The dogs in this case were initially diagnosed with B. canis infection on the basis of clinical history, serological testing, and bacterial culture. Novel findings included differences between male and female dogs in regards to both lesion distribution and
tissues most likely to yield bacteria. Further efforts to character- ize the recovered isolates by specialized laboratories yielded con- flicting interpretations (B. canis and B. suis biovar 3). Currently, 6 species of the genus Brucella are recognized (4). That the distinction between B. canis and B. suis is difficult should not be surprising; B. canis was once considered a biotype of B. suis, with considerable genetic and phenotypic overlap between them (5), emphasizing the complexity and necessary experience asso- ciated with speciating some members of such a closely related genus. Currently, Canada is considered free of B. suis biovar 3, the presence of which represents a significant concern to the swine industry, whereas B. canis is considered endemic (6). The origins of the dogs in this case could not be firmly established; all were purchased from Canadian sources. The kennel owners in this case had no knowledge of importation or of exposure to swine or swine offal, potential sources of exposure to B. suis (7–9). Although there is rationale for the diagnosis of B. suis biovar 3 in this case, the sum of evidence suggests infection by
The dogs in this case were initially diagnosed with B. canis infection on the basis of clinical history, serological testing, and bacterial culture. Novel findings included differences between male and female dogs in regards to both lesion distribution and
tissues most likely to yield bacteria. Further efforts to character- ize the recovered isolates by specialized laboratories yielded con- flicting interpretations (B. canis and B. suis biovar 3). Currently, 6 species of the genus Brucella are recognized (4). That the distinction between B. canis and B. suis is difficult should not be surprising; B. canis was once considered a biotype of B. suis, with considerable genetic and phenotypic overlap between them (5), emphasizing the complexity and necessary experience asso- ciated with speciating some members of such a closely related genus. Currently, Canada is considered free of B. suis biovar 3, the presence of which represents a significant concern to the swine industry, whereas B. canis is considered endemic (6). The origins of the dogs in this case could not be firmly established; all were purchased from Canadian sources. The kennel owners in this case had no knowledge of importation or of exposure to swine or swine offal, potential sources of exposure to B. suis (7–9). Although there is rationale for the diagnosis of B. suis biovar 3 in this case, the sum of evidence suggests infection by
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