There was some discussion about this on another thread: https://news.ycombinator.com/item?id=23079976 https://news.ycombinator.com/item?id=23079976 Essentially

There was some discussion about this on another thread: https://news.ycombinator.com/item?id=23079976 https://news.ycombinator.com/item?id=23079976 Essentially, one of the theories is that severely low Vitamin D can cause a hypercoagulable state and also increase the risk of the “cytokine storm” often observed in Covid-19 patients.