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Monthy Case Studies - 2012

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?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Figure D

Figure D

Figure E

Figure E

Show Answer


Answer to Case #338

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

More on: Balantidiasis

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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.

 
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  • Page last reviewed November 29, 2013
  • Page last updated November 29, 2013
  • Content source: Global Health - Division of Parasitic Diseases and Malaria
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