1. Departments of Molecular Microbiology and Genetics, Washington University Medical School, St. Louis, Missouri 631101;
2. Department of Pathology, Universidad Peruana Cayetano Heredia, Lima, Peru2;
3. Instituto de Nutricion de Centroamerica y Panama, Guatemala City, Guatemala 090013;
4. Division of Gastroenterology, Chris Hani Baragawanath Hospital, Johannesburg 2013, South Africa4;
5. Cancer Institute, China Medical University, Shenyang,5 and
6. Department of Microbiology, Hospital Universitario de la Princesa, Madrid, Spain6;
7. National Institute of Cholera and Enteric Diseases, Calcutta-700010, India7;
8. Department of Microbiology, Yamaguchi University School of Medicine, Ube, Yamaguchi 755, Japan8;
9. Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong,9 China;
10. Department of Odontology, Umea University, SE-901 85 Umea,10 and
11. Swedish Institute for Infectious Disease Control, SE-171 82 Solna,11Sweden;
12. Sir James Spence Institute of Child Health, The Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom12; and
13. Division of Gastroenterology, Childrens Hospital, Case Western Reserve Medical School, Cleveland, Ohio 4410613