As I mentioned before, when Asian immigrants started to arrive in the 70s, their children were getting rickets. It's thought their dark skin was naturally blocking out the sun/vitD. It's what I was trying to explain, perhaps this could be the cause of why BAME are falling to this virus more than others. Vit D supports the immune system. In the 70s Asian immigrants were advised to make more use of eggs (good source of Vit D) in their diet.
In the UK from Victorian times, poor children were given a spoonful of codliver oil before bed ?