And of course you will probably succumb to a different cold, since there remain more than several hundred various cold viruses. Yet you will never get the very same cold infection that you had in the past since you have established resistance to that particular virus.

Adults have previously had a lot of the cold viruses. Grownups have acquired resistance to the colds they have had. So there are not quite as many cold infections remaining for adults to acquire. That is why parents just acquire a few runny noses per year whereas youngsters usually get 10-12 colds annually.
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