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