1. Division of Infectious Diseases and Travel Medicine, Mount Auburn Hospital, Cambridge, MA 02138, USA
2. Faculty of Medicine, Harvard Medical School, Boston, MA 02115, USA
3. Faculty of Health Sciences, Institute for Clinical Medicine, University of Aarhus, Aarhus 8200, Denmark
4. Emerging Infections Task Force, European Society for Clinical Microbiology and Infectious Diseases, Basel 4001, Switzerland
5. Division of Public Health Surveillance and Response, National Institute for Communicable Diseases, Division of the National Health Laboratory Service, Johannesburg 2131, South Africa
6. Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
7. WHO Collaborating Center for Travellers’ Health, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich 8001, Switzerland
8. Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, University of Texas, Houston, TX 77030, USA