Changes

==Identification==

==Identification==

''Balantidium'' can be identified by their ciliary organelles on their surface membrances. They are 80μm long and have funnel-shaped depressions leading to the cytostome (mouth). ''Balantidium'' has two nuclei, one kidney shaped macronucleus and one small micronucleus. ''Balantidium'' also has contractile and food vacuoles, which is rare in parasitic protozoa.

''Balantidium'' can be identified by their ciliary organelles on their surface membrances. They are 80μm long and have funnel-shaped depressions leading to the '''cytostome''' (mouth). ''Balantidium'' has two nuclei, one kidney shaped macronucleus and one small micronucleus. ''Balantidium'' also has contractile and food vacuoles, which is rare in parasitic protozoa.

==Life Cycle==

==Life Cycle==

The host ingests a cyst which passes to the small intestine and undergoes encystation to produces trophozoites. The trophozoites remain in the intestinal lumen and reproduce by binary fission. They are then released with the faeces and encyst to form new cysts. The cysts are thick-walled, ensuring infection of a new host.

The host ingests a '''cyst''' which passes to the small intestine and undergoes encystation to produces '''trophozoites'''. The trophozoites remain in the intestinal lumen and reproduce by binary fission. They are then released with the faeces and encyst to form new cysts. The cysts are thick-walled, ensuring infection of a new host.

==Pathogenesis==

==Pathogenesis==