What is Known:
• The prediction of prepartum GBS screening for intrapartum colonization status has not been well studied.
• Longitudinal studies of GBS screening are needed for screening program evaluations and vaccine development.
What is New:
• The rate of GBS screening has improved over 10 years, and intrapartum GBS colonization prediction was accurate.
• Serotype distribution was stable and suggests the potential long-term efficacy of GBS vaccines.