1. Vector-borne Disease Control Program, Department of Public Health , Ministry of Health, Gelephu, PO Box 31101 , Bhutan
2. Central Regional Referral Hospital, Department of Medical Services, Ministry of Health , Gelephu, PO Box 31101 , Bhutan
3. Global and Tropical Health Division, Menzies School of Health Research and Charles Darwin University , Darwin, NT, PO Box 795 , Australia
4. Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University , Bangkok 73170 , Thailand
5. Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford , Oxford OX12JD , UK
6. Department of Global Health, National Centre for Epidemiology and Population Health, College of Health and Medicine, Australian National University , Acton, ACT 2601 , Australia