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An outbreak of Bacillus cereus
food poisoning resulting from contaminated vegetable sprouts.
Am J Epidemiol 1976 Jun;103(6):589-94
Portnoy BL, Goepfert JM, Harmon SM.
In an outbreak of gastrointestinal illness caused by consumption of home-grown
raw vegetable sprouts contaminated by Bacillus cereus, victims developed
symptoms after an incubation period of 6-15 hours. Four persons initially
experienced nausea and vomiting, and this was followed in 3 cases by abdominal
cramps and diarrhea. Bacteriologic investigation indicated that B. cereus on
unsprouted seeds proliferated during germination in a commercially sold seed
sprouting kit and reached levels in excess of 10(7) per gram. B. cereus isolated
from the incriminated sprouts exhibited enterotoxigenic activity when tested by
the ligated rabbit ileal loop technique, the dermal reaction in guinea pigs, and
the rabbit skin capillary permeability test. The diversity of symptoms and
incubation periods attributed to B. cereus requires analysis for this often
overlooked organism whenever food-borne gastroenteritis is suspected.
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