Cholera Prevention During Foreign Travel
Although cholera calls up visions of medieval plagues and can be a major cause of anxiety in tourists, it is really very hard to catch. The risk of cholera has been estimated at two cases per million travelers.
Cholera is a problem in areas where significant amounts of human waste contaminate food or water. The level of contamination must be very high, because a large number of the cholera bacteria must be ingested to cause the disease. This causes the food to smell or taste so bad that few tourists are tempted to eat it. Occasionally, the foul taste is covered with spicy sauces. Raw shellfish have been a source of disease in some areas.