1. Departments of Veterinary Medicine and Surgery, MO 65211 and Pfizer Inc., Kalamazoo, MI 49001.
2. Pathobiology, University of Missouri, Columbia, MO 65211 and Pfizer Inc., Kalamazoo, MI 49001.
3. Veterinary Diagnostic Laboratory, University of Missouri, Columbia, MO 65211 and Pfizer Inc., Kalamazoo, MI 49001.
4. College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 and Pfizer Inc., Kalamazoo, MI 49001.