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Distribution of cases of invasive pneumococcal disease for children <5 years, by month of age for children in a developing country (South Africa) and in an industrialized country (United States) [Data are unpublished and from the Group for Enteric, Respiratory and Meningeal Disease Surveillance in South Africa (GERM-SA), courtesy of Anne Von Gottberg and the US Active Bacterial Core surveillance/Emerging Infections Program Network, courtesy of Matthew Moore.].
