Does vitamin D deficiency increase COVID-19 risk?

Does vitamin D deficiency increase COVID-19 risk?

A new paper published on the preprint server medRxiv* in May 2020 reports the first evidence that vitamin D deficiency and inadequate treatment could increase the chances of testing positive for COVID-19. This could shape the way for screening individuals at risk for vitamin D deficiency.

Classifying Vitamin D Deficiency
The study by researchers at the University of Chicago looked at over 4,300 patients with COVID-19 of whom 499 had been tested for vitamin D levels in the previous year. Based on this, they were divided into likely deficient (25%), likely adequate (58%), and uncertain (16%).
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