NewYork-Presbyterian Hospital, NewYork-Presbyterian Hospital, Mayo Clinic College of Medicine and Science, Cornell University - Weill Cornell Medicine, Gates Foundation, Kenya Medical Research Institute (KEMRI), Population Council, Kenya, Homa Bay Teaching and Referral Hospital, Johns Hopkins University - JHPIEGO-Tanzania, Johns Hopkins University - JHPIEGO-Tanzania, Johns Hopkins University - JHPIEGO-Tanzania, Johns Hopkins University - JHPIEGO-Tanzania, University of Dar es Salaam, University of Dar es Salaam, Johns Hopkins University - Department of Medicine, Government of Uganda - Uganda Virus Research Institute (UVRI), Government of Uganda - Uganda Virus Research Institute (UVRI), Rakai Health Science Program, Government of Uganda - Uganda Virus Research Institute (UVRI), Government of Uganda - Uganda Virus Research Institute (UVRI), Government of Uganda - Uganda Virus Research Institute (UVRI), Cornell University - Weill Cornell Medicine, Cornell University - Weill Cornell Medicine and NewYork-Presbyterian Hospital