1 From the Yale School of Public Health, New Haven, CT (A.I.K.); the Instituto Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador (A.I.K.), and the Center for Technological Development in Health, Fundação Oswaldo Cruz, Rio de Janeiro (C.M.) - both in Brazil; the Centre for the AIDS Programme of Research in South Africa, University of KwaZulu-Natal, Durban (S.S.A.K.); the Department of Epidemiology, Columbia University (S.S.A.K.), and EcoHealth Alliance (P.D.) - both in New York; the MS Swaminathan Research Foundation, Chennai, India (S.S.); and the Chobanian and Avedisian School of Medicine, Boston University, Boston (G.T.K.).