1. Infectious and Tropical Diseases Unit, Department of Medicine, Aminu Kano Teaching Hospital, Kano, Nigeria
2. Infectious and Tropical Diseases Unit, Department of Medicine, College of Health Sciences, Bayero University Kano, Nigeria
3. Department of Medical Microbiology and Parasitology, Aminu Kano Teaching Hospital, Nigeria
4. Department of Medicine, College of Health Sciences, Bayero University Kano, Nigeria