AIMS:To evaluate the prevalence and antimicrobial resistance of Enterococcus species from chickens and pigs in Beijing and Shandong Province, China. METHODS AND RESULTS:Swab samples were collected from four farms in Beijing and two in Shandong Province in 2009 and tested for Enterococcus. Minimum inhibitory concentrations of antimicrobial agents were determined using broth microdilution or agar screening methods. A total of 453 Enterococcus isolates were recovered, belonging to six different Enterococcus species. All isolates were sensitive to vancomycin. Resistance to tetracycline (92.5%), amikacin (89.4%), erythromycin (72.8%) and rifampin (58.1%), and high-level streptomycin resistance (HLSR, 50.3%) were prevalent, while resistance to penicillins (7.9% to penicillin and 4.2% to ampicillin) was rare. The resistance rates to phenicols (chloramphenicol and florfenicol) and enrofloxacin, and high-level gentamicin resistance (HLGR) were approximately 30%. The vast majority of the Enterococcus isolates were classified as multidrug-resistant organisms. CONCLUSIONS:Resistance of Enterococcus sp. to most antimicrobials was more prevalent in China than in European or other Asian countries. SIGNIFICANCE AND IMPACT OF THE STUDY:Our findings reveal a high level of antimicrobial resistance in Enterococcus isolates from food animals in China and underline the need for prudent use of antibiotics in chicken and pig production to minimize the spread of antibiotic-resistant enterococci.

译文

目的:评估北京和山东省鸡和猪的肠球菌的流行情况和耐药性。
方法与结果:2009年从北京的四个农场和山东的两个农场收集了拭子样本,并进行了肠球菌检测。使用肉汤微量稀释或琼脂筛选方法确定最小抑菌浓度。总共回收了453种肠球菌分离株,属于6种不同的肠球菌。所有分离株均对万古霉素敏感。对四环素(92.5%),丁胺卡那霉素(89.4%),红霉素(72.8%)和利福平(58.1%)以及高水平链霉素耐药性(HLSR,50.3%)的耐药性普遍存在,而对青霉素的耐药性(对青霉素的耐药性为7.9%)和氨苄西林占4.2%)是罕见的。对苯甲酚(氯霉素和氟苯尼考)和恩诺沙星的耐药率以及对庆大霉素的高耐药率(HLGR)约为30%。绝大多数肠球菌分离株被归类为耐多药生物。
结论:肠球菌的抗性与欧洲或其他亚洲国家相比,大多数抗菌药物在中国的流行程度更高。
研究的意义和影响:我们的发现表明,中国食用动物肠球菌分离株具有很高的抗药性,并强调在鸡和猪的生产中需要谨慎使用抗生素,以最大程度地减少对抗生素耐药的肠球菌的传播。

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