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Rolon ML, Chandross-Cohen T, Kaylegian KE, Roberts RF, Kovac J. Context matters: environmental microbiota from ice cream processing facilities affected the inhibitory performance of two lactic acid bacteria strains against Listeria monocytogenes. Microbiol Spectr 2024; 12:e0116723. [PMID: 38038456 PMCID: PMC10783139 DOI: 10.1128/spectrum.01167-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023] Open
Abstract
IMPORTANCE Antilisterial LAB strains have been proposed as biological control agents for application in food processing environments. However, the effect of resident food processing environment microbiota on the performance on antilisterial LAB strains is poorly understood. Our study shows that the presence of microbiota collected from ice cream processing facilities' environmental surfaces can affect the attachment and inhibitory effect of LAB strains against L. monocytogenes. Further studies are therefore needed to assess whether individual microbial taxa affect antilisterial properties of LAB strains and to characterize the underlying mechanisms.
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Affiliation(s)
- M. Laura Rolon
- Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania, USA
- One Health Microbiome Center, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Tyler Chandross-Cohen
- Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Kerry E. Kaylegian
- Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Robert F. Roberts
- Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Jasna Kovac
- Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania, USA
- One Health Microbiome Center, The Pennsylvania State University, University Park, Pennsylvania, USA
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2
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Singh D, Anand S. Efficacy of a typical clean-in-place protocol against in vitro membrane biofilms. J Dairy Sci 2022; 105:9417-9425. [DOI: 10.3168/jds.2022-21712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 07/22/2022] [Indexed: 11/07/2022]
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3
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Lindsay D, Killington A, Fouhy K, Loh M, Malakar P. The CDC biofilm bioreactor is a suitable method to grow biofilms, and test their sanitiser susceptibilities, in the dairy context. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2021.105264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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4
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Distribution and molecular characterization of ESBL, pAmpC β-lactamases, and non-β-lactam encoding genes in Enterobacteriaceae isolated from hospital wastewater in Eastern Cape Province, South Africa. PLoS One 2021; 16:e0254753. [PMID: 34288945 PMCID: PMC8294522 DOI: 10.1371/journal.pone.0254753] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 07/02/2021] [Indexed: 11/30/2022] Open
Abstract
Globally, there is an increasing occurrence of multidrug-resistant (MDR) Enterobacteriaceae with extended-spectrum β-lactamases (ESBLs) and/or plasmid-encoded AmpC (pAmpC) β-lactamases in clinical and environmental settings of significant concern. Therefore, we aimed to evaluate the occurrence of ESBL/pAmpC genetic determinants, and some essential non-β-lactam genetic determinants in the MDR phenotypic antimicrobial resistance in Enterobacteriaceae isolates recovered from hospital wastewater. We collected samples from two hospitals in Amathole and Chris Hani District Municipalities in the Eastern Cape Province, South Africa, within October and November 2017. Using the matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF), we identified a total of 44 presumptive Enterobacteriaceae isolates. From this, 31 were identified as the targeted Enterobacteriaceae members. Thirty-six percent of these belonged to Klebsiella oxytoca, while 29% were Klebsiella pneumoniae. The other identified isolates included Citrobacter freundii and Escherichia coli (10%), Enterobacter asburiae (6%), Enterobacter amnigenus, Enterobacter hormaechei, and Enterobacter kobei (3%). We established the antibiotic susceptibility profiles of these identified bacterial isolates against a panel of 18 selected antibiotics belonging to 11 classes were established