And sure you will eventually cave in to another cold, since there exist more than several hundred various cold infections. Yet you will never ever get the same cold virus that you had previously due to the fact that you have created resistance to that cold virus.

Parents have in the past had a lot of the rhinitis viruses. Grownups have acquired resistance to the ones they have had. Therefore there are not quite as many cold viruses around for parents to catch. That is why parents just get infected with a few runny noses each year whereas kids usually get 10-12 runny noses annually.
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