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¹ Canadian Cooperative Wildlife Health Centre, Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5B4
² Prairie Diagnostic Services, 52 Campus Drive, Saskatoon, Saskatchewan, Canada, S7N 5B4
³ National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington St., Winnipeg, Manitoba, Canada R3E 3R2
⁴ Corresponding author (email: gary.wobeser{at}usask.ca)

ABSTRACT:   Type B tularemia caused by Francisella tularensis subsp. holarctica was diagnosed in deer mice (Peromyscus maniculatus) found dead at four sites in west-central Saskatchewan during April and May 2005. The occurrence of tularemia coincided with a decline in the number of deer mice in part of a large area (>22000 km² ) in which deer mice had been extremely abundant during the autumn of 2004 and spring of 2005, and in which mice caused damage to crops in the autumn of 2004. This is apparently the first report of tularemia as a cause of death of wild deer mice. The bacterium isolated from deer mice was atypical in that cysteine was not required in the media used for isolation. Three isolates tested were genotypes not previously identified in Canada. There were no reports of human disease in the area.
  Key words:  Crop damage, deer mouse, epizootic, Francisella tularensis, Peromyscus maniculatus, tularemia, zoonosis.