And definitely you will eventually acquire one more cold virus, because there exist several hundred different runny nose infections. But you will never get the same runny nose infection that you had in the past because you have developed immunity to that cold virus.

Parents have actually previously had a lot of the rhinitis viruses. Parents have developed resistance to the viruses they have suffered from. Therefore there are not so many cold infections remaining for adults to become infected with. That is why grownups just get infected with a few colds annually whereas youngsters acquire a dozen colds each year.
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