If you have had the mumps once,you cannot get them again.This is an example of natural active immunity.

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Quizplus · Accepted Answer

Natural active immunity occurs when the body produces its own antibodies in response to a natural infection, and this results in long-lasting immunity to that specific pathogen. In the case of having the mumps once, the body produces antibodies that protect against future infections of the same virus, thus providing natural active immunity.

If You Have Had the Mumps Once,you Cannot Get Them