Don I read that they (Medics), are trying to get donated blood from folks that recovered from corona virus.. apparently if your body fights off the virus your immune system will prevent you from ever getting it again. Techs say they can create a vaccine from this donated blood.
As I wrote in the Bar, this is a passive vaccination, actually it was already used during the Spanish flu in 1918 in a basic form.
The side effect of this method can be that the immune system overreacts, which would worsen the condition, but there is quite a chance it will help some of the worst cases...