And definitely you will eventually cave in to a different cold virus, because there are more than 300 different runny nose infections. But you will certainly never get the exact same runny nose infection that you had in the past because you have established immunity to that cold virus.

Adults have previously had a lot of the cold infections. Adults have actually established immunity to the viruses they have actually had. So there are not quite as many cold infections around for adults to become infected with. That is why grownups just get infected with a few colds annually and youngsters get a dozen runny noses each year.
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