1. Wellcome Trust-Mahosot Hospital-Oxford Tropical Medicine Research Collaboration, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People's Democratic Republic
2. Centre for Clinical Vaccinology and Tropical Medicine, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, United Kingdom
3. Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok 10400, Thailand
4. WHO/FAO/OIE Collaborating Centre for Reference and Research on Leptospirosis, Coopers Plains, Queensland, 4108, Australia
5. WHO/FAO/OIE Collaborating Centre for Reference and Research on Leptospirosis, KIT Biomedical Research, Meibergdreef 39, 1105 AZ Amsterdam, The Netherlands