Data Items
The initial data extraction tool contained the items as follows: study title, study purpose, whether GBS was reported, level of analysis - genus/species (in the case of GBS not reported), sequencing methods, 16S rRNA primer region (for studies using 16S rRNA sequencing), sequencing platform, taxonomy classification database, DNA collection kit, DNA extraction kit, number of pregnant women, number of vaginal specimens, age of pregnant women, pregnancy period in which the specimen collected, ethnicity/region of the participants/study design. In studies that reported taxonomy to the species level and GBS was not detected, we also assessed the articles to determine if Streptococcus at the genus level was reported.