1. Department of Biomedical Sciences, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
2. Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana
3. U. S. Naval Medical Research Unit No. 3 (NAMRU-3), Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana
4. Department of Protozoology Institute of Tropical Medicine (NEKKEN), Nagasaki University Sakamoto 1-12-4, Nagasaki 852-8523, Japan