Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA. Department of Pediatrics. Laboratory Medicine and Pathology; and. Global Health and Medicine, University of Washington, Seattle, WA. Center for Biostatistics in AIDS Research, Harvard T. H. Chan School of Public Health, Boston, MA. Infectious Diseases Department, Hospital Federal dos Servidores do Estado, Rio de Janeiro, Brazil. Evandro Chagas National Institute of Infectious Diseases, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil. Department of Pediatrics, Boston University School of Medicine, Boston, MA. Westat, Rockville, MD. Frontier Science, Amherst, NY; and. Maternal and Pediatric Infectious Diseases Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD.