1. Adult Infectious Diseases Ward, Mahosot Hospital, Vientiane, Laos;
2. Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos;
3. Institute of Research and Education Development (IRED), University of Health Sciences, Vientiane, Laos;
4. Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom;
5. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom