Background The observations of some recent epidemiological studies offer hope for a reduced impact of COVID-19 for countries which practice universal BCG vaccination policy. Main body This report provides a correlation between the case fatality rates of COVID-19 and the percentage of BCG vaccination coverage in 183 most affected countries. The main objective of this observational ecologic report is to evaluate possible effects of the previous BCG vaccination in different populations and the epidemic outcomes specially the rates of severe/critical cases and case fatalities. The analysis is preliminary since it is based on constantly rolling data while the COVID-19 pandemic is still unfolding. Conclusion Our findings seem to support the fact that an older BCG vaccine may have a protective role in avoiding severe/critical SARS-CoV2 pneumonia and relatively decrease its fatalities.
【저자키워드】 COVID-19, coronavirus disease, SARS-CoV-2, BCG vaccination, tuberculosis vaccine, 【초록키워드】 Vaccine, SARS-CoV2, Pneumonia, COVID-19 pandemic, outcome, Population, Coverage, BCG, Case fatality rate, correlation, Analysis, Support, observation, Older, protective role, Epidemiological study, offer, Effect, country, decrease, the epidemic, affected, evaluate, reduced, provide, 【제목키워드】 BCG, COVID-19 case, Fatality rate, the vaccine,