Why should COVID-19 vaccine be given twice? When is the second injection of COVID-19 better

Why should COVID-19 vaccine be given twice

COVID-19 vaccine is mostly an inactivated vaccine, which injects the inactivated micro virus into the human body, so that the human T lymphocytes and B lymphocytes can recognize it, generate immune memory, and produce antibodies, thus playing the role of resisting specific disease viruses.

After 14 to 28 days of the first injection of COVID-19 vaccine, the antibody positive rate can reach about 60% -90%, that is, there is a 60% -90% chance to start to protect the human body. At this time, re injection of COVID-19 vaccine can effectively improve the probability of successful antibody generation, and can also avoid adverse reactions caused by one-time massive injection of virus.

When to take the second dose of COVID-19 vaccine

The recommended immunization procedure for domestic COVID-19 vaccine is generally to inject twice, and the injection time between two doses of COVID-19 vaccine should be at least two weeks apart. The recommended interval is 14 to 28 days. It is better to inject the second time every 28 days.

Although COVID-19 vaccine is an inactivated vaccine, it is still necessary to observe whether the human body will have adverse reactions. Too frequent injections may cause drug reactions, which is not conducive to maintaining the protection of the vaccine, and may also affect the health of the body.

Conclusion: Why should COVID-19 vaccine be administered twice? This is because COVID-19 vaccine, as an inactivated vaccine, can resist the virus by making the human body produce specific antibodies. A single injection cannot ensure that the human body produces 100% antibodies, but two standard injections can effectively improve the protection of the vaccine to the human body.

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