Thung Tze Y, Radu Son, Mahyudin Nor A, Rukayadi Yaya, Zakaria Zunita, Mazlan Nurzafirah, Tan Boon H, Lee Epeng, Yeoh Soo L, Chin Yih Z, Tan Chia W, Kuan Chee H, Basri Dayang F, Wan Mohamed Radzi Che W J
Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Malaysia.
Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security (ITAFoS), Universiti Putra Malaysia, Serdang, Malaysia.
Front Microbiol. 2018 Jan 11;8:2697. doi: 10.3389/fmicb.2017.02697. eCollection 2017.
The aim of the present study was to investigate the prevalence of spp., Enteritidis and Typhimurium in retail beef from different retail markets of Selangor area, as well as, to assess their pathogenic potential and antimicrobial resistance. A total of 240 retail beef meat samples (chuck = 60; rib = 60; round = 60; sirloin = 60) were randomly collected. The multiplex polymerase chain reaction (mPCR) in combination with the most probable number (MPN) method was employed to detect spp., . Enteritidis and . Typhimurium in the meat samples. The prevalence of spp., . Enteritidis and . Typhimurium in 240 beef meat samples were 7.50, 1.25, and 0.83%, respectively. The microbial loads of total was found in the range of <3 to 15 MPN/g. Eight different serovars of were identified among the 23 isolates, and . Agona was the predominant serovar (26.09%). Interestingly, all the isolates were resistant to penicillin, erythromycin and vancomycin, but the sensitivity was observed for tetracycline, gentamicin and amoxicillin/clavulanic acid. All 23 isolates were resistant to at least three antibiotics. Two . Typhimurium isolates (8.70%) exhibited the highest multiple antibiotic resistance (MAR) index value of 0.56 which shown resistance to nine antibiotics. PCR analysis of virulence genes showed that all isolates (100%) were positive for the gene. Meanwhile, was only identified in . Enteritidis and . Typhimurium. The findings in this study indicate that retail beef products tested were widely contaminated with multi-drug resistant (MDR) and various virulence genes are present among the isolated serovars.
本研究的目的是调查雪兰莪地区不同零售市场的零售牛肉中 spp.、肠炎沙门氏菌和鼠伤寒沙门氏菌的流行情况,并评估它们的致病潜力和抗菌耐药性。总共随机采集了240份零售牛肉样本(肩胛肉 = 60份;肋条肉 = 60份;后腿肉 = 60份;里脊 = 60份)。采用多重聚合酶链反应(mPCR)结合最大可能数(MPN)法检测肉样中的 spp.、肠炎沙门氏菌和鼠伤寒沙门氏菌。240份牛肉样本中 spp.、肠炎沙门氏菌和鼠伤寒沙门氏菌的流行率分别为7.50%、1.25%和0.83%。总微生物负荷在<3至15 MPN/g范围内。在23株分离株中鉴定出8种不同的 血清型,阿哥纳血清型是主要血清型(26.09%)。有趣的是,所有 分离株均对青霉素、红霉素和万古霉素耐药,但对四环素、庆大霉素和阿莫西林/克拉维酸敏感。所有23株分离株至少对三种抗生素耐药。两株鼠伤寒沙门氏菌分离株(8.70%)表现出最高的多重抗生素耐药(MAR)指数值0.56,对九种抗生素耐药。毒力基因的PCR分析表明,所有 分离株(100%) 基因呈阳性。同时, 仅在肠炎沙门氏菌和鼠伤寒沙门氏菌中鉴定到。本研究结果表明,所检测的零售牛肉产品广泛受到多重耐药(MDR) 的污染,并且在分离出的 血清型中存在各种毒力基因。