1. From the Departments of Epidemiology, Infectious Diseases, and Microbiology, University of Pittsburgh School of Medicine, Pittsburgh (J.B.N.); the Departments of Epidemiology and International Health, Johns Hopkins Bloomberg School of Public Health (J.B.N.), and the Department of Gynecology and Obstetrics, Johns Hopkins School of Medicine (J.R.A.) — both in Baltimore; the Department of Medicine, Division of Infectious Diseases, Stellenbosch University Faculty of Medicine and Health Sciences (J.B.N.)...