[1] ALBERTA DEPT AGR, DIV ANIM HLTH, PATHOL BRANCH, POB 8070, EDMONTON T6H 4P2, ALBERTA, CANADA
[2] ALBERTA DEPT AGR, DIV ANIM HLTH, LETHBRIDGE, ALBERTA, CANADA
[3] UNIV SASKATCHEWAN, WESTERN COLL VET MED, DEPT PATHOL, SASKATOON S7N 0W0, SASKATCHEWAN, CANADA
[4] UNIV ALBERTA, DEPT PATHOL, EDMONTON T6G 2E1, ALBERTA, CANADA
[5] UNIV CALGARY, DEPT MED BIOCHEM, CALGARY T2N 1N4, ALBERTA, CANADA