It seems like you know more than I do -- that's good news, thank you for correcting me! I was wrong about coronavirus causing all forms of the common cold. They only cause 15%, whereas rhinoviruses as you say, cause 30–80%.

Still, "the Coronavirus" COVID-19 causing virus is an RNA virus correct? Those mutate rapidly & in fact, evading immune systems via rapid evolution, is part of what has allowed RNA viruses to exist & thrive.

This fact of being an RNA virus, might be one reason that making a vaccine is difficult & that long term immunity is in question: https://en.wikipedia.org/wiki/RNA_virus#Mutation_rates

> Preliminary analysis of COVID-19 indicates that catching it once is likely to confer life-long immunity.

I wasn't able to find this in your links. Regardless, I hope that is the case.