On November 27, 2007, a local health officer in central Massachusetts contacted the Massachusetts Department of Public Health (MDPH) to report listeriosis in a man aged 87 years. Pulsed-field gel electrophoresis (PFGE) performed on the patient's Listeria monocytogenes isolate produced a pattern indistinguishable from that of isolates from three other cases identified in residents of central Massachusetts in June, October, and early November 2007. MDPH, in collaboration with local public health officials, conducted an investigation, which implicated pasteurized, flavored and nonflavored, fluid milk produced by a local dairy (dairy A) as the source of the outbreak. This report summarizes the results of that investigation. In all, five cases were identified, and three deaths occurred. This outbreak illustrates the potential for contamination of fluid milk products after pasteurization and the difficulty in detecting outbreaks of L. monocytogenes infections.

译文

2007年11月27日,马萨诸塞州中部的一名当地卫生官员联系了马萨诸塞州公共卫生部 (MDPH),报告了一名87岁男子的李斯特菌病。对患者的单核细胞增生李斯特菌分离株进行的脉冲场凝胶电泳 (PFGE) 产生的模式与6月,10月和2007年11月早期在马萨诸塞州中部居民中发现的其他三例分离株的模式无法区分。MDPH与当地公共卫生官员合作进行了一项调查,该调查涉及当地乳制品 (dairy a) 生产的巴氏杀菌,调味和非调味的流质牛奶是爆发的源头。本报告总结了调查结果。共发现5例病例,3例死亡。这次爆发说明了巴氏消毒后液体奶制品可能受到污染,并且很难检测到单核细胞增生李氏杆菌感染的爆发。

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