Figure 2: (a) Cyst forms are excreted in the faeces of infected hosts, (b) Man acquires infection by consumption of food/water contaminated with faeces containing cysts, (c) Excystation occurs in the large intestine to release the vacuolar form. The vacuolar form (c1) can transform into the granular form (c2) or the amoeboid form (c3) and vice versa. The vacuolar form multiplies by binary fission (other modes of reproduction such as plasmotomy and budding can also occur). The vacuolar form undergoes encystation in the lumen of the large intestine to produce the cyst form which is shed in the faeces