1. Biological Sciences, Warwick University, Coventry, United Kingdom
2. Division of Bacterial Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Health Protection Agency, London, United Kingdom
4. the National Consiliary Laboratory for Diphtheria (NCLD), Oberschleissheim, Germany
5. the National Institute of Public Health (NIPH), Warsaw, Poland
6. National Microbiology Laboratory, PHAC, Winnipeg, Canada
7. Institut Pasteur, Molecular Prevention and Therapy of Human Diseases Unit. Paris, France