1. Animal Parasitic Diseases Laboratory, BARC ARS USDA, Beltsville, Maryland 20705;
2. College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506-5600;, ,
3. University of Veterinary Medicine, Vienna 1210, Austria;
4. College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China;
5. FAHRP-OARDC, The Ohio State University, Wooster, Ohio 44691;