Prevalence and characterization of Escherichia coli O157:H7 from samples along the production line in Chinese beef-processing plants

Dong, Pengcheng; Zhu, Lixian; Mao, Yanwei; Liang, Rongrong; Niu, Lebao; Zhang, Yimin; Luo, Xin

doi:10.1016/j.foodcont.2015.01.038

Cited by 12 publications

(7 citation statements)

References 33 publications

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“…Similarly, the prevalence of AMR E. coli O157:H7 was investigated in 510 fecal, hide, carcass, and raw meat samples from 4 beef slaughterhouses in China. STEC was detected in 1.4% of fecal and hide sample, but not in pre- and post-evisceration carcasses, nor in raw meat samples, with all isolates sensitive to 16 relevant antimicrobials [132]. During slaughter, cattle hides are major contributors to carcass contamination [133, 134].…”

Section: Antmicrobial Resistance In Zoonotic Human Enteropathogensmentioning

confidence: 99%

Antimicrobial usage and resistance in beef production

Cameron

McAllister

2016

J Animal Sci Biotechnol

138

122

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Antimicrobials are critical to contemporary high-intensity beef production. Many different antimicrobials are approved for beef cattle, and are used judiciously for animal welfare, and controversially, to promote growth and feed efficiency. Antimicrobial administration provides a powerful selective pressure that acts on the microbial community, selecting for resistance gene determinants and antimicrobial-resistant bacteria resident in the bovine flora. The bovine microbiota includes many harmless bacteria, but also opportunistic pathogens that may acquire and propagate resistance genes within the microbial community via horizontal gene transfer. Antimicrobial-resistant bovine pathogens can also complicate the prevention and treatment of infectious diseases in beef feedlots, threatening the efficiency of the beef production system. Likewise, the transmission of antimicrobial resistance genes to bovine-associated human pathogens is a potential public health concern. This review outlines current antimicrobial use practices pertaining to beef production, and explores the frequency of antimicrobial resistance in major bovine pathogens. The effect of antimicrobials on the composition of the bovine microbiota is examined, as are the effects on the beef production resistome. Antimicrobial resistance is further explored within the context of the wider beef production continuum, with emphasis on antimicrobial resistance genes in the food chain, and risk to the human population.

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Section: Antmicrobial Resistance In Zoonotic Human Enteropathogensmentioning

confidence: 99%

Antimicrobial usage and resistance in beef production

Cameron

McAllister

2016

J Animal Sci Biotechnol

138

122

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“…E. coli can form biofilms on biological or abiotic surfaces, thereby enhancing its survival rate in adverse environments, especially increasing the resistance to various antibiotics, disinfectants, and detergents. 17 In the studied series of amphiphilic cationic polymers, mPB 35 /T 57 has been proved to have the highest antibacterial activity. To understand whether this optimal hydrophilic−hydrophobic balance of mPB 35 /T 57 in bacterial inhibition also facilitates biofilm removing, we evaluated the anti-E. coli biofilm activity of mPB 35 /T 57 by comparing with the other two copolymers (mPB 11 /T 82 and mPB 77 /T 11 in series V of Table 1), which had different hydrophilic/ hydrophobic segment ratios but similar DP values with mPB 35 /T 57 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…8−10 Therefore, an increasing number of approaches for removing biofilm have been studied based on a variety of biofilm models, including Gram-positive bacteria such as S. aureus 11,12 and MRSA, 13,14 S. mutans, 15,16 and Gram-negative bacteria such as P. aeruginosa 10 and E. coli. 17 To develop novel effective antimicrobial agents, besides the ability to treat the drugresistant bacterial infections without inducing new drug resistance, 18 the agents need to have the ability prevent biofilm formation and destroy biofilms already formed. To satisfy these needs, multitudinous polymer-based antimicrobial agents have been prepared, showing the potential to solve the global clinical problem.…”

Section: ■ Introductionmentioning

confidence: 99%

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Screening and Matching Amphiphilic Cationic Polymers for Efficient Antibiosis

et al. 2020

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The amphiphilic cationic polymers that mimic antimicrobial peptides have received increasing attention due to their excellent antibacterial activity. However, the relationship between the structure of cationic polymers and its antibacterial effect remains unclear. In our current work, a series of PEG blocked amphiphilic cationic polymers composed of hydrophobic alkyl-modified and quaternary ammonium salt (QAS) moieties have been prepared. The structure–antibacterial activity relationship of these cationic polymers was investigated against E. coli and S. aureus, including PEGylation, random structure, molecular weights, and the content and lengths of the hydrophobic alkyl side chains. The results indicated that PEGylated random amphiphilic cationic copolymer (mPB35/T57) showed stronger antibacterial activity and better biocompatibility than the random copolymer without PEG (PB33/T56). Furthermore, mPB35/T57 with appropriate mole fraction of alkyl side chains (f alkyl = 0.38), degree of polymerization (DP = 92), and four-carbon hydrophobic alkyl moieties was found to have the optimal structure that revealed the best antibacterial activities against both E. coli (MIC = 8 μg/mL, selectivity > 250) and S. aureus (MIC = 4 μg/mL, selectivity > 500). More importantly, mPB35/T57 could effectively eradicate E. coli biofilms by killing the bacteria embedded in the biofilms. Therefore, the structure of mPB35/T57 provided valuable information for improving the antibacterial activity of cationic polymers.

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“…The biofilm is formed on a solid surface with appropriate characteristics to favor the attachment process ( Annous et al, 2009 ). As mentioned, roughness is a surface property that favors the microbial colonization expansion due to the larger surface area, which acts as an anchor for the already attached bacteria ( Dong et al, 2015 ). The hydrophobic surfaces used in the food industry (e.g., plastics, Teflon, polystyrene, and polyethylene) favored the microbial community adherence because of the hydrophobic interactions between the surface and bacteria ( Adlhart et al, 2018 ).…”

Section: Microbial Contaminationmentioning

confidence: 99%