The Hong Kong government announced that it will implement the new crown vaccine booster on November 11, and many countries around the world are also implementing the same plan.
Why do they do this?
Does it have any effect on today's new crown epidemic, which is dominated by variant viruses?
The so-called booster refers to an additional injection of vaccine to strengthen the body's "memory" of bacteria or viruses.
After the human body is injected with the first shot of the vaccine, the body will produce antibodies, and the second shot of the vaccine will make the body produce more antibodies and enhance immunity to the new coronavirus.
Antibody levels will gradually decrease over time. In the face of the epidemic that has not dissipated and a variant virus strikes, the antibody level can be raised again by vaccinating.
The picture shows a picture of Pfizer/BioNTech and Modena packaged vaccines printed on March 19th.
(Reuters)
In the Hong Kong children’s vaccination program, some of the vaccines for diphtheria, tetanus, whooping cough, and polio are more than twice. For example, many of the vaccines given in primary schools are boosters.
The booster can be the exact same vaccine, or it can be a similar vaccine against a variant virus.
Therefore, for the new coronary pneumonia variant virus, an extra dose of vaccine against the variant is useful.
If the vaccine given is the same as the one given earlier, the body's increased antibodies may still not be able to effectively resist the invasion of the mutant virus.
But because antibodies only reduce their effectiveness rather than become completely ineffective, vaccination with the same vaccine can still play a defensive role, or reduce the chance of worsening the disease after the unfortunate infection.
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As to whether vaccines should be "ditched" and mixed, different experts have different opinions, and some believe that they should not be ditched, because the need for mixed vaccines has not been considered in the vaccine development process.
At the same time, the popular vaccines on the market are manufactured using different technologies, and it is not known what effects, especially side effects, can be caused by mixing.
Some foreign clinical studies have shown that the groove needle injection booster can improve greater protection, and there is no particular increase in side effects.
The US Food and Drug Administration also approved groove injection, that is, people who were originally vaccinated with Johnson & Johnson vaccine can choose to choose Pfizer/BioNTech or Moderna vaccine when receiving booster doses.
