1. Why can you keep getting the common cold when you can get the mumps only once? 2. What are some things you can do to improve your immune system to help fight infections?

Once a person has developed mumps they remain immune to that disease for the rest of their lives. Therefore if they come in contact with the virus again their immune system recognises the virus and eradicates it. To improve your immune system you can eat healthy and exercise often.

Explanation:

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