Case #256 – July, 2009

A 25-year-old refugee from Myanmar was screened for parasites at a local clinic in Tennessee. Stool specimens were collected in 10% formalin and polyvinyl alcohol (PVA) and sent to the state health laboratory for ova and parasite (O&P) work-up. Figures AD show what was observed in a concentrated wet mount made from the formalin-preserved stool. Figures A and B show what was observed under brightfield microscopy; Figures C and D show the same fields, respectively, observed under UV microscopy. All images were captured at 400x magnification. The objects of interest measured on average 17 micrometers long by eight micrometers wide. What is your diagnosis? Based on what criteria?

Figure A

Figure B

Figure C

Figure D

This case, and the specimen from which images were taken, were kindly provided by the Tennessee Department of Health, Laboratory Services.

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