I suppose this is confirmed with a 186 patients study on Belgium https://www.brusselstimes.com/belgium/139966/belgian-researchers-find-link-between-lack-of-vit

I suppose this is confirmed with a 186 patients study on Belgium https://www.brusselstimes.com/belgium/139966/belgian-researchers-find-link-between-lack-of-vitamin-d-serious-covid-19-az-delta-roeselare-hospital-study-coronavirus-covid19-patients-increased-risk-severe-case-death-mortality-vitamin-d-deficiency/ https://www.brusselstimes.com/belgium/139966/belgian-researc...