云南省食品中金黄色葡萄球菌耐药性和mecA基因的检测及分析
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(云南省疾病预防控制中心,云南 昆明 650022)

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杨庆文 女 主任技师 研究方向为食品安全和微生物检测 E-mail:yqwann @163.com┣┣(中)通信作者┫┫

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云南省重大传染病疫苗研发重点实验室开放研究基金项目(2016KF001)


Detection of mecA resistance gene and the antimicrobial susceptibility of foodborne Staphylococcus aureus in Yunnan Province
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(Yunnan Center for Disease Control and Prevention, Yunnan Kunming 650022,China)

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    摘要:

    目的 调查2010—2016年云南省不同食品中分离的金黄色葡萄球菌的抗生素耐药情况,了解多重耐药(MDR,即耐3类或3类以上抗生素)菌株和耐甲氧西林金黄色葡萄球菌(MRSA)分布以及mecA基因的携带率,为有效防控金黄色葡萄球菌食物中毒和临床感染提供基础数据及参考。方法 采用 VITEK 2 Compact全自动细菌鉴定仪、GPI鉴定卡及AST-GP67进行药敏试验,聚合酶链式反应(PCR)法进行mecA基因检测。结果 325株金黄色葡萄球菌分离株耐药率为92.00%(299/325),前3位的分别是青霉素G(88.00%,286/325)、四环素(43.38%,141/325)、红霉素(40.92%,133/325),未检出耐喹奴普汀/达福普汀、万古霉素、力奈唑烷和替加环素的耐药株;MDR菌株检出率为47.69%(155/325),MRSA检出率为13.23%(43/325)。不同食品对青霉素G、四环素和呋喃妥因的耐药率差异有统计学意义(P<0.05);餐饮食品、肉与肉制品、速冻米面制品中均检出九重耐药菌株;MRSA在水产品中占33.33%(1/3),肉与肉制品占17.89%(17/95),焙烤食品占16.67%(3/18),乳与乳制品占14.29%(3/21),餐饮食品占12.41%(17/137),速冻米面制品占5.71%(2/35),差异均无统计学意义(P>0.05),婴幼儿食品、冷冻饮品和豆制品未检出MRSA。不同年份分离株对环丙沙星、莫西沙星和复方磺胺甲噁唑的耐药率差异有统计学意义(P<0.05),2012—2015年均检出九重耐药株;2015年MRSA占比为20.00%(12/60),2014年占16.47%(14/85),2013年占14.12%(12/85),2012年占6.82%(3/44),2011年占10.00%(2/20),2010和2016年未检出MRSA。43株MRSA药敏试验显示耐药率最高的主要为青霉素G(100.00%,43/43),呈多重耐药性,未检出耐万古霉素的MRSA,mecA基因的检出率为37.21%(16/43)。结论 食品中金黄色葡萄球菌的分布、抗生素耐药变化和发展趋势值得关注,有利于食源性疾病防治和指导临床合理选用抗生素,延缓细菌耐药株的产生。

    Abstract:

    Objective To investigate antimicrobial sensitivity of Staphylococcus aureus strains isolated from various food products in Yunnan Province during 2010-2016, in which, distributions of the multidrug-resistant (MDR) strains and the methicillin-resistant Staphylococcus aureus (MRSA) strains, and the carrier rates of mecA gene were determined for further epidemic control. Methods Antimicrobial sensitivity of the strains was detected by VITEK 2 Compact system with GPI and AST-GP67 cards. Polymerase chain reaction (PCR) with specific primers was used for detection of mecA gene. Results About 92.00%(299/325) of total 325 strains of Staphylococcus aureus were identified drug resistance, and the top three resistance were 88.00%(286/325) for benzylpenicillin, 43.38%(141/325) for tetracycline and 40.92%(133/325) for erythromycin. No strain showed resistant to quinupristin/dalfopristin, vancomycin, linezolid and tigecycline. The strains with MDR and MRSA were accounted for 47.69%(155/325) and 13.23%(43/325) respectively. Significant difference was observed in strains from different food products showing resistant to benzylpenicillin, tetracycline and nitrofurantoin(P< 0.05). The strain with 9 drug-resistant was detected in cooked food, fast-frozen food and meat or meat-products. The strains with MRSA were found in aquatic-products with positive rate of 33.33%(1/3), in meat or meat-products with positive rate of 17.89%(17/95), in baked food with positive rate of 16.67%(3/18), in milk or dairy products with positive rate of 14.29%(3/21), in cooked food with positive rate of 12.41%(17/137), in fast-frozen food with positive rate of 5.71%(2/35). No positive detection was found in infant food, frozen drinks and soy products(P>0.05). Significant difference was found in resistant rate to ciprofloxacin, moxifloxacin, trimethoprim/sulfamethoxazole during 2010-2016 (P<0.05). Some strains isolated in 2012-2015 were identified with 9 drug-resistant. Positive rate of MRSA during 2010 to 2016 was respectively 0.00%(0/15), 10.00%(2/20), 6.82%(3/44), 14.12%(12/85), 16.47%(14/85), 20.00%(12/60) and 0.00%(0/0). In strains with MRSA, 43 were resistant to benzylpenicillin(100.00%,43/43). However, no strain with MRSA was resistant to vanconycin. The carrier rate of mecA gene in all strains was 37.21%(16/43). Conclusion The tendency of antibiotics resistance evolved in Staphylococcus aureus in popular food should be concerned,which would be beneficial to prevent foodborne disease and guide the rational clinical practice for Staphylococcus aureus.

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杨庆文,国译丹,汤晓召,杨祖顺,邹颜秋硕.云南省食品中金黄色葡萄球菌耐药性和mecA基因的检测及分析[J].中国食品卫生杂志,2018,30(5):462-467.

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  • 收稿日期:2018-07-27
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  • 在线发布日期: 2018-09-29
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