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1997年6～7月,美国密执安州与弗吉尼亚州同时爆发大肠埃希菌O157∶H7感染,感染率明显高于往年同期水平。作者对此进行了流行病学、环境及实验室调查,结果表明两州O157∶H7爆发都是由种子受污染的苜蓿新芽所致。 流行病学调查:在此期间,密执安州共有64人感染O157∶H7,为1996年同期的2倍。在发病的38人(中位年龄为31岁)中,95％为血性腹泻,47％住
From June to July 1997, the Escherichia coli O157: H7 outbreak was reported in Michigan and Virginia at the same time. The infection rate was significantly higher than the same period in previous years. The authors conducted an epidemiological, environmental and laboratory investigation, the results show that the two states O157: H7 outbreaks are caused by seed contaminated alfalfa sprouts. Epidemiological survey: During this period, a total of 64 people in Michigan State infected O157: H7, doubling the same period in 1996. Of the 38 people who were affected (median age, 31 years), 95% had bloody diarrhea and 47% lived