1. Department of Microbiology, Ahmadu Bello University, Zaria, Nigeria.
2. HIV Pathogenesis Programme, Doris Duke Medical Research Institute, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.
3. Department of Biochemistry, Ahmadu Bello University, Zaria, Nigeria.
4. Department of Gyneacology and Obstetrics, Ahmadu Bello University Teaching Hospital, Ahmadu Bello University, Zaria, Nigeria.