An analysis of over 190,000 US SARS-CoV-2 test results shows positivity rate halved with vitamin D levels of 55 ng/ml or higher vs. less than 20 ng/ml  Grassroots

Note: Actual results were likely much better, because the PCR tests had an extremely high rate of false positives in 2020, due to the high cycle rate:

NY TIMES, 8/29/20: Up to 90% Who’ve Tested COVID-Positive Wrongly Diagnosed!

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SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels

Harvey W. Kaufman, Justin K. Niles, Martin H. Kroll, Caixia Bi, Michael F. Holick

Published: September 17, 2020

STUDY