1. Tifton Veterinary Diagnostic and Investigational LaboratoryUniversity of Georgia College of Veterinary MedicineTiftonGeorgiaUSA
2. Athens Veterinary Diagnostic LaboratoryDepartment of PathologyUniversity of Georgia College of Veterinary MedicineAthensGeorgiaUSA
3. Veterinary Diagnostic LaboratoryUniversity of Minnesota College of Veterinary MedicineSaint PaulMinnesotaUSA
4. Department of Comparative PathobiologyPurdue University College of Veterinary MedicineWest LafayetteIndianaUSA
5. Department of VirologyFaculty of Veterinary MedicineUniversity of Sadat CitySadat CityEgypt