1. Departmento de Parasitología, Facultad de Microbiología, Universidad de Costa Rica, Costa Rica
2. Hospital Leonardo Martínez, San Pedro Sula, Honduras
3. Department of Tropical Medicine, School of Public Health and Tropical Medicine, Tulane University, New Orleans, Louisiana 70112
4. and
Centro de Investigacíon y Desarrollo, Tegucigalpa, Honduras‖