合肥市即食肉类食品中金黄色葡萄球菌污染情况及耐药和基因型分布
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(1.安徽医科大学第四附属医院,安徽 合肥 230032;2.安徽省卫生厅卫生监督所, 安徽 合肥 230001;3.安徽省合肥市京东方医院,安徽 合肥 230001)

作者简介:

吴航 男 主管检验师 研究方向为微生物食品安全 E-mail:wuhang1432@163.com通信作者:┣┣(中)通信作者┫┫沈继录 男 教授 研究方向为医学检验 E-mail:shenjilu@126.com

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基金项目:

安徽省转化医学研究院科研基金资助项目(2017zhyx14)


Staphylococcus aureus contamination, drug resistance and genotype distribution in ready-to-eat meat products in Hefei
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(1.the Fourth Affiliated Hospital of Anhui Medical University, Anhui Hefei 230032, China;2.Anhui Provincial Health Supervision Institute, Anhui Hefei 230001, China;3.Hefei Jingdongfang Hospital, Anhui Hefei 230001, China)

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    摘要:

    目的 调查合肥市即食肉类食品中金黄色葡萄球菌的污染情况,并对分离株进行耐药性分析及多位点序列分型研究。方法 2017年10月—2018年10月自合肥市区范围内的超市和开放型菜市场共采集744份即食型肉类食品样品。根据GB 4789.10—2016《食品安全国家标准 食品微生物学检验 金黄色葡萄球菌检验》中的方法对样品进行金黄色葡萄球菌定性和定量分析,采用K-B纸片扩散法检测分离株的耐药性,采用多位点序列分型法对分离株进行ST分型,使用MEGA 7.0绘制聚类树状图。结果 样品中金黄色葡萄球菌检出率为4.2%(31/744),其中卤肉制品检出率最高为8.1%(15/185),其次为烤肉制品(6.3%,11/174),定量分析显示超过90%的样品金黄色葡萄球菌污染水平在0.3~<10 MPN/g范围内。耐药性分析结果显示80.6%(25/31)的菌株对青霉素G耐药,40%以上的菌株对链霉素、红霉素和卡那霉素耐药;多重耐药菌株占比为61.3%(19/31)。分型分析共获得8个ST型,分别为ST6、ST7、ST15、ST59、ST72、ST188、ST398和ST2196型,其中以ST188和ST72型为主。结论 合肥市卤肉和烤肉制品中存在金黄色葡萄球菌污染,且多重耐药菌株比例较高,对消费者的健康有潜在威胁,有必要持续监测污染率、菌株耐药和基因型流行趋势,完善合肥市食源性金黄色葡萄球菌感染的风险评估。

    Abstract:

    Objective To investigate the prevalence, antimicrobial susceptibility, and genetic characteristics of Staphylococcus aureus from ready-to-eat meats in Hefei. Methods Five hundred and fifty ready-to-eat meats samples were collected from supermarkets and open vegetable markets in Hefei. All samples were subjected to qualitative and most probable number (MPN) analysis for S.aureus according to the National Food Safety Standard Food Microbiological Examination:Staphylococcus aureus (GB 4789.10-2016). Antimicrobial susceptibility of all isolates was evaluated using the Kirbye-Bauer disk diffusion. The sequence types (ST) of S.aureus were performed via multilocus sequence typing (MLST), and phylogenetic tree was constructed by MEGA 7.0 software. Results In total 744 samples, 4.2% (31/744) were positive for S.aureus, of which the most contaminated foods were stewed meat(8.1%, 15/185)followed by roast (6.3%, 11/174). Most probable number (MPN) analysis showed that 90% of the samples were ranged in 0.3-<10 MPN/g. The result of antimicrobial susceptibility analysis showed that 80.6% (25/31) of the isolates were resistant to penicillin G, more than 40% of the isolates were resistant to streptomycin, erythromycin and kanamycin, and 61.3% (19/31) isolates were multidrug resistant. In addition, 8 sequence types (ST6, ST7, ST15, ST59, ST72, ST188, ST398 and ST2196) were obtained by multilocus sequence typing, and ST188 and ST72 were the main genotypes. Conclusion S.aureus contamination exists in stewed meat and roast meat in Hefei, and the ratio of multi-drug resistant strains was high, which had potential threat to the health of consumers.It was necessary to continuously monitor the contamination rate, bacterial resistance and genotype epidemic trend, and improve the risk assessment of foodborne S.aureus infection in the region.

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吴航,沈继录,高德玉.合肥市即食肉类食品中金黄色葡萄球菌污染情况及耐药和基因型分布[J].中国食品卫生杂志,2019,31(4):339-344.

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  • 收稿日期:2019-04-21
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  • 在线发布日期: 2019-09-16
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