Perchance have you ever suffered through a cold virus? Conceivably did you heal from the cold? Certainly you recovered! You will not treat a runny nose directly, yet your body typically develops resistance to a certain cold infection within several days. That is called cured by your own immunity!Grownups have actually in the past had a lot of the rhinitis viruses. Adults have acquired immunity to the ones they have had. So there are not quite as many runny nose viruses around for parents to catch. That is why adults only get infected with a couple of colds each year whereas children get a dozen colds annually.