1. U.S. Department of Agriculture, Agricultural Research Service; Animal and Natural Resources Institute, Animal Parasitic Diseases Laboratory; Building 1044, BARC-East Beltsville MD 20705-2350
2. U.S. Department of Agriculture, Agricultural Research Service; Animal and Natural Resources Institute, Animal Parasitic Diseases Laboratory; Building 1001, BARC-East Beltsville MD 20705-2350