Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

	bannermenu

Case #338 - December, 2012

A 42-year-old pig farmer presented to his local medical facility with intermittent diarrhea and abdominal cramping. A stool specimen was collected in 10% formalin for laboratory testing. Figures A and C were captured at 200x magnification and show what was found in high numbers. Figures B, D, and E show a higher magnification (400x) of the same objects. What is your diagnosis? Based on what criteria?

	Case338_A

Figure A

	Case338_B

Figure B

	Case338_C

Figure C

	Case338_D

Figure D

	Case338_E

Figure E

Case Answer

This was a mixed infection with Ascaris lumbricoides and Balantidium coli. Morphologic features shown in the figures included:

  • unembryonated, fertile eggs of A. lumbricoides demonstrating a thick wall (Figures A-D) and with a mammillated layer (Figures C and D).
  • large smooth-walled cyst of Balantidium coli (Figures A and B).
  • trophozoite of B. coli demonstrating cilia, a large macronucleus, and a cytostome (Figures C and E).

More on: Ascariasis; Balantidiasis

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 education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit www.cdc.gov/parasites/.

  • Page last reviewed: August 24, 2016
  • Page last updated: August 24, 2016
  • Content source:
Top