And sure you will eventually cave in to a different runny nose virus, since there exist more than several hundred various cold viruses. But you will never acquire the very same cold virus that you had before because you have actually created immunity to that particular cold virus.

Adults have in the past had a great deal of the cold infections. Grownups have actually created immunity to the ones they have actually suffered from. So there are not as many runny nose viruses existing for grownups to acquire. That is why adults just get a couple of colds each year whereas children acquire 10-12 runny noses each year.
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