1. Why should COVID-19 vaccine be used to strengthen immunization?
At present, the global epidemic situation in COVID-19 continues to develop, and the spread of mutation in COVID-19 is accelerated, so the risk of imported epidemic situation in China is still high. Recently, there have been many local clustering epidemics caused by overseas imports, which fully shows that China's "external defense against imports and internal defense against rebound" is still under great pressure.
According to the research results at home and abroad, COVID-19 vaccine has played a great role in preventing infection and reducing the incidence. However, after vaccination, the immune protection will gradually weaken with the passage of time. In order to maintain a solid immunity, it is necessary to vaccinate again according to the immune characteristics of different vaccines. A number of clinical trials and global real research data show that after six months of complete vaccination of COVID-19 vaccine, the immunity of some recipients to COVID-19 decreased, and the probability of COVID-19 infection increased, so it is necessary to strengthen immunization.
2. What is the safety and effectiveness of COVID-19 vaccine booster?
From the existing observation and research, COVID-19 vaccine has a remarkable effect in preventing severe illness and death after the whole vaccination. However, after inoculation for a period of time, the immunity of some people decreased and the protective effect weakened. A booster vaccine can make this weakening "strongly rebound". According to some data, the antibody level increased by more than 10 times after the second dose of domestic inactivated vaccine was inoculated for half a year. The results showed that the antibody of inactivated vaccine in COVID-19 decreased in different degrees after 6 months, which was the same as that of conventional vaccine. After intensive immunization, the antibody level of the recipient will increase rapidly. After 14 days of intensive immunization, the antibody level was equivalent to the original 10-30 times. After 6 months, although the antibody level also decreased, it was still higher than the peak after two doses of inoculation or 1 dose, which could maintain a high level and had a good cross-neutralization effect on mutants such as Delta. The research shows that there is no significant difference in the types and probability of adverse reactions after booster immunization with COVID-19 vaccine compared with basic immunization. Vaccination with COVID-19 vaccine booster is safe and effective, so you can rest assured.