following established guidelines by the Clinical and Laboratory Standard Institute. All the bacterial species exhibited resistance phenotypically against at least four antibiotic classes and were classified as MDR. Notably, all the bacterial species displayed resistance against cefotaxime, ampicillin, nalidixic acid, and trimethoprim-sulfamethoxazole. The generated multiple antibiotic resistance indices ranged between 0.5 to 1.0, with the highest value seen in one K. oxytoca isolated. Molecular characterization via the Polymerase Chain Reaction uncovered various ESBLs, pAmpCs, and other non-β-lactam encoding genes. Of the phenotypically resistant isolates screened for each class of antibiotics, the ESBLs detected were blaCTX-M group (including groups 1, 2, and 9) [51.6% (16/31)], blaTEM [32.3% (10/31)], blaOXA-1-like [19.4% (6/31)], blaSHV [12.9% (4/31)], blaPER [6.5% (2/31)], blaVEB [3.2% (1/31)], blaOXA-48-like and blaVIM [15.4% (2/13)], and blaIMP [7.7% (1/13)]. The pAmpC resistance determinants detected were blaCIT [12.9% (4/31)], blaFOX [9.7% (3/31)], blaEBC [6.5% (2/31)], and blaDHA [3.2% (1/31)]. The frequencies of the non-β-lactam genes detected were catII [79.2% (19/24)], tetA [46.7% (14/30)], sulI and sulII [35.5% (11/31)], tetB [23.3% (7/30)], aadA [12.9% (4/31)], tetC [10% (3/30)], and tetD [3.3% (1/30)]. These results indicate that hospital wastewater is laden with potentially pathogenic MDR Enterobacteriaceae with various antibiotic resistance genes that can be spread to humans throughout the food chain, provided the wastewaters are not properly treated before eventual discharge into the environment.
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Villeneuve W, Bérubé A, Chamberland J, Pouliot Y, Labrie S, Doyen A. Contribution of biofouling to permeation flux decline and membrane resistance changes during whey ultrafiltration. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2021.105010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Chen X, Hu Y, Tian S, Han B. Understanding the Interactions between Staphylococcus aureus and the Raw-Meat-Processing Environment Isolate Klebsiella oxytoca in Dual-Species Biofilms via Discovering an Altered Metabolic Profile. Microorganisms 2021; 9:microorganisms9040672. [PMID: 33805148 PMCID: PMC8064066 DOI: 10.3390/microorganisms9040672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/02/2021] [Accepted: 03/23/2021] [Indexed: 11/24/2022] Open
Abstract
In a raw-meat-processing environment, members of the Enterobacteriaceae family can coexist with Staphylococcus aureus to form dual-species biofilms, leading to a higher risk of food contamination. However, very little is known about the effect of inter-species interactions on dual-species biofilm formation. The aim of this study was to investigate the interactions between S. aureus and raw-meat-processing environment isolates of Klebsiella oxytoca in dual-species biofilms, by employing an untargeted metabolomics tool. Crystal violet staining assay showed that the biomass of the dual-species biofilm significantly increased and reached its maximum after incubation for 21 h, compared with that of single species grown alone. The number of K. oxytoca in the dual-species biofilm was significantly higher than that of S. aureus. Field emission scanning electron microscopy (FESEM) revealed that both species were evenly distributed, and were tightly wrapped by extracellular polymeric substances in the dual-species biofilms. Ultra-high-pressure liquid chromatography equipped with a quadrupole-time-of-flight mass spectrometer (UHPLC-Q-TOF MS) analysis exhibited a total of 8184 positive ions, and 6294 negative ions were obtained from all test samples. Multivariate data analysis further described altered metabolic profiling between mono- and dual-species biofilms. Further, 18 and 21 different metabolites in the dual-species biofilm were screened as biomarkers by comparing the mono-species biofilms of S. aureus and K. oxytoca, respectively. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways that were exclusively upregulated in the dual-species biofilm included ABC transporters, amino acid metabolism, and the two-component signal transduction system. Our results contribute to a better understanding of the interactive behavior of inter-species biofilm communities, by discovering altered metabolic profiling.
