1. National Defence Research Establishment, Umeå, Sweden
2. Defence Evaluation and Research Agency, CBD Porton Down, Salisbury, Wilts, United Kingdom
3. Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
4. Department of Bacterial Diseases, Walter Reed Army Institute of Research, Washington, D.C.
5. Department of Biochemistry, Imperial College of Science Technology and Medicine, London, United Kingdom
6. Department of Medical Microbiology, St. Bartholomews and the Royal London School of Medicine and Dentistry, London, United Kingdom
7. Department of Microbiology and Immunobiology, The Queen's University Belfast, Belfast, Ireland
8. National Defence Research Establishment, Umeå, Sweden and Department of Clinical Microbiology, Infectious Diseases, Umeå University, Umeå, Sweden
9. National Defence Research Establishment, Umeå, Sweden and Department of Clinical Microbiology, Clinical Bacteriology, Umeå University, Umeå, Sweden
10. Department of Molecular Evolution, University of Uppsala, Uppsala, Sweden