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Campos ÁSÁ, Akineden Ö, Fernández-Silva JA, Ramírez-Vásquez NF. Extended-spectrum beta-lactamase-producing Klebsiella pneumoniae and risk factors associated with high total bacterial count in bulk tank milk from dairy farms in Colombia. Braz J Microbiol 2024:10.1007/s42770-024-01396-w. [PMID: 38874745 DOI: 10.1007/s42770-024-01396-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 05/16/2024] [Indexed: 06/15/2024] Open
Abstract
The objective of the study was to evaluate the frequency and genetic characteristics of ESBL-producing Escherichia coli and Klebsiella spp. and the risk factors associated with a high total bacterial count in bulk tank milk samples of dairy farms in three municipalities of the Antioquia Department, Colombia. Fifteen samples were positive for E. coli and Klebsiella spp. Subsequent analysis of the 16 S rRNA gene sequences confirmed these isolates included E. coli (n = 3), K. oxytoca (n = 11), and K. pneumoniae (n = 1). None of the isolates was positive for ESBL identification by phenotypic methods, but the only the isolate of K. pneumoniae was positive for the blaSHV61 gene by sequence analysis. The antibiotic susceptibility evaluation for all Klebsiella spp. isolates identified resistance to fosfomycin (50%; 6/12) and ampicillin (100%; 12/12). While most of the herds maintain adequate hygienic quality, specific risk factors such as having more than 60 milking cows, frequent changes in milkers, milking in paddocks, and using a chlorinated product for pre-dipping have been identified as associated with a high total bacterial count > 100,000 CFU/mL in bulk tank milk. However, certain variables including the milker being the owner of the animals and the proper washing and disinfection of the milking machine contribute to maintain a high level of hygiene and quality in the raw milk stored in the tanks. In conclusion, the frequency of ESBL producers was relatively low, with only K. pneumoniae testing positive for the blaSHV ESBL type. The presence of these bacteria in milk tanks represents a potential risk to public health for consumers of raw milk and its derivatives.
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Affiliation(s)
- Ángela-Sofía Ágredo Campos
- Grupo Centauro, Escuela de Medicina Veterinaria, Facultad de Ciencias Agrarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Ömer Akineden
- Dairy Sciences, Institute of Veterinary Food Science, Justus-Liebig-University Giessen, Ludwigstrasse 21, 35390, Giessen, Germany
| | - Jorge A Fernández-Silva
- Grupo Centauro, Escuela de Medicina Veterinaria, Facultad de Ciencias Agrarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Nicolás F Ramírez-Vásquez
- Grