Background: COVID-19 is a major pandemic that has killed more than 196,000 people. The COVID-19 disease course is strikingly divergent. Approximately 80-85% of patients experience mild or no symptoms, while the remainder develop severe disease. The mechanisms underlying these divergent outcomes are unclear. Emerging health disparities data regarding African American and… Vitamin D Insufficiency is Prevalent in Severe COVID-19 | medRxiv #coronavirus #research #vitamin_D https://www.medrxiv.org/content/10.1101/2020.04.24.20075838v1