Ethical considerations
NAIROBI
The Uganda National Council for Science and Technology (HS 1850, HS 1584) and Uganda Virus Research Institute-Research Ethics Committee (GC/127/15/07/439, GC/127/14/04/454) approved the Entebbe and Kampala SiVET studies, respectively. The Nairobi SiVET was approved by Kenyatta National Hospital/University of Nairobi Ethics and Research Committee (P137/03/2015). We obtained written informed consent from all participants before any study procedures.