Association between COVID-19 morbidity and mortality rates and BCG vaccination policies in OECD countries.

We compared whether the national BCG vaccination (BCGV) policy influenced coronavirus disease 2019 (COVID-19) in Organisation for Economic Co-operation and Development (OECD) countries. Those currently implementing BCGV have a reduced number of COVID-19 morbidity and mortality cases, compared to those who have never implemented a BCGV policy, suggesting the potential protective effect of BCGV against COVID-19.