Li Gang, Li Bin, Lin Lin, Zhang Mao-tang, Liu Qu, Huang Wei, Xie Xian-qing, Chen Lin, Zhang Shun-xiang
Shenzhen Longgang Center for Disease Control and Prevention, Shenzhen 518172, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2013 Apr;34(4):371-3.
To compare the field epidemiological investigation and the criminal investigation on a nitrite poisoning event caused by deliberate contamination.
Cases were searched according to the definition of the disease. Information on the histories of onset and diet of all the cases and normal population on site, were investigated face to face. Information as ingredients, processing and sales of foods was also gathered. Samples were collected and nitrite detection were performed. Relevant materials were searched, cases were interviewed and data related to criminal results were collected.
Poisoned persons were staff of a big company in Longgang district of Shenzhen. The overall attack rate was 56.25% (63/112), with suspected and confirmed rates as 41.96% and 14.28%, respectively. The fatality rate was 3.17% (2/63). Clinical manifestation and effect of treatment were in accordance with the characteristics of an episode related to acute nitrite food poisoning in terms of factors as the time of onset, involving different age, sex and jobs of the patients. A total of 191 samples, including vomits from patients and seven batches of food and environment samples, were collected, with a positive detected rate of nitrite as 18.84%. Information gathered from the field environment, food distribution and processing supported the assumption that this was an incident of nitrite poisoning event with intention.
from the criminal investigation showed that the suspect stemmed from the market management rivalry, bought nitrite, dissolved and spread on food stalls F9 and F10.
This event of intentional nitrite release resulting in food contamination which further leading to food poisoning, was completely proved by the joint efforts of the teams and expertise from the field epidemiology survey and the criminal investigation.
比较针对一起因蓄意污染导致的亚硝酸盐中毒事件所开展的现场流行病学调查与刑事调查。
依据疾病定义搜索病例。对现场所有病例及正常人群的发病史和饮食情况进行面对面调查。还收集了食品的成分、加工和销售等信息。采集样本并进行亚硝酸盐检测。检索相关资料，对病例进行访谈并收集与刑事结果相关的数据。
中毒人员为深圳龙岗区一家大公司的员工。总罹患率为56.25%（63/112），疑似率和确诊率分别为41.96%和14.28%。病死率为3.17%（2/63）。从发病时间、涉及患者的不同年龄、性别和职业等因素来看，临床表现及治疗效果符合急性亚硝酸盐食物中毒事件的特征。共采集了191份样本，包括患者呕吐物以及7批次食品和环境样本，亚硝酸盐检测阳性率为18.84%。从现场环境、食品配送和加工收集到的信息支持了这是一起蓄意亚硝酸盐中毒事件的假设。刑事调查结果显示，嫌疑人因市场经营竞争，购买亚硝酸盐并溶解后泼洒在F9和F10号食品摊。
现场流行病学调查团队与刑事调查专家共同努力，充分证明了这起故意释放亚硝酸盐导致食品污染进而引发食物中毒的事件。
