1. Division of Infection and Immunity, NIHR Global Health Research Unit on Mucosal Pathogens, University College London, London, United Kingdom;
2. WHO Collaborating Centre for New Vaccines Surveillance, Medical Research Council Unit The Gambia at London School of Hygiene and Tropical Medicine, Banjul, The Gambia;
3. Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia, Charlottesville, Virginia;
4. World Health Organization (WHO), Regional Office for Africa, Brazzaville, Congo;
5. Department of Paediatrics, Sylvanus Olympio Teaching Hospital, Lomé, Togo;
6. University of Ghana School of Medicine and Dentistry, Accra, Ghana;
7. Komfo Anokye Teaching Hospital, Kumasi, Ghana;
8. Department of Paediatrics, University of Nigeria Teaching Hospital Ituku-Ozalla, Enug, Nigeria;
9. Institute of Child Health, University of Nigeria Teaching Hospital, Enug, Nigeria;
10. Department of Paediatrics, Abubakar Tafawa Balewa University Teaching Hospital, Bauchi, Nigeria;
11. Laboratoire, Hopital National de Niamey, Niamey, Niger;
12. Centre Hospitalier National d’Enfants Albert Royer, Dakar, Senegal;
13. World Health Organization, Geneva, Switzerland;
14. Division of Microbiology and Immunity, Warwick Medical School, University of Warwick, Coventry, United Kingdom;
15. Department of Infection Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom