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By any chance have you once endured a cold virus? By any chance did you recover from the virus? Naturally you survived it! You won't heal an acute rhinitis itself, yet your body usually establishes resistance to a certain cold virus within several weeks. We call that treated by your personal immunity!

Grownups have actually already had a great deal of the runny nose viruses. Parents have created resistance to the viruses they have actually had. So there are not as many runny nose viruses remaining for grownups to catch. That is why parents just get a few runny noses annually whereas children may get a dozen colds each year.
https://www.instapaper.com/read/1610780525