Posted by mike from IP 24.239.129.200 on February 28, 2006 at 16:29:45:
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