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Case #522 - August, 2020

At a regional diagnostic laboratory, where specimens from the southeastern United States are evaluated, the objects shown in Figures A and B were observed on a wet mount preparation from a fecal formalin-ethyl acetate (FEA) concentrate. The objects measured approximately 160 micrometers in length. What is your diagnosis? Based on what morphologic features?

Figure A

Figure A

Figure B

Figure B

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: December 9, 2020