http://en.wikipedia.org/wiki/Balantidium_coli
Infection occurs when the cysts are ingested, usually through contaminated food or water. Balantidium infection in immunocompetent individuals is not unheard of, but it rarely causes a serious disease of the gastrointestinal tract. It can thrive in the gastrointestinal tract as long as there is a balance between the protozoan and the host without causing dysenteric symptoms. Infection most likely occurs in people with malnutrition due to the low stomach acidity or people with immune compromised systems.
Infection occurs when the cysts are ingested, usually through contaminated food or water. Balantidium infection in immunocompetent individuals is not unheard of, but it rarely causes a serious disease of the gastrointestinal tract. It can thrive in the gastrointestinal tract as long as there is a balance between the protozoan and the host without causing dysenteric symptoms. Infection most likely occurs in people with malnutrition due to the low stomach acidity or people with immune compromised systems.
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