Observational Studies: Countries with Universal BCG Vaccination Policy May Have Reduced Mortality from COVID-19

[Preprint] Differential COVID-19-attributable mortality and BCG vaccine use in countries – medRxiv

[Preprint] Association of BCG vaccination policy with prevalence and mortality of COVID-19 – medRxiv

See also: [Preprint] Observational Study: Countries with Universal BCG Vaccination Policy May Have Reduced Morbidity and Mortality for COVID-19 (study and commentaries)