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outbreak of acute gastroenteritis attributable to escherichia coli serotype o104:h21--helena, montana, 1994.during february-march, 1994, four persons in helena, montana (1995 population: 24,569), developed bloody diarrhea and severe abdominal cramps. stool cultures for salmonella, shigella, campylobacter, and escherichia coli o157:h7 were negative; however, sorbitol-negative e. coli colonies were identified in stools from all four patients. isolates from three patients were identified at cdc as a rare serotype--e. coli o104:h21 that produced shiga-like toxin ii. this report summarizes the epidemiologi ...19957596334
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