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Rossi C, Chaves-López C, Serio A, Casaccia M, Maggio F, Paparella A. Effectiveness and mechanisms of essential oils for biofilm control on food-contact surfaces: An updated review. Crit Rev Food Sci Nutr 2020; 62:2172-2191. [PMID: 33249878 DOI: 10.1080/10408398.2020.1851169] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Microbial biofilms represent a constant source of contamination in the food industry, being also a real threat for human health. In fact, most of biofilm-producing bacteria are becoming resistant to sanitizers, thus arousing the interest in natural alternatives to prevent biofilm formation on foods and food-contact surfaces. In particular, studies on biofilm control by essential oils (EOs) application are increasing, being EOs characterized by unique mixtures of compounds able to impair the mechanisms of biofilm development. This review reports the anti-biofilm properties of EOs in bacterial biofilm control (inhibition, removal and prevention of biofilm dispersion) on food-contact surfaces. The relationship between EOs effect and composition, concentration, involved bacteria, and surfaces is discussed, and the possible sites of action are also elucidated. The findings prove the high biofilm controlling capability of EOs through the regulation of genes and proteins implicated in motility, Quorum Sensing and exopolysaccharides (EPS) matrix. Moreover, incorporation in nanosized delivery systems, formulation of blends and combination of EOs with other strategies can increase their anti-biofilm activity. This review provides an overview of the current knowledge of the EOs effectiveness in controlling bacterial biofilm on food-contact surfaces, providing valuable information for improving EOs use as sanitizers in food industries.
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Affiliation(s)
- Chiara Rossi
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
| | - Clemencia Chaves-López
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
| | - Annalisa Serio
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
| | - Manila Casaccia
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
| | - Francesca Maggio
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
| | - Antonello Paparella
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, TE, Italy
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King TLB, Schmidt S, Essack SY. Antibiotic resistant Klebsiella spp. from a hospital, hospital effluents and wastewater treatment plants in the uMgungundlovu District, KwaZulu-Natal, South Africa. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 712:135550. [PMID: 31818599 DOI: 10.1016/j.scitotenv.2019.135550] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 11/08/2019] [Accepted: 11/14/2019] [Indexed: 05/22/2023]
Abstract
Hospital effluents are crucial hotspots for the dissemination of antibiotic resistant microorganisms. This study analysed hospital effluent and proximate wastewater treatment plants for the presence of antibiotic resistant Klebsiella spp. Water samples were obtained twice over a three-month period from an urban and rural hospital at three effluent points each, and from two proximate wastewater treatment plants (WWTPs) comprising influent and effluent and river water samples up/downstream the WWTPs. Presumptive Klebsiella spp. were enumerated, isolated, and phenotypically confirmed using a well-established commercial test system for Enterobacteriaceae (API20E). Clinical Klebsiella pneumoniae isolates were provided by a hospital for comparison. The antibiotic resistance profiles of Klebsiella spp. isolates to 16 selected antibiotics were established according to EUCAST (European Committee on Antimicrobial Susceptibility Testing). In addition, extended spectrum β-lactamase (ESBL) and carbapenemase production was analysed. A total of 93 confirmed Klebsiella spp. isolates from hospital effluents and 37 from WWTPs were obtained, comprising K. pneumoniae and K. oxytoca. The viable counts for confirmed Klebsiella spp. for hospital effluents ranged from 1.38 × 102 to 1.03 × 104, while those for WWTP influent were in a range of 1.76 × 103 to 5.10 × 103 CFU/ml. A higher proportion of Klebsiella spp. from urban hospital effluent was categorized as multidrug-resistant (MDR) (23%) compared to rural hospital effluent (9%). Resistance was observed to all antibiotic classes tested. Several clinical isolates presented resistance to four carbapenem antibiotics, while certain isolates from hospital effluent and WWTPs exhibited ertapenem and doripenem resistance. Fifteen Klebsiella spp. isolates (clinical and from urban hospital effluent) produced carbapenemases. Hospital effluents in South Africa contain antibiotic resistant Klebsiella spp. and may pose a risk to proximate informal communities if inadequately treated. Moreover, common phenotypic resistance profiles among isolates from the clinical-hospital effluent-wastewater works continuum suggest a need for further treatment of such effluent.
