http://en.wikipedia.org/wiki/Dysentery
Dysentery is an illness involving severe diarrhea that is often associated with blood in the feces. It is caused by ingestion of food containing bacteria, causing a disease in which inflammation of the intestines affect the body significantly. There are two major types: shigellosis, which is caused by one of several type of Shigella bacteria; and amoebic dysentery, which is caused by the amoeba Entamoeba histolytica.