biostudies-literatureUnknown5(4)Ford R<h4>Background</h4>Maternal vaccination is a recognized strategy for reducing maternal and neonatal morbidity and mortality, including in low- and middle-income countries (LMICs). As new vaccines such as those for respiratory syncytial virus (RSV) and group B streptococcus (GBS) will be administered according to gestational age (GA), understanding real-world patterns of contact of pregnant women with antenatal care services (ANC) across pregnancy is essential to inform the most effective delivery strategies.<h4>Methods</h4>We conducted a retrospective longitudinal, multisite analysis using anonymized data extracted from maternal health registers at ANC and delivery clinics in 6 LMICs: Bangladesh, The Gambia, Nepal, Nigeria, Tanzania, and Uganda. Eligible clinics contributed data from ANC aAJOG global reports100579https://www.ebi.ac.uk/biostudies/studies/S-EPMC12670892biostudies-literatureQuantifying maternal vaccination opportunities across gestational age windows: a real-world multi-country, longitudinal study.PMC12670892Thami RHossain MMParker EPKKajungu DNambasa VBhattarai SKampmann BFord RMadubueze UNkereuwem OMsoka AAgbo UfalseQuantifying maternal vaccination opportunities across gestational age windows: a real-world multi-country, longitudinal study.<h4>Background</h4>Maternal vaccination is a recognized strategy for reducing maternal and neonatal morbidity and mortality, including in low- and middle-income countries (LMICs). As new vaccines such as those for respiratory syncytial virus (RSV) and group B streptococcus (GBS) will be administered according to gestational age (GA), understanding real-world patterns of contact of pregnant women with antenatal care services (ANC) across pregnancy is essential to inform the most effective delivery strategies.<h4>Methods</h4>We conducted a retrospective longitudinal, multisite analysis using anonymized data extracted from maternal health registers at ANC and delivery clinics in 6 LMICs: Bangladesh, The Gambia, Nepal, Nigeria, Tanzania, and Uganda. Eligible clinics contributed data from ANC a2025-01-01T00:00:00Z2025 Nov2026-06-08T04:50:50.919Z2026-06-08T03:08:22.766ZS-EPMC126708924134128310.1016/j.xagr.2025.100579