1. Liverpool School of Tropical Medicine, Pembroke Square, Liverpool, United Kigdom;
2. Neglected Tropical Diseases Support Center, Task Force for Global Health, Decatur, Illinois;
3. Yemeni Onchocerciasis Program, Tiaz, Yemen;
4. Parasitology Laboratory, National Institutes of Health/National Institute of Allergy and Infectious Diseases, Bethesda, Maryland;
5. Perry Street, Kent, United Kingdom
6. Department of Pathobiology and Diagnostic Investigation, Michigan State University, East Lansing, Michigan;