Balantidium Coli – Life Cycle B. coli is a large ciliated protozoan. The life cycle of the protozoan comprises four stages: cysts, trophozoite, binary fission, and encystation.

Balantidium coli, the sole ciliated protozoan known to infect humans, is predominantly a parasite of swine but also affects a range of domestic and wild animals including camels, cattle and non ...