Various articles related to COVID19 and SARS-CoV-2.
Comparison of the clinical characteristics and mortality of adults infected with human coronaviruses 229E and OC43
229E was found to have a fatality rate, in those with severe enough disease to be hospitalized, of 25%. Yet, most of us are first exposed sometime in our youth, and therefore have a cold from it.
Why COVID-19 Is Here to Stay, and Why You Shouldn’t Worry About It
Rich article, well worth reading, lots of links, mentions the above 229E which has had many variants.
Sunlight and Vitamin D
Summary of everything on this topic.
Natural immunity vs vaccination
Necessity of COVID-19 vaccination in previously infected individuals
Not one of the 1359 previously infected subjects who remained unvaccinated had a SARS-CoV-2 infection over the duration of the study.