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Case #497 – August, 2019
A 21-year-old exchange student from Nigeria presented to the University Clinic with a 3-day history of diarrhea, mild abdominal pain, loss of appetite, and fatigue. Stool samples collected in 10% formalin and Zn-PVA fecal preservatives were sent to the laboratory for analysis. Figures A–D show organisms seen by the technologist in a trichrome-stained slide of the Zn-PVA sample. The organisms ranged in size from 12-26 μm. What is your diagnosis? Based on what criteria? What other testing, if any, would you recommend?
![Case497_A Figure A](/dpdx/images/casestudies/2019/Case497_A.jpg?_=23920)
Figure A
![Case497_B Figure B](/dpdx/images/casestudies/2019/Case497_B.jpg?_=23920)
Figure B
![Case497_C Figure C](/dpdx/images/casestudies/2019/Case497_C.jpg?_=23913)
Figure C
![Case497_D Figure D](/dpdx/images/casestudies/2019/Case497_D.jpg?_=23915)
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.
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/.