Case #170 – December, 2005
A lab worker discovered an unlabeled box of 20 pathology slides, which appeared to be stained with hematoxylin and eosin (H & E). The slides were examined to determine what was on them. Figure A shows what was seen on one of the slides at 200× magnification. What is your identification? Based on what criteria?
The object shown was the encapsulated larva of a nematode in the genus, Trichinella. The lab worker later found the key to the slide tray, which stated the slide showed Trichinella spiralis. A species determination should not be made based on just the specimen in this case; geographic, biologic, and clinical information should be considered before a species is given.
More on: Trichinellosis
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/.