Patterns of COVID-19 Mortality and Vitamin D: An Indonesian Study. By Glenn Reynolds.
A Facebook friend’s succinct summary of the findings in this study:
Just under half (49.7%) of cases had normal vitamin D status, and only 4% of them died. Just over a quarter (27%) had insufficient vitamin D status, and most of them (88%) died. Just under a quarter (23%) had deficient vitamin D status, and almost all of them (99%) died.
This is one thing you can do — get more sun. It also helps explain why countries in summer and countries near the equator are not being hit as hard by the virus.