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Case #251 - May, 2009

A 45-year-old pig farmer from rural Georgia presented to his health care provider with abdominal pain, cramps and diarrhea. Stool specimens were collected in polyvinyl alcohol (PVA) and 10% formalin for ova and parasite (O&P) examination. The objects in Figures A and B, which measured on average 90 micrometers in length, were observed in low numbers in formalin-concentrated wet mounts of the stool. The objects in Figures C and D, which measured on average 12 micrometers in diameter, were seen in moderate numbers on trichrome-stained slides prepared from the PVA-preserved stool. 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.

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