Prevalence and characterization of Salmonella isolated from raw vegetables in China
Prevalence and characterization of Salmonella isolated from raw vegetables in China
复制标题
中国生蔬菜中沙门氏菌的流行情况及特征
DOI：
10.1016/j.foodcont.2019.106915
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发表时间：
2020-03-01
期刊：
影响因子：
6
通讯作者：
Zhang, Youxiong
中科院分区：
文献类型：
--
作者：
Yang, Xiaojuan;Wu, Qingping;Zhang, Youxiong
生蔬菜与许多食源性沙门氏菌爆发有关;然而，在中国，生蔬菜中沙门氏菌污染物的流行病学或分子数据很少。本研究调查了中国生食蔬菜中沙门氏菌的流行情况和分子特征。总共采集了406个生蔬菜样本，覆盖了中国大部分省会城市。沙门氏菌的总患病率为3.4%（14/406），污染水平< 1 MPN/g。香菜（7.8%，n = 90）和生菜（6.0%，n = 83）的污染率最高。在从14份阳性样品中回收的31株沙门氏菌中，鉴定出14种不同的血清型和15种多位点序列分型模式。所有确定的血清型以前都曾引起人类感染，其中几种还与生蔬菜相关疾病的爆发有关。在15株非重复分离株中，7株（46.7%）对至少一类抗生素耐药，4株（26.7%）为多重耐药。耐药率最高的是萘啶酸（33.3%）。本研究对我国生食蔬菜中沙门氏菌的流行情况进行了系统监测，提示新鲜蔬菜中沙门氏菌污染对公众健康具有潜在的危害。
Raw vegetables have been associated with numerous foodborne Salmonella outbreaks; however, there is little epidemiological or molecular data on Salmonella contaminants of raw vegetables in China. Here, we investigated the prevalence and molecular characteristics of Salmonella isolates from raw vegetables in China. In total, 406 raw vegetable samples were collected covering most provincial capitals in China. The overall prevalence of Salmonella was 3.4% (14/406), with contamination levels of < 1 MPN/g. Coriander (7.8%, n = 90) and lettuce (6.0%, n = 83) showed the highest contamination rates. Among the 31 Salmonella isolates recovered from the 14 positive samples, 14 different serovars and 15 multilocus sequence typing patterns were identified. All of the identified serovars have previously caused infections in humans, with several also linked to raw vegetable-associated disease outbreaks. Of the 15 non-duplicate isolates, 7 (46.7%) were resistant to at least one class of antibiotics and 4 (26.7%) were multidrug-resistant. The highest rate of resistance was observed for nalidixic acid (33.3%). This study provides a systematical surveillance on prevalence of Salmonella in Chinese raw vegetables, and suggests that the Salmonella contamination of fresh vegetables is a potential risk to public health when they are eaten raw.