Protozoal Diseases of the Digestive System

Protozoal Diseases of the Digestive System - Protozoal...

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Protozoal Diseases of the Digestive System Amoebic dysentery. Amoebic dysentery  is caused by the amoeba  Entamoeba histolytica.   This  protozoan exists in nature in the  cyst  form and is transmitted by contaminated food and water. In  patients, the amoebas revert to  trophozoites  (feeding forms) and invade the intestinal lining. Then  they enter the bloodstream and move to distant organs, such as the liver and lung. Infected  individuals pass the cysts in stools and remain carriers for long periods. A drug called metronidazole  is used for therapy.  Giardiasis. Giardiasis  is a protozoal disease caused by the flagellate  Giardia lamblia.   The  organism is taken into the body in its cyst form in contaminated food and water. In the intestine, the  trophozoites emerge from the cysts and multiply along the walls of the intestine. A foul-smelling,  watery discharge accompanies the infection, followed by abdominal pain and diarrhea. Hikers, 
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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