Last thread is well over 1000, so taking this here. So, and just speculation on my part here as I'm not a virologist, but the big thing with the common cold is that it's caused by a multitude of viruses. Rhinovirus strains are the most common but the big reason it's basically impossible to create a vaccine for is that there are any number of viruses that could cause it to begin with. What gives me some hope with Covid 19 is that Covid is related to SARS which, aside from accidental exposures in a laboratory setting, there have been no reported cases of since 2004. That virus was far easier to control since it was far more deadly and immediately obvious when someone had it. What gives me hope is that after SARS burnt out that was basically it, it's done with.