1. 1Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland;
2. 2Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland;
3. 3Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland;
4. 4Samoa Typhoid Fever Control Program, Ministry of Health, Government of Samoa, Apia, Samoa;
5. 5Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland;
6. 6Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland;
7. 7Tupua Tamasese Meaole Hospital, Ministry of Health, Government of Samoa, Apia, Samoa;
8. 8Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia;
9. 9Murdoch Children’s Research Institute, Royal Children’s Hospital, Melbourne, Australia