"Vitamin D deficiency was found in 82.2% of COVID-19 cases and 47.2% of population-based controls (p<0.0001). [...] 25OHD levels are lower in hospitalized COVID-19 patients than in population-based controls and these patients had a higher prevalence of deficiency."

Surprise, surprise!

And frankly speaking, I doubt that anybody gets ill with 25(OH)D levels above 50 ng/mL.

https://academic.oup.com/jcem/article/106/3/e1343/5934827

@Goddek