South of the border, it is turista or "the Aztec two-step." In Asia, visitors from the West call it "Delhi belly." By any name, traveler's diarrhea, a debilitating digestive upset caused by a change in the system's bacterial population, is a synonym for misery that can spoil a trip and jeopardize the victim's health. The standard prophylactic for many years has been Entero-Vioform, a drug so frequently used that it is the traveler's best friend. That fond relationship has come under challenge by the American Medical Association. The A.M.A. Journal has not only questioned Entero-Vioform's effectiveness, but cautions that its heavy...
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