1. Regional Animal Health Office Number 2, Department of Animal Health, Haiphong 180000, Vietnam.
2. Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand.
3. Bureau of Disease Control and Veterinary Service, Department of Livestock Development, Bangkok 10400, Thailand.
4. Epidemiology Division, Department of Animal Health, Hanoi 100000, Vietnam.
5. Emergency Center for Transboundary Animal Diseases, FAO Country Office for Vietnam, Hanoi 100000, Vietnam.