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Affiliation(s)
- Tracy L B King
- Discipline of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Pietermaritzburg 3209, South Africa; Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
| | - Stefan Schmidt
- Discipline of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Pietermaritzburg 3209, South Africa.
| | - Sabiha Y Essack
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
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10
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Gupta TB, Mowat E, Brightwell G, Flint SH. Biofilm formation and genetic characterization of New Zealand Cronobacter
isolates. J Food Saf 2017. [DOI: 10.1111/jfs.12430] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Tanushree B. Gupta
- Hopkirk Research Institute; Food and Bio-Based Products, AgResearch Limited; Palmerston North New Zealand
| | - Eilidh Mowat
- Plant Physiology Team, Hill Laboratories; Hamilton New Zealand
| | - Gale Brightwell
- Hopkirk Research Institute; Food and Bio-Based Products, AgResearch Limited; Palmerston North New Zealand
| | - Steve H. Flint
- Massey Institute of Food Science and Technology, Massey University; Palmerston North New Zealand
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11
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Chamberland J, Beaulieu-Carbonneau G, Lessard MH, Labrie S, Bazinet L, Doyen A, Pouliot Y. Effect of membrane material chemistry and properties on biofouling susceptibility during milk and cheese whey ultrafiltration. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.08.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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12
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Alhariri M, Majrashi MA, Bahkali AH, Almajed FS, Azghani AO, Khiyami MA, Alyamani EJ, Aljohani SM, Halwani MA. Efficacy of neutral and negatively charged liposome-loaded gentamicin on planktonic bacteria and biofilm communities. Int J Nanomedicine 2017; 12:6949-6961. [PMID: 29075113 PMCID: PMC5609801 DOI: 10.2147/ijn.s141709] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
We investigated the efficacy of liposomal gentamicin formulations of different surface charges against Pseudomonas aeruginosa and Klebsiella oxytoca. The liposomal gentamicin formulations were prepared by the dehydration-rehydration method, and their sizes and zeta potential were measured. Gentamicin encapsulation efficiency inside the liposomal formulations was determined by microbiologic assay, and stability of the formulations in biologic fluid was evaluated for a period of 48 h. The minimum inhibitory concentration and the minimum bactericidal concentration were determined, and the in vitro time kill studies of the free form of gentamicin and liposomal gentamicin formulations were performed. The activities of liposomal gentamicin in preventing and reducing biofilm-forming P. aeruginosa and K. oxytoca were compared to those of free antibiotic. The sizes of the liposomal formulations ranged from 625 to 806.6 nm in diameter, with the zeta potential ranging from -0.22 to -31.7 mV. Gentamicin encapsulation efficiency inside the liposomal formulation ranged from 1.8% to 43.6%. The liposomes retained >60% of their gentamicin content during the 48 h time period. The minimum inhibitory concentration of neutral formulation was lower than that of free gentamicin (0.25 versus 1 mg/L for P. aeruginosa and 0.5 versus 1 mg/L for K. oxytoca). The negatively charged formulation exhibited the same bacteriostatic concentration as that of free gentamicin. The minimum bactericidal concentration of neutral liposomes on planktonic bacterial culture was twofold lower than that of free gentamicin, whereas the negatively charged formulations were comparable to free gentamicin. The killing time curve values for the neutral negatively charged formulation against planktonic P. aeruginosa and K. oxytoca were better than those of free gentamicin. Furthermore, liposomal formulations prevent the biofilm-formation ability of these strains better than free gentamicin. In summary, liposomal formulations could be an effective lipid nanoparticle to combat acute infections where planktonic bacteria are predominant.
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Affiliation(s)
- Moayad Alhariri
- Nanomedicine Department, King Abdullah International Medical Research Center (KAIMRC), King Saud bin Abdulaziz University for Health Sciences
| | - Majed A Majrashi
- National Centre for Biotechnology, Life Sciences and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST)
| | - Ali H Bahkali
- Botany and Microbiology Department, College of Science, King Saud University
| | - Faisal S Almajed
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
| | - Ali O Azghani
- Department of Biology, The University of Texas at Tyler, Tyler, TX, USA
| | - Mohammad A Khiyami
- National Centre for Biotechnology, Life Sciences and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST)
| | - Essam J Alyamani
- National Centre for Biotechnology, Life Sciences and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST)
| | - Sameera M Aljohani
- College of Science and Health Professions, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
| | - Majed A Halwani
- Nanomedicine Department, King Abdullah International Medical Research Center (KAIMRC), King Saud bin Abdulaziz University for Health Sciences
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Sanders D, Borys KD, Kisa F, Rakowski SA, Lozano M, Filutowicz M. Multiple Dictyostelid Species Destroy Biofilms of Klebsiella oxytoca and Other Gram Negative Species. Protist 2017; 168:311-325. [PMID: 28499132 DOI: 10.1016/j.protis.2017.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/29/2017] [Accepted: 04/03/2017] [Indexed: 12/17/2022]
Abstract
Dictyostelids are free-living phagocytes that feed on bacteria in diverse habitats. When bacterial prey is in short supply or depleted, they undergo multicellular development culminating in the formation of dormant spores. In this work, we tested isolates representing four dictyostelid species from two genera (Dictyostelium and Polysphondylium) for the potential to feed on biofilms preformed on glass and polycarbonate surfaces. The abilities of dictyostelids were monitored for three hallmarks of activity: 1) spore germination on biofilms, 2) predation on biofilm enmeshed bacteria by phagocytic cells and 3) characteristic stages of multicellular development (streaming and fructification). We found that all dictyostelid isolates tested could feed on biofilm enmeshed bacteria produced by human and plant pathogens: Klebsiella oxytoca, Pseudomonas aeruginosa, Pseudomonas syringae, Erwinia amylovora 1189 (biofilm former) and E. amylovora 1189 Δams (biofilm deficient mutant). However, when dictyostelids were fed planktonic E. amylovora Δams the bacterial cells exhibited an increased susceptibility to predation by one of the two dictyostelid strains they were tested against. Taken together, the qualitative and quantitative data presented here suggest that dictyostelids have preferences in bacterial prey which affects their efficiency of feeding on bacterial biofilms.
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Affiliation(s)
- Dean Sanders
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA
| | - Katarzyna D Borys
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA
| | - Fikrullah Kisa
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA
| | - Sheryl A Rakowski
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA
| | - Marcela Lozano
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA
| | - Marcin Filutowicz
- Department of Bacteriology, University of Wisconsin-Madison 1550 Linden Dr., Madison, WI 53706, USA.
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Md Zain SN, Bennett R, Flint S. The Potential Source ofB. licheniformisContamination During Whey Protein Concentrate 80 Manufacture. J Food Sci 2017; 82:751-756. [DOI: 10.1111/1750-3841.13633] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 12/28/2016] [Indexed: 11/28/2022]
Affiliation(s)
- Siti Norbaizura Md Zain
- Massey Inst. of Food Science and Technology; Massey Univ.; Private Bag 11 222 Palmerston North New Zealand
- Applied Science Faculty; UiTM Negeri Sembilan; Kuala Pilah campus, 72000 Kuala pilah Negeri Sembilan Malaysia
| | - Rod Bennett
- Massey Inst. of Food Science and Technology; Massey Univ.; Private Bag 11 222 Palmerston North New Zealand
| | - Steve Flint
- Massey Inst. of Food Science and Technology; Massey Univ.; Private Bag 11 222 Palmerston North New Zealand
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Masiello S, Martin N, Trmčić A, Wiedmann M, Boor K. Identification and characterization of psychrotolerant coliform bacteria isolated from pasteurized fluid milk. J Dairy Sci 2016; 99:130-40. [DOI: 10.3168/jds.2015-9728] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 09/14/2015] [Indexed: 11/19/2022]
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16
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Chai Z, Wang J, Tao S, Mou H. Application of bacteriophage-borne enzyme combined with chlorine dioxide on controlling bacterial biofilm. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2014.06.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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17
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Srey S, Park SY, Jahid IK, Oh SR, Han N, Zhang CY, Kim SH, Cho JI, Ha SD. Evaluation of the removal and destruction effect of a chlorine and thiamine dilaurylsulfate combined treatment on L. monocytogenes biofilm. Foodborne Pathog Dis 2014; 11:658-63. [PMID: 24971770 DOI: 10.1089/fpd.2013.1734] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The present study investigated the efficacy of single and combined treatment of both chlorine and thiamine dilaurylsulfate (TDS) on the reduction of Listeria monocytogenes biofilms in microtiter plate. The disinfectants used in this study were 50, 100, and 200 mg/L chlorine and 100, 500, and 1000 mg/L of TDS. Biofilm-forming index (BFI) and culturable cell count were used to evaluate the disinfectant assay. The highest BFI reduction was 0.80, achieved by the combination of 200 mg/L chlorine and 1000 mg/L TDS. In contrast, the highest culturable cell count reduction was 4.80 log colony-forming units/well by the combination of 200 mg/L chlorine and 100 mg/L TDS. The BFI was reduced in a concentration-dependent manner while culturable cell count was significantly reduced only when all chlorine concentration was combined with 100 mg/L TDS. However, when chlorine was combined with a higher concentration of TDS, the reduction decreased significantly. The result in this study showed that the combination of the 200 mg/L chlorine and 1000 mg/L TDS could be a practical application in removing L. monocytogenes biofilms from surfaces in food industry, and for the 200 mg/L chlorine and 100 mg/L, it can be used for killing the pathogen biofilms. However, more studies are still needed in order to show its efficacy on foods surfaces as well as to develop an even more effective treatment in both killing and removing biofilms.
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Affiliation(s)
- Sokunrotanak Srey
- 1 School of Food Science and Technology, Chung-Ang University , Anseong-si, Gyeonggi-do, South Korea
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Lowe C, Willey B, O'Shaughnessy A, Lee W, Lum M, Pike K, Larocque C, Dedier H, Dales L, Moore C, McGeer A. Outbreak of extended-spectrum β-lactamase-producing Klebsiella oxytoca infections associated with contaminated handwashing sinks(1). Emerg Infect Dis 2013; 18:1242-7. [PMID: 22841005 PMCID: PMC3414015 DOI: 10.3201/eid1808.111268] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Sinks are a potential reservoir for environment-to-patient and patient-to-patient transmission. Klebsiella oxytoca is primarily a health care–associated pathogen acquired from environmental sources. During October 2006–March 2011, a total of 66 patients in a hospital in Toronto, Ontario, Canada, acquired class A extended-spectrum β-lactamase–producing K. oxytoca with 1 of 2 related pulsed-field gel electrophoresis patterns. New cases continued to occur despite reinforcement of infection control practices, prevalence screening, and contact precautions for colonized/infected patients. Cultures from handwashing sinks in the intensive care unit yielded K. oxytoca with identical pulsed-field gel electrophoresis patterns to cultures from the clinical cases. No infections occurred after implementation of sink cleaning 3×/day, sink drain modifications, and an antimicrobial stewardship program. In contrast, a cluster of 4 patients infected with K. oxytoca in a geographically distant medical ward without contaminated sinks was contained with implementation of active screening and contact precautions. Sinks should be considered potential reservoirs for clusters of infection caused by K. oxytoca.
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Marchand S, De Block J, De Jonghe V, Coorevits A, Heyndrickx M, Herman L. Biofilm Formation in Milk Production and Processing Environments; Influence on Milk Quality and Safety. Compr Rev Food Sci Food Saf 2012. [DOI: 10.1111/j.1541-4337.2011.00183.x] [Citation(s) in RCA: 202] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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