> Note that those other "common cold" coronaviruses can still be quite deadly to immunocompromised or frail elderly patients. The only reason they aren't killin

> Note that those other "common cold" coronaviruses can still be quite deadly to immunocompromised or frail elderly patients. The only reason they aren't killing people on the same scale as COVID-19 is that most of us get infected as youths and build up some natural immunity that protects us as we age. Correct, IIRC the 4 circulating coronaviruses cause just 20% of respiratory infections, but 70% of deaths. The severe illness and death is almost all in the elderly and compromised.