1. Department of Veterinary Clinical Sciences; College of Veterinary Medicine; Washington State University; Pullman WA USA
2. National Animal Disease Center; USDA-Agricultural Research Service; Ames IA USA
3. School of Mechanical and Materials Engineering; Washington State University; Pullman WA USA
4. Department of Veterinary Microbiology and Pathology; Washington State University; Pullman WA USA
5. Department of Microbiology; Faculty of Veterinary Medicine; Alexandria University; Alexandria Egypt