1. Oxford University Clinical Research Unit , Ho Chi Minh City, Vietnam
2. Faculty of Animal Science and Veterinary Medicine, Nong Lam University , Ho Chi Minh City, Vietnam
3. Sub-Department of Animal Health and Production , Dong Thap Province, Vietnam
4. Centre for Tropical Medicine and Global Health, University of Oxford , Oxford, UK
5. Cambridge Institute of Therapeutic Immunology & Infectious Disease, University of Cambridge , Cambridge, UK