1. Animal Parasitic Diseases Laboratory; United States Department of Agriculture; Beltsville Agricultural Research Center; Agricultural Research Service; Beltsville Maryland 20705-2350
2. Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California; Davis California 95616
3. Department of Pathology; University of California, San Diego; La Jolla California 92093
4. Canada West Veterinary Specialists; 1988 Kootenay Street Vancouver British Columbia V6R 1E5 Canada
5. Joint Pathology Center; Veterinary Pathology Services, US Army; 606 Stephen Sitter Ave Silver Spring Maryland 20910
6. Molecular Parasitology Section; Laboratory of Parasitic Diseases; National Institute of Allergy and Infectious Diseases; National Institutes of Health; Bethesda Maryland 20892