Abstract
The optimal microscopic magnification and number of optical fields of adhesive tape strip cytological slides that should be examined when searching for Malassezia yeasts on canine skin are unknown. To determine the optimal magnification and the minimum number of optical fields that should be examined to maximise intraobserver repeatability and interobserver reproducibility. Seven experienced examiners counted, twice, the number of yeasts in 10, 20, 30, 40 and 50 optical fields of 40 slides at ×400 and ×1000 magnification. The number of yeasts per unit surface area was significantly higher at ×1000 compared to ×400 magnification. Repeatability and reproducibility for counting the yeasts was very poor. Adhesive tape strip cytological slides should be examined microscopically for Malassezia spp. at ×1000 magnification. The repeatability of this examination for counting the yeasts is poor.
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