And sure you will eventually get infected by a different runny nose virus, due to the fact that there remain more than 300 various runny nose viruses. But you will certainly unlikely get the same cold infection that you had before due to the fact that you have developed immunity to it.

Adults have in the past had a lot of the cold infections. Grownups have actually created resistance to the ones they have suffered from. So there are not lots of runny nose viruses remaining for grownups to catch. That is why adults just acquire a few runny noses annually whereas children may get 10-12 colds each year.
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