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Case #358 - October, 2013

A 26-year-old female college student had undergone a homeopathic regimen advertised to eliminate parasites from the body. The only travel reported was to Maine a year ago to live with relatives on a farm between semesters. After experiencing recent mild to moderate abdominal discomfort, she sought medical attention to confirm that her home remedy was effective. A stool specimen was collected and tested for ova-and-parasites (O&P) by her primary health care provider. Figures AC show examples of what was observed in low numbers in a formalin-ethyl acetate (FEA) concentration of the stool. Figure A is at 200x magnification; Figures B and C show the two objects of interest individually at 400x magnification. The objects measured 31 micrometers in diameter on average. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

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: August 24, 2016