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Representative photomicrographs of colonic mucosal biopsy specimens obtained from a normal cat (first panel) and a cat with naturally occurring T. foetus infection on which estimates of the multiplicity of infection in vivo were based (second through fourth panels). Biopsy specimens were formalin fixed, paraffin embedded, sectioned at a thickness of 7 μm, and stained with a modified hematoxylin and eosin stain.
