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By any chance have you formerly endured a cold virus? By chance did you heal from the issue? Of course you did! You can't heal a runny nose directly, nevertheless your immune system generally establishes immunity to any type of cold infection within several days. That is called cured by your personal immunity!
Grownups have currently had a great deal of the cold viruses. Adults have established immunity to the ones they have suffered from. So there are not as many cold viruses remaining for adults to catch. That is why grownups just get a couple of colds annually whereas kids usually get 10-12 colds each year.
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