Balantidium coli

Balantidium coli

Images:

Trophozoites: 
http://www.k-state.edu/parasitology/625tutorials/Balantidium.html
Cysts: 
http://www.k-state.edu/parasitology/625tutorials/Ciliates.html

Phylogeny:
Phylum Ciliophora

Preferred definitive host:
Humans

Reservoir hosts:
Pigs, guinea pigs, rats, other mammals.

Intermediate/vector hosts:
None

Geographical location:
Most common in Philippines, but is cosmopolitan

Organs affected:
Cecum and colon

Symptoms:
Proteolytic enzymes digest the intestinal epithelium of the host. Ulcer is flask-shaped, and causes lymphocytic infiltration, hemorrhage, secondary bacterial infection. Large intestine and appendix may be perforated.

 Treatment:
Carbarsone, diiodohydroxyquin, tetracycline. Epidemiological control and treatment are similar to those of E. histolytica.