Acute Disease Investigation and Control Section, Minnesota Department of Health, St. Paul, Minnesota 55164-0975, USA.
Foodborne Pathog Dis. 2010 Aug;7(8):995-7. doi: 10.1089/fpd.2009.0495.
Salmonella is the most common bacterial cause of foodborne outbreaks in the United States. Starting in June 2007, investigation of a cluster of Salmonella Montevideo cases with indistinguishable pulsed-field gel electrophoresis (PFGE) patterns resulted in the identification of an outbreak associated with contact with chickens purchased from a single hatchery. Nine Minnesota cases from May through August 2007 were part of this outbreak. Cases with the outbreak PFGE pattern of Salmonella Montevideo continued to occur in Minnesota after August, but none of these cases reported chicken contact. The majority of these cases resided in the same town in rural Minnesota. Routine interviews revealed that all cases from these counties purchased groceries from the same local grocery store, with two specifically reporting consuming items from the grocery store delicatessen in the week before illness. As a result, an investigation into the delicatessen was initiated. Illness histories and stool samples were collected from all delicatessen employees, and food and environmental samples were collected. None of the employees reported experiencing recent gastrointestinal symptoms, but the outbreak PFGE subtype of Salmonella Montevideo was identified from stool from two food workers. Food and environmental samples collected tested negative for Salmonella. One of the positive employees reported having chickens at home, but the animals did not test positive for Salmonella. The positive food workers were excluded from work until they had two consecutive negative stool cultures for Salmonella. There was no evidence of ongoing transmission thereafter. This was an outbreak of Salmonella Montevideo infections that began as an animal-contact-associated outbreak which subsequently resulted in a foodborne outbreak associated with infected food workers. These outbreaks illustrate the complex epidemiology of salmonellosis.
沙门氏菌是美国最常见的食源性疾病爆发的细菌原因。从 2007 年 6 月开始，对一组具有不可区分的脉冲场凝胶电泳 (PFGE) 模式的沙门氏菌蒙特维迪奥病例进行调查，导致鉴定出与接触从单个孵化场购买的鸡有关的爆发。2007 年 5 月至 8 月期间，明尼苏达州有 9 例病例与此次爆发有关。2007 年 8 月以后，明尼苏达州继续发生与暴发相关的沙门氏菌蒙特维迪奥 PFGE 模式的病例，但这些病例均无鸡接触史。这些病例的大部分居住在明尼苏达州农村的同一个城镇。常规访谈显示，来自这些县的所有病例均从同一家当地杂货店购买食品杂货，其中有两人特别报告在患病前一周从杂货店熟食店购买食品。因此，对熟食店展开了调查。从所有熟食店员工中采集了疾病史和粪便样本，并采集了食品和环境样本。没有员工报告近期有胃肠道症状，但从两名食品工人的粪便中发现了暴发相关的沙门氏菌蒙特维迪奥亚型。采集的食品和环境样本检测均未发现沙门氏菌。其中一名阳性员工报告家中有鸡，但动物未检测出沙门氏菌。阳性食品工人在连续两次粪便培养沙门氏菌阴性之前被排除工作。此后没有发现传播的证据。这是一起沙门氏菌蒙特维迪奥感染的爆发，最初是动物接触相关的爆发，随后导致与受感染的食品工人有关的食源性爆发。这些暴发说明了沙门氏菌病的复杂流行病学。
