Case #361 – December 2013

A 27-year-old man in the U.S. Army, who had been stationed overseas in southeast Asia, sought medical attention for nausea, vomiting, and intermittent diarrhea. A stool specimen was collected in 10% formalin for Ova and Parasites (O&P) testing. A formalin-ethyl acetate (FEA) concentration was performed and a wet mount examined using 1000x magnification.  Figures A-E show what was observed in few numbers. The objects in Figures AC measured 18 micrometers on average; objects in Figures D and E measured 8.0 micrometers on average. Figures B and C shows two different focal planes of the same object. 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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