Case #178 – April, 2006

A 29-year-old man went to a local health clinic with complaints of intermittent diarrhea for a few months. He did not report any other symptoms but said he had difficulty sleeping sometimes. A stool specimen was collected and preserved in both 10% formalin and polyvinyl-alcohol (PVA). An ova and parasite (O & P) examination was performed. Figure A shows what was seen on a concentrated wet mount preparation, and Figure B shows what was seen on a wet mount stained with iodine. Figures C and D show what was seen on a trichrome stained smear made from the PVA preserved specimen. Objects measured 7 to 10 µm in diameter. What is your diagnosis? Based on what criteria?

Figure A

Figure B

Figure C

Figure D

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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