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> The overall prevalence rate of vitamin D deficiency was 41.6%, with the highest rate seen in blacks (82.1%), followed by Hispanics (69.2%).

So doesn't explain the whole observed effect

Edit: also the study was in Spain, not USA

Interesting point. I wonder if this is part of the disproportionately high impact of COVID on Black in the US.

*Black people. Didn't spot my typo until after the edit event horizon, but it seemed like an important correction to make.