First whether it is manufactured or just has evolved into its current version, Corona’s closest natural relative has been shown to reside/have evolved in bats. Bats, we know, are mammals who live in a low vitamin D environment. Therefore, it should come as no surprise that persons with the lowest D levels should be at greater risk.
Vitamin D Deficiency: 42% of the U.S. population is Vitamin D deficient. Compare this to 99% of the African-American population with deficiency or insufficiency and we have a basis for a disproportional epidemiological impact.
The desired goal is a Vitamin D level of 50 nanograms per milliliter.
The low Vitamin D affect on the immune system is exacerbated by nutritional deficiencies, brought on by disease states such as diabetes, hypertension, and obesity. These chronic diseases encourage further diminution of critical supporting elements of the immune system. It should be no surprise that the populations that bear these disease burdens would be at greatest risk for morbidity and mortality from CoVID-19.