1. Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, New York, USA
2. Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
3. Oak Ridge Institute for Science and Education, Plum Island Animal Disease Center Research Participation Program, Oak Ridge, Tennessee, USA
4. Regional Animal Health Office Number 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Hồ Chí Minh City, Vietnam
5. Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam