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Case #346 - April, 2013

A 21-year-old exchange student from Nepal sought medical attention for intermittent diarrhea associated with mild abdominal cramps. A stool specimen was collected for laboratory testing in low viscosity polyvinyl alcohol (LV-PVA). A smear was made from the preserved stool and stained with trichrome. Figures AD show what was observed in moderate numbers at 1000x magnification with oil; Figures A and B show the same object in different focal planes. The size of the objects ranged from 15-20 micrometers in diameter. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Figure D

Figure D

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.

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Page last reviewed: August 24, 2016