1. Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
2. Laboratory for Emerging Infectious Diseases, University of Buea, Buea, Southwest Region, Cameroon
3. Department of Microbiology, The University of Yaounde I, Yaounde, Cameroon
4. Faculty of Medicine and Biomedical Sciences, The University of Yaounde I, Yaoundé, Cameroon
5. Center for Research in Health and Priority Pathologies, Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
6. Epidemiological Surveillance, Evaluation and Research Unit, National AIDS Control Committee, Douala, Cameroon
7. Department of Public Health and Hygiene, University of Buea, P.O. Box 63, Buea, Cameroon