Herd immunity, to my knowledge, has never developed for the common cold, because there are several hundred viruses responsible and they're rather changeable. The general approach, as I recall it, was, "we can't do anything about it, but it doesn't kill too many people, and those at risk can get flu and pneumonia vaccinations."

And herd immunity for measles is due to vaccination. If measles were a novel disease, you would be seeing lockdowns that make San Quentin look open and free.