Anna R. SpicklerInstitute for International Cooperation in Animal Biologics/OIE Collaborating Center for Diagnosis of Animal Diseases and Vaccine Evaluation in the Americas, College of Veterinary Medicine, Iowa State University, Ames, IA 50011.
Bernt E. JonesDivision of Diagnostic Imaging and Clinical Chemistry, Department of Biomedical Sciences and Veterinary Public Health, Faculty of Veterinary Medicine and Animal Sciences, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden.