1. Department of Medicine, Division of Infectious Diseases, Molecular Microbiology and Microbial Pathogenesis Program, Washington University School of Medicine,
St. Louis, MO, USA
2. Molecular Microbiology and Microbial Pathogenesis Program, Division of Biology and Biomedical Sciences, Washington University School of Medicine,
St. Louis, MO, USA
3. Medicine Service, Veterans Affairs Medical Center,
St. Louis, MO, USA
4. Centre for Vaccine Sciences, International Centre for Diarrhoeal Disease Research,
Mohakhali Dhaka-1212, Bangladesh