Microscopy Challenge: Protozoa in Cat Feces

A diagnostic parasitology challenge: differentiating protozoa in a cat fecal sample using flotation and Lugol's solution staining.

Editorial team 1 min August 26, 2025

Native preparation of cat feces, flotation, Lugol's solution stain

Cat fecal flotation preparation at high magnification

Cat fecal micropreparation at low magnification, 40x objective

Cat fecal preparation at 1000x immersion magnification

Microscopic preparation of cat feces at 40x magnification

Field of view of cat fecal micropreparation with additional phone zoom

Anonymous question from a subscriber. Please tell me, is it isospora or toxoplasma - video and photos 2,3,4 at 1000x magnification, photo 5 at 40x magnification, photo 6 at 40x magnification + phone zoom? And photos 7,8, are they amoeba cysts? Lugol’s stain, cat feces, flotation

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