Ethical considerations
Study procedures were approved by the Washington University in St. Louis Institutional Review Board (#201811106), Columbia University Institutional Review Board (IRB-AAAR9804) and the in-country local Institutional Review Boards in Uganda: Uganda Virus Research Institute (UVRI–GC/127/18/10/690), and the Uganda National Council of Science and Technology (UNCST–SS4828). Written consent was obtained from all WESW in the study. The study is also overseen by an in-country Data Safety and Monitoring Board, as detailed in the study protocol [