It is most common in less developed countries that have poor sanitation facilities.
People often get the disease as a result of drinking water contaminated with cholera bacteria.
Foods such as shellfish and raw fruits and vegetables may also harbor the bacteria. Cause A comma-shaped bacterium called Vibrio cholerae causes cholera. Once vibrio bacteria are swallowed, they infect the mucous membrane of the small intestine. A toxin produced by the bacteria then makes bodily fluids flow quickly from the bloodstream into the intestines. Sudden, severe diarrhea and dehydration follow, leading to serious problems if left untreated.