1. Department of Community Medicine, Alex Ekwueme Federal University Teaching Hospital Abakaliki, Abakaliki, Nigeria
2. Department of Paediatric, Alex Ekwueme Federal University Teaching Hospital Abakaliki, Abakaliki, Nigeria
3. Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Science, University of Antwerp, Antwerp, Belgium
4. Department of Microbiology, Lagos University Teaching Hospital, Surulere, Nigeria
5. Department of Community Medicine, Ebonyi State University, Abakaliki, Nigeria