1. Phytomedicine Programme, Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, Pretoria 0110, South Africa
2. Department of Microbiology/Immunology, Faculty of Basic Medical Science, Kampala International University, Kampala, Uganda
3. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon