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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

Radioactive iodine uptake in hyperthyroid cats after rh-TSHmembers
Radioactive iodine therapy is considered the treatment of choice for hyperthyroidism in cats, but the availability of this modality is limited by costs and hospitalization requirements. Administration of recombinant human thyroid stimulating hormone (rh‐TSH) to humans with thyroid neoplasia or nodular goiter can increase thyroidal iodine uptake, thereby allowing the use of lower radioactive iodine doses for treatment. Veterinary studies of this subject are limited, and results are conflicting. Thus, the objective of this study was to investigate the effects of rh‐TSH administration on thyroidal iodine uptake in hyperthyroid cats.

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