Original (non-paywalled) link that you gave would be better than the Telegraph article; thanks for that. I have read elsewhere that Spain has a high rate of vi

Original (non-paywalled) link that you gave would be better than the Telegraph article; thanks for that. I have read elsewhere that Spain has a high rate of vitamin-D deficiency (https://www.researchgate.net/publication/49703062_Vitamin_D_deficiency_in_Spain_A_population-based_cohort_study https://www.researchgate.net/publication/49703062_Vitamin_D_...), especially among the elderly. What works in Spain may not work elsewhere, depending on vitamin D levels. But it seems pretty easy to at least make a check for vitamin D deficiency part of the standard treatment for covid-19.