And definitely you will possibly succumb to one more runny nose virus, because there are 300 different runny nose viruses. But you will never get the exact same cold infection that you had in the past since you have created resistance to that particular virus.

Grownups have already had a lot of the cold viruses. Adults have created resistance to the colds they have had. So there are not lots of cold infections around for parents to acquire. That is why parents only get a few runny noses per year and children get a dozen colds per year.
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