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Among a United States military unit of 170 personnel deployed to Utapao, Thailand for a three-week training exercise, 40% experienced diarrheal disease, and 12% sought medical treatment for diarrhea. Most illness clustered within the first two weeks of arrival and individuals were ill an average of 3.6 days. Fifty-five percent of cases lost two days of work and 15% required treatment with intravenous fluids. Bacterial pathogens were recovered from 38% of 16 stools submitted, with Campylobacter jejuni the most common. Four (12.5%) of 32 persons who voluntarily submitted paired sera exhibited a four-fold increase in IgG antibody titer to C. jejuni. Traveler's diarrhea continues to be an important problem with a serious potential to impact the mission readiness of even small military units deployed overseas.