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And definitely you will eventually get infected by another runny nose virus, because there exist 300 various runny nose viruses. However you will certainly unlikely acquire the exact same runny nose virus that you had before since you have actually created immunity to that particular virus.

Adults have in the past had a lot of the cold viruses. Parents have developed immunity to the ones they have suffered from. So there are not numerous runny nose infections around for adults to become infected with. That is why grownups just get infected with a few runny noses per year and children may get 10-12 colds per year.