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Cumulative incidence of primary Epstein-Barr virus infection in infants. A, Primary postnatal infections occurring in the first 18 months of life in the infant cohort. B, Stratified data showing infants born to human immunodeficiency virus type 1 (HIV-1)–uninfected women (lower curve) and HIV-1–infected women (upper curve). Kaplan-Meier methodology used to estimate cumulative incidence of infection and log-rank test used to compare curves.
