Confirmed cases of coronavirus disease 2019 (COVID-19) and case-fatality rates vary among countries. One reason could be national policies regarding childhood BCG vaccination, with fewer confirmed cases and a lower death toll reported in countries with vs without universal BCG vaccine coverage.1,2 Comparing outbreak characteristics between countries is influenced by potential confounders such as different phases of outbreak, mean age of affected population, management of the pandemic, amount of tests being administered, definitions of COVID-19–related deaths, or underreporting.
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CME Disclosure Statement: Unless noted, all individuals in control of content reported no relevant financial relationships. If applicable, all relevant financial relationships have been mitigated.
Corresponding Author: Ilan Youngster, MD, MMSc, Pediatric Infectious Diseases Unit, Center for Microbiome Research, Shamir Medical Center, Zerifin 70300, Israel (firstname.lastname@example.org).
Accepted for Publication: April 30, 2020.
Published Online: May 13, 2020. doi:10.1001/jama.2020.8189
Author Contributions: Dr Youngster had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Concept and design: Hamiel, Youngster.
Acquisition, analysis, or interpretation of data: Kozer, Youngster.
Drafting of the manuscript: Hamiel, Youngster.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Youngster.
Conflict of Interest Disclosures: None reported.
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