Presentation of Case First admission (1966). A 47-year-old woman was admitted to the hospital because of diarrhea.She was well until two years earlier, when a cholecystectomy was followed by crampy lower abdominal pain and the urgent passage of loose, watery stools of small volume, often accompanied by mucus, without blood or pus. The attacks lasted for three to four days and were followed by a symptom-free interval during which she passed two to three stools daily. Eight months before entry she traveled to Mexico and noticed exacerbation of the symptoms. Repeated stool cultures gave no growth of pathogenic bacteria. . . .
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