No doubt you will most likely get infected by one more cold, because there are several hundred different runny nose infections. But you will certainly never acquire the same runny nose virus that you had in the past since you have developed immunity to that virus.Parents have in the past had a great deal of the cold infections. Parents have acquired immunity to the viruses they have actually had. So there are not quite as many runny nose infections remaining for adults to catch. That is why grownups just get a couple of colds per year and kids usually get a dozen colds per year.