It is not surprising at all that Covid-19 matches what we already know about Vitamin D and Influenza. There are consequences for radically altering the environment in which humans evolved. We were nude outdoors and now we are clothed and indoors. When we do briefly go outside, we are all conditioned to slather on sunscreen, which blocks all Vitamin D generation.
Why do people tend to get sick in the wintertime and not the summer?
Why do people tend to get sick in the wintertime and not the summer?
https://pubmed.ncbi.nlm.nih.gov/16959053/