Table 1.

Search strategies.

Sources of Information	Search String
PUBMED	Search: (COVID-19) OR (SARS- CoV-2) AND (pregnancy) AND (fetal transmission) AND (complications) AND (outcomes). Filters: Full text, publication date 5 years.
SCOPUS	Search within (article title, abstract, keywords): (COVID-19) OR (SARS-CoV-2) AND (pregnancy) AND (fetal transmission) AND (complications) AND (outcomes) AND (Limit-to (DOCTYPE “ar”)).
COCHRANE LIBRARY	Search: (COVID-19) OR (SARS- CoV-2) AND (pregnant) AND (outcomes) in title, abstract, keyword.
CINAHL	Search: (COVID-19) OR (SARS- CoV-2) AND (pregnant) AND (rct) AND (outcomes) AND (vertical mother-to-child transmission).