Hibbs, R. G.; Corwin, A. L.; Hassan, N. F.; Kamel, M.; Darwish, M.; Edelman, R.; Constantine, N. T.; Rao, M. R.; Khalifa, A. S.; Mokhtar, S.; Fam, N. S.; Ekladious, E. M.; Bassily, S. B.; US Naval Medical Research Unit No. 3. Cairo University Faculty of Medicine, Ain Shams University Faculty of Medicine (Microbiology and Pediatrics Departments), Theodor Bilharz Research Institute, Cairo, Egypt; Center for Vaccine Development and Department of Pathology, University of Maryland, Baltimore; Epidemiology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland