Completion of the third booster is relatively less likely to result in infection and reduces the likelihood that infection will lead to severe illness, but it is not 100% preventable. If the third booster is completed, the probability of infection can be significantly reduced. The vaccine enters the body and stimulates the immune system, which produces antibodies that can prevent infection. And the role of the new crown vaccine is through a large number of tests and clinical data to prove that in the new crown prevention effect is remarkable. According to the experience of a large number of new crown vaccination, the probability of people who received booster shots to become seriously infected even after infection is significantly lower than that of people who did not receive the vaccine. Therefore, it is recommended to complete the vaccination as early as possible, both from the point of view of self-protection and from the point of view of the corresponding epidemic prevention policy. However, vaccination does not mean that 100% of the people will not be infected, there is still a possibility of infection, and you should pay attention to daily protection.