Why is it not recommended to test for COVID-19 antibodies?

Recently, some netizens put forward suggestions on the message board of the leaders of People's Daily Online, hoping to conduct antibody testing for people who have been vaccinated as soon as possible, and reseed those who have not developed antibodies after vaccination

At the press conference of the Joint Prevention and Control Mechanism of the State Council, Zheng Zhongwei, the leader of the Vaccine Research and Development Team of the Joint Prevention and Control Mechanism of the State Council, and the director of the Center for Medical Science and Technology Development Research of the National Health Commission, responded that there are indeed many people who are worried about vaccination.

Vaccine protection, in addition to neutralizing antibodies, mainly depends on immune memory

Zheng Zhongwei said that the results of clinical trials have shown that the new coronavirus vaccine has strong immunogenicity

"After we were vaccinated, the antibody level gradually decreased, which is a natural response of the human immune system

For example, Zheng Zhongwei said that many friends may have been vaccinated with a series of vaccines when they were young

How can neutralizing antibodies be judged to be effective?

So, how can neutralizing antibodies be judged to be effective? Zheng Zhongwei introduced that to determine whether the neutralizing antibody can neutralize the new coronavirus, it is necessary to neutralize the live virus by collecting the serum of the vaccinators in the P3 laboratory, so as to determine whether the neutralizing antibody has a virus neutralizing effect

"In history, we have been vaccinated a lot, but this time the new coronavirus vaccine was vaccinated against the background of a global pandemic

He finally emphasized that to judge whether a vaccine is effective, it is mainly through the preliminary clinical trials and the later stage based on the real-world study of the large-scale epidemic, and the level of neutralizing antibodies cannot simply be used to determine whether the vaccine is effective.