I've been pondering this one too. If there's just correlation, then it makes sense. Odds are older people - especially those in nursing homes - don't get much

I've been pondering this one too. If there's just correlation, then it makes sense. Odds are older people - especially those in nursing homes - don't get much sunshine and therefore would have lower vitamin D. Alternatively, if there is causation where lower vitamin D levels make you higher risk of infection or a more severe infection, then forcing everyone inside (aka reduced sunshine) via lockdowns is the exactly wrong policy. And if sunshine kills the virus in the first place, then the lockdowns are worse on another front. We should encourage people to hang out in the sun before going inside anywhere. It would be a form of decontamination. Regardless, this is further encouragement to stay away from the NYC subway system!