1 a Departments of Paediatrics (GOA), Public Health (DAA), Obstertrics and Gynaecology (SAO) and Internal Medicine (POO), Faculty of Clinical Sciences, College of Medicine , Ambrose Alli University , Ekpoma , Nigeria.
2 b Departments of Paediatrics (GOA), Public Health (DAA), Obstertrics and Gynaecology (SAO), Internal Medicine (POO), and Institute of Lassa Fever Research and Control (GOA, DAA, SAO, POO) , Irrua Specialist Teaching Hospital , Irrua , Nigeria.