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Cytology or culture in dogs with otitis externa?
This question is raised daily in small animal practice: Cytology offers quick, easy and inexpensive identification of the organisms involved in the otitis. But does it correlate with bacterial or mycological cultures? 100 samples were examined and find only an 68% agreement.

Otic exudate was obtained from 33 dogs with otitis externa for cytopathology and culture.

Two samples were taken from the same location in the external ear canal, for a total of 100 samples.

Thirty-six (36%) samples isolated only a single organism, of which 21 (21%) were Malassezia spp. Two organisms were present in 23 (23%) of the samples.

Cultures of the two samples agreed in 40 (80%) of the 50 pairs.
Cytopathology agreed with culture results only 68% of the time.

Cytopathology and culture may not be as definitive as previously assumed because of apparent variability of the microbial population within the external canal.

Source: Christine A. Graham-Mize, Edmund J. Rosser (2004): Comparison of Microbial Isolates and Susceptibility Patterns From the External Ear Canal of Dogs With Otitis Externa. In: Journal of the American Animal Hospital Association 40:102-108 (2004)





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SMALL ANIMAL PRACTICE

Reference intervals for blood parameters in Shetland Sheepdogsmembers
Several breeds have physiological peculiarities that induce variations in reference intervals (RIs) compared with the general canine population. Shetland sheepdogs (SSs) are reported to be more predisposed to different diseases (eg, hyperlipidemia, gallbladder mucocele, and hypothyroidism). Consequently, a breed‐specific approach is more often required. Thus, the aim of this study was to determine whether the RIs of the general canine population could be applied to that of SSs, and to generate breed‐specific RIs, where appropriate.

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