1. Foreign Animal Disease Research Unit Plum Island Animal Disease Center Agricultural Research Service United States Department of Agriculture Greenport NY USA
2. Oak Ridge Institute for Science and Education PIADC Research Participation Program Oak Ridge TN USA
3. Department of Pathobiology and Population Medicine College of Veterinary Medicine Mississippi State University Mississippi State MS USA
4. Regional Animal Health Office No. 6 Department of Animal Health Ministry of Agriculture and Rural Development Ho Chi Minh City Vietnam
5. National Centre for Veterinary Diagnostics Hanoi Vietnam
6. Department of Animal Health Ministry of Agriculture and Rural Development Hanoi Vietnam