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Question 213 / 280
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CLINICALPATHOLOGY-178
ISOSPORA BELLI (now Cystoisospora belli) is a coccidian parasite. What is the characteristic egg/oocyst morphology in stool?
A. Small round acid-fast oocysts 4–6 µm
B. LARGE OVAL OOCYSTS (23–33 µm × 12–16 µm) with thin shell containing 1–2 SPOROBLASTS; acid-fast positive on modified ZN stain
C. Barrel-shaped with bipolar plugs
D. Hexagonal flat plate-shaped crystals
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