1. Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, Massachusetts, USA
2. Department of Microbiology, Harvard Medical School, Boston, Massachusetts, USA
3. Howard Hughes Medical Institute, Bethesda, Maryland, USA
4. Enteric Disease and Vaccine Research Unit, Centre for Infectious Disease Research in Zambia, Lusaka, Zambia
5. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA