Case #340 – January, 2013
The DPDx Team received a pair of proglottids from a state health lab for cestode confirmation and identification. The specimens were submitted in 70% ethanol and measured on average 12.0 mm long by 3.0 mm wide. The proglottids were reportedly found in the feces of a 43-year-old woman with no documented international travel. Figures A and B show one of the proglottids. Figures C and D show the same proglottid after soaking in lactophenol for several hours. What is your diagnosis? Based on what criteria?
This was a case of taeniasis caused by the beef tapeworm, Taenia saginata. Diagnostic morphologic features included:
- a single, prominent lateral genital pore (GP, Figure D).
- more than 13 primary uterine branches on either side of the central uterine stem (Figures C and D).
More on: Taeniasis
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/.