1. Spatial Epidemiology and Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, USA.
2. Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA.
3. National Institute of Hygiene and Epidemiology, Hanoi, Vietnam.
4. Cao Bang Provincial Center for Disease Control, Cao Bang City, Cao Bang, Vietnam.
5. Cao Bang Provincial Sub-Department of Plantation and Animal Husbandry, Cao Bang City, Cao Bang, Vietnam.
6. School of Preventive medicine and public health, Hanoi Medical University, Hanoi, Vietnam.
7. Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam.