And sure you will eventually get a different cold, since there exist several hundred various cold infections. But you will unlikely get the same runny nose infection that you had previously because you have developed immunity to that particular cold virus.

Grownups have actually previously had a lot of the cold viruses. Parents have actually developed immunity to the ones they have actually suffered from. So there are not lots of runny nose infections remaining for grownups to become infected with. That is why grownups only get a few colds each year whereas youngsters usually get a dozen colds each year.
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