1. From the Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA (J.R.A.); the Department of Pediatric and Child Health, the Aga Khan University, Karachi, Pakistan (F.N.Q.); and the Division of Infectious Diseases, Massachusetts General Hospital (R.C.C., E.T.R.), the Department of Medicine, Harvard Medical School (R.C.C., E.T.R.), and the Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health (E.T.R.) — all in Boston.