1. Kenya Medical Research Institute, Center for Global Health Research , Kisumu , Kenya
2. Center for Vaccine Development and Global Health, University of Maryland School of Medicine , Baltimore, Maryland , USA
3. Department of Pediatrics, University of Maryland School of Medicine , Baltimore, Maryland , USA
4. Division of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
5. Centre pour le Développement des Vaccins du Mali , Bamako , Mali
6. Medical Research Council Unit, The Gambia at the London School of Hygiene & Tropical Medicine , Banjul , The Gambia
7. Department of Medicine, University of Maryland School of Medicine , Baltimore, Maryland , USA
8. Department of Epidemiology and Public Health, University of Maryland School of Medicine , Baltimore, Maryland , USA
9. Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia , Charlottesville, Virginia , USA
10. Department of Microbial Surveillance and Biosafety, School of Public Health, Qingdao University , Qingdao , China
11. Division of Global Health Protection, Centers for Disease Control and Prevention , Nairobi , Kenya