2. Causes

Most often, the cause of travelers diarrhea is eating or drinking a contaminated substance. The most common contaminant is feces, human or animal. The immune systems of people who live fulltime in the locale become used to these bacterial organisms, which explains why they don't get sick. An immune system unaccustomed to that specific bacteria, however, will reject it and the body will become sick. Some people believe travelers diarrhea can also stem from the stress of traveling or changes in diet.

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