Relationship of maternal respiratory syncytial virus (RSV) plaque-reduction neutralizing titer (PRNT) to cord RSV PRNT in the presence and absence of placental malaria (PM). PRNTs are expressed as reciprocal log2. In each graph, the solid line represents a cord-to-maternal titer ratio of 1.0. A, Alexishafen cohort, all pairs. B, Alexishafen cohort, PM-positive pairs. C, Alexishafen cohort, PM-negative pairs. D, FIS cohort, all pairs. E, FIS cohort, PM-positive pairs. F, FIS cohort, PM-negative pairs. Abbreviation: FIS, Fetal Immunity Study.