1. Infectious Disease Unit, Department of Paediatrics, Federal Medical Centre, Keffi, Nasarawa State, Nigeria
2. Infectious Disease Unit, Department of Paediatrics, Jos University Teaching Hospital, Plateau State, Nigeria
3. Department of Medical Microbiology, Jos University Teaching Hospital, Plateau State, Nigeria
4. Department of Family Medicine, Jos University Teaching Hospital, Plateau State, Nigeria
5. Department of Community Medicine, Jos University Teaching Hospital, Plateau State, Nigeria