aInternational Research Center of Excellence, Institute of Human Virology Nigeria, Abuja, Nigeria

bDivision of Epidemiology and Prevention, Institute of Human Virology

cDepartment of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland, USA

dDepartment of Paediatrics and Child Health, University of Cape Coast School of Medical Sciences, Cape Coast

ePaediatric Infectious Diseases Unit, Directorate of Child Health, Komfo Anokye Teaching Hospital, Kumasi, Ghana

fRespiratory/Infectious Diseases Unit, Department of Paediatrics, University of Calabar and University of Calabar Teaching Hospital, Calabar, Nigeria

Correspondence to Nadia A. Sam-Agudu, International Research Center of Excellence, Institute of Human Virology Nigeria, Plot 62 Emeritus Umaru Shehu Way, Cadastral Zone C00, Abuja, Nigeria. Tel: +234 (0) 9 461 0342; e-mail: [email protected]