1. Department of Microbiology and Immunology, and Göteborg Vaccine Research Institute (GUVAX), Göteborg University, Göteborg, Sweden
2. Laboratory Sciences Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
3. Laboratorios de Microbiologia INCAP, Ciudad de Guatemala, Guatemala
4. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
5. Enteric Diseases Department, Naval Medical Research Center, Silver Spring, Maryland