Table 1 Detailed search and selection strategy

Population

Native population of countries with national BCG vaccination policies

Intervention

National Bacille Calmette-Guérin (BCG) policy

Vaccine for tuberculosis (TB) disease

Outcome

Decrease Infection incidence and reduction of severity

Search terms

#1 Universal BCG vaccination

#2 BCG policy

#3 Bacille Calmette-Guérin

#4 policy

#5 COVID 19

#6 SARS COV 2

#7 TB Vaccine policy

Search combinations

((“Universal BCG vaccination”) OR (“BCG Policy”) AND ((“COVID 19”) OR (SARS COV 2”))

((“Bacille Calmette-Guerin”) AND (“Policy”)) AND ((“COVID 19”) OR (SARS COV 2”))

((“BCG Policy”) OR (“TB Vaccine Policy”)) AND ((“COVID 19”) OR (SARS COV 2”))

Databases

PubMed, Cochrane, HERDIN Plus, WPRIM, Web of Science, EBSCO