academy of Medical Sciences. At that time, after administering vaccines to monkeys, it was proven that the vaccine could indeed protect them. These monkeys are still alive today, so we can continue to attack them with viruses. Recently, we conducted some experiments to prove that vaccines have a protective effect. If it had been almost 9 months since February.

② In the Phase I and II clinical trials launched in March, many volunteers underwent clinical trials and have been followed up to test their antibodies, which still persist. Many medical institutions follow up with discharged rehabilitation patients to determine if their antibodies continue to exist after discharge. I learned that the first patient discharged from Shenzhen Infectious Disease Hospital was on January 23rd. After following up with more than 400 patients, they found that many patients still had antibodies for up to 10 months.

Will the COVID-19 vaccine not be infected again

Not necessarily.

Up to now, no vaccine has said that the protection rate has reached 100%, and only some high-risk people have been vaccinated. At present, mass immunization has not been established. In addition, the epidemic situation abroad is severe, and China is still in a high level of prevention. It is recommended that protective measures should be taken after COVID-19 vaccination to better prevent COVID-19. For example, don't go to places with too many people, don't touch public facilities casually, wear masks to go out, don't stay in a closed environment for a long time, ensure nutritious diet, exercise more, improve immunity, etc. are all ways to prevent COVID-19 infection, so as to better protect everyone's safety.