Is it necessary to get a third dose of COVID-19 vaccine?

A third injection is definitely needed.

1 We must first understand what a booster needle is.

The so-called booster needle refers to supplementary vaccination according to the fading of antibodies after vaccination to maintain human immunity to the virus. This practice is more common in the vaccination of common infectious diseases such as hepatitis B and influenza.

According to the information of the World Health Organization (WHO), the current protection period of COVID-19 vaccine should be more than half a year, after which the antibody may obviously fade.

The first batch of COVID-19 vaccinators in China have been vaccinated for nearly half a year. Shao, a researcher at China CDC, said that at first glance, about half of this group of people? The antibody level is ok? . Monitoring data on a larger scale are being studied. With the support of scientific data, we will determine when people who have been vaccinated and those who have been vaccinated for a long time should be vaccinated. .

Is it necessary to strengthen the needle?

Strengthening needles can make vaccinators produce antibodies quickly. Yin Weidong, chairman of Kexing Holding Biotechnology Co., Ltd. said that three volunteers had finished two doses of Kexing inactivated vaccine? Six months later, the third injection. Antibodies can jump to 10 times a week and 20 times in half a month? .

The following is an expert's summary of strengthening needles:

1. Although the antibody is weakened after several months of routine inoculation (two doses), the immune memory still exists.

2. Two doses of inoculation have poor defense against Delta strain, and three doses can effectively prevent the epidemic.

3. The inoculation time is six months after the second dose, and the effect lasts for nine months.

Someone will definitely ask why the booster shot is not compulsory.

As far as the safety of the vaccine is concerned, the benefits and safety of the booster of COVID-19 vaccine are uncertain, and the booster is still in the clinical trial stage. It will take time to prove whether it has greater immunity to COVID-19.

Therefore, for COVID-19, we should give priority to prevention. Don't think that just because you have been vaccinated with COVID-19 vaccine, you feel that you have the protection against COVID-19, which weakens the protection against the virus and may allow new mutated viruses to enter. Vaccination is not only to protect yourself, but also to be responsible for others.

Finally, I have to explain that vaccination is actually everyone's business. If most of us are vaccinated, the virus will be difficult to spread, and the epidemic will be easier to control and put out, otherwise the virus will spread more easily. China has the best epidemic control in the world. At present, 2.9 billion doses of vaccination have been completed nationwide. Despite the ups and downs of the global epidemic and the increased infectivity of virus variants, vaccination is still an effective means.