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There are a handful of illnesses one can only contract once, including the mumps, chicken pox, and mono.

After fighting of a sickness once, your immune system knows how to kill it and can automatically do away with it the next time you are exposed. The reason you can get the cold and the flu more than once is because they are two illnesses that are constantly mutating, making it impossible for your immune system to "memorize" how to defeat them.

Hope that helped.

~{Insomniac Platypus}~

This is incorrect, mumps and chicken pox you can both have more than once. It is rare for this to happen, but it can happen.

This is in high part true but then again I am one of the current people who have suffered the mumps more than once. In fact, I currently am.

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15y ago

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