Question

how can a vaccine provide lifelong immunity

Answer 1

Explanation:

Polio provides life long immunity against polio.

Answer 2

Here your answer:

Once we've been vaccinated, if our immune system encounters the 'real' disease- causing germ, it responds quickly and creates antibodies and memory cells to give the body protection. Immunisation (vaccination) is the most effective preventative measure against serious diseases. Some vaccines offer lifelong immunity.

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