In this retrospective cohort study the safety of RefortrixTM (Tdap) administered during pregnancy as part of the National immunization program in Brazil will be assessed by comparing the risk of pre-defined adverse events before and after introduction of the RefortrixTM (Tdap) maternal immunization program.
The purpose of this study is to assess the safety of RefortrixTM (Tdap) when administered during pregnancy in a maternal immunization program in Brazil.