1. Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Orient Point, New York, USA
2. Department of Diagnostic Medicine/Pathobiology, 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. Animal Health Program, National Agricultural Research Center, Islamabad, Pakistan
5. National Veterinary Services Laboratories, Foreign Animal Disease Diagnostic Laboratory, Plum Island Animal Disease Center, Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Orient Point, New York, USA