indlaxman
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A 35-year-old man who recently traveled to a third world country develops chronic, severe dysentery.
Colonoscopy demonstrates ulceration of the cecum, and a cecal biopsy reveals 15-to-40 micron amoebae with
ingested erythrocytes and small nuclei with distinctive tiny central karyosomes. Which of the following organisms
is the most likely culprit?
A. Acanthamoeba sp.
B. Balantidium coli
C. Entamoeba histolytica
D. Giardia lamblia
E. Naegleria fowleri
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| bactitech
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C - Entamoeba histolytica. Key to ID on this Entamoeba is ingested RBC's. Other Entamoeba don't ingest RBC's. Also size is right. G. lamblia is much smaller. B. coli is HUGE - this size is too small. Acanth. doesn't occur in intestines, N. fowleri - epidemiology not right.
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| mdwannabe
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4 nuclei in egg... right? Or am I mixing it up?
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| bactitech
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It's not an egg, it's a cyst. Yes, you are correct. Trophozoite only has one nucleus.
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| bactitech
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http://www.med-chem.com/Para/Prob%20of%20Month/Pr...
Check this out - very interesting review of Entamoebas.
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| mdwannabe
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cyst..u right :-)
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