How is vaccine helpful to prevent the occurance of disease?

1.	How is vaccine helpful to prevent the occurance of disease?
Answer» ines contain a microorganism or VIRUS in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's ADAPTIVE immunity, they help prevent SICKNESS from an infectious disease. When a sufficiently large percentage of a POPULATION has been VACCINATED, herd immunity results.

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