The balantidium coli is a normal inhabitant of the large intestine of the hog. It is also occasionally found in the feces of other normal animals, as the dog and cat, but these animals probably become infected by dirt or food previously contaminated by the feces of swine. It is sometimes found in human feces in connection with disease of the intestine, as diarrhea and dysentery, but probably never in the healthy intestine. About thirty instances of infection in man have been reported, mostly from northern Europe, a number from Sweden. Strong and Musgrave1 reported a case from Manila. In The Journal2 reference was made to a case described by Solowjew. The parasite is believed by most writers to be accidentally present and, while finding favorable conditions for growth in the diseased intestine, to probably have no etiologic relation to the diarrhea.
This view is opposed by other
THE BALANTIDIUM COLI (STEIN) IN INTESTINAL DISEASES. JAMA. 1902;XXXVIII(19):1234–1235. doi:10.1001/jama.1902.02480190040006
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