Irvine W N, Gillespie I A, Smyth F B, Rooney P J, McClenaghan A, Devine M J, Tohani V K
Communicable Disease Surveillance Centre Northern Ireland, McBrien Building, Belfast City Hospital, Lisburn Road, Belfast, UK.
Epidemiol Infect. 2009 Oct;137(10):1449-56. doi: 10.1017/S0950268809002416. Epub 2009 Mar 19.
A large outbreak of Salmonella enterica serotype Newport infection occurred in Northern Ireland during September and October 2004. Typing of isolates from patients confirmed that this strain was indistinguishable from that in concurrent outbreaks in regions of England, in Scotland and in the Isle of Man. A total of 130 cases were distributed unequally across local government district areas in Northern Ireland. The epidemic curve suggested a continued exposure over about 4 weeks. A matched case-control study of 23 cases and 39 controls found a statistically significant association with a history of having eaten lettuce in a meal outside the home and being a case (odds ratio 23.7, 95% confidence interval 1.4-404.3). This exposure was reported by 57% of cases. Although over 300 food samples were tested, none yielded any Salmonella spp. Complexity and limited traceability in salad vegetable distribution hindered further investigation of the ultimate source of the outbreak.
2004年9月至10月期间，北爱尔兰发生了一起肠炎沙门氏菌新港血清型感染的大规模疫情。对患者分离株进行分型后确认，该菌株与英格兰部分地区、苏格兰和马恩岛同时期疫情中的菌株无法区分。北爱尔兰共有130例病例，在当地政府辖区内分布不均。疫情曲线表明，约4周内持续存在暴露情况。一项对23例病例和39例对照进行的配对病例对照研究发现，外出就餐时食用生菜的病史与病例之间存在统计学上的显著关联（比值比23.7，95%置信区间1.4 - 404.3）。57%的病例报告了这种暴露情况。尽管检测了300多个食品样本，但均未检出任何沙门氏菌属。沙拉蔬菜分销的复杂性和有限的可追溯性阻碍了对疫情最终源头的进一步调查。
