Case #237 – October, 2008

A 28-year-old man had loss of appetite, weight loss, and intermittent diarrhea approximately one week after attending a family reunion located on a farm in the mid-western U.S. He sought medical attention with his primary care provider who collected a stool specimen for ova and parasite (O&P) examination using a single-vial fixative system. A stool smear was prepared, stained with trichrome, and examined at 1000x magnification. The objects shown in Figures AD were observed in moderate numbers. Objects in Figures C and D were 12 and 15 micrometers in diameter respectively. The object in Figure E was 4 micrometers in diameter. What is your diagnosis? Based on what criteria?

Figure A

Figure B

Figure C

Figure D

Figure E

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

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