The fourth dose of COVID-19 vaccine has arrived. Is the previous vaccine still useful?

The fourth dose of COVID-19 vaccine has arrived. Is the previous vaccine still useful? An article was published online through the weekly report of CDC. First, we should have the confidence and strength to end the COVID-19 epidemic. The article also affirmed my achievements in epidemic prevention and control in the past two years with a large number of data, and pointed out that vaccine is still the key factor to end the epidemic in COVID-19. If necessary, we need a second booster shot, which is the fourth shot. You have to ask here, and you need a fourth injection. Listen to me first and explain it to you quickly.

First of all, the article points out that vaccination can protect 90% people now, but the last 65,438+00% is the most difficult to achieve in any vaccination process, but in previous statistics, the last 65,438+00% is also a crucial prerequisite for protection, because most of them have complications. For example, many of us are elderly people, and if we are infected, we will suffer the most. Obesity, hypertension, diabetes, cardiovascular and cerebrovascular diseases, diseases, kidney diseases and malignant tumors are all risk factors, among which obesity prediction is the most important factor, but it is an arduous task for our populous country to protect everyone. Although two shots of vaccine were given at first, after a few months, everyone's protection was weakening.

Continuous vaccination is mainly because the virus has mutated and lost some protective functions. According to statistics, China has been vaccinated more than 30 times, and all vaccines are related to extremely rare severe allergic reactions. Besides, they don't have any serious security problems. In the study of vaccine safety in Hong Kong, it was found that the risk of adverse events of special concern did not increase, regardless of whether the vaccinated person was over 80 years old or not and whether there were complications. So we took Jilin, Henan and Hong Kong for research, and the results showed that the effective rate of vaccination was only 70% when the vaccination was not strengthened, and it increased to 98% after the vaccination was strengthened.

The research results in Hong Kong are similar, which gives us confidence in the use of vaccines and emphasizes the importance of strengthening doses. Finally, combined with the above data, the previous vaccine will weaken the preventive effect with the variation of the virus, but it is still useful. For the sake of safety and long-term protective effect, a timely second booster dose, that is, the fourth dose of vaccination, is definitely needed.