隻能說你對疫苗的理解不夠全麵。看wiki

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.^[1] A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future. Vaccines can be prophylactic (to prevent or ameliorate the effects of a future infection by a natural or "wild" pathogen), or therapeutic (to fight a disease that has already occurred, such as cancer).^[2][3][4][5] Some vaccines offer full sterilizing immunity, in which infection is prevented completely.^[6]

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• Wiki裏的東西經常改動，不能作準。 -VioletSky- ♀ (0 bytes) () 12/29/2021 postreply 10:50:28

• 就是 -MayX- ♀ (0 bytes) () 12/29/2021 postreply 13:15:10