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Case #520 - July, 2020

A 67-year-old male from Houston, TX sought medical evaluation following 3 days of abdominal pain, diarrhea, and fatigue after returning from a two-week summer vacation in Nairobi, Kenya. Examination of a trichrome stained Zn-PVA stool smear submitted for routine ova and parasite (O&P) revealed objects shown in Figures AD, ranging in size from 12-25μm. What is your diagnosis? Based on what criteria?

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Images presented in the monthly case studies are from specimens submitted for diagnosis or archiving. On rare occasions, clinical histories given may be partly fictitious.

DPDx is an educational resource designed for health professionals and laboratory scientists. For an overview including prevention, control, and treatment visit www.cdc.gov/parasites/.

Page last reviewed: December 10, 2020