All are true about Balantidium coli except:: (A) It is a protozoa, (B) Cyst is the infective stage, (C) Usually invades liver, (D) It is the largest protozoan parasite inhabiting large intestine in man
Answer is C. Balantidium coli Only ciliate protozoa and the largest causing human disease (ciliate dysentery). Infective stage: binucleate cyst; spherical, ellipsoid, 50-75mm, double layered cyst wall. The invasive form is the trophozoite - 80-120mm; two nuclei (macronucleus, micronucleus), peristome, cytostome, cytopharynx, cytopyge.