The cyst form of Balantidium coli is the infective stage. It has one large kidney-shaped macronucleus and one small, round micronucleus. The troph is quite large, measuring 50 to 150 µm in length and 40 to 70 µm in width. What single feature is associated with this organism?
a. Falling leaf motility
b. Shepherd's crook
c. Presence of oocytes
d. Cilia covering the troph
D
B. coli trophs have one large kidney-shaped macronucleus and one small, round micronucleus, which is difficult to see, even in the stained smear. The macronucleus may be visible in an un-stained preparation. The single feature associated with this organism is a body that is covered with cilia, which tend to be longer near the cytostome. Cytoplasm may be vacuolated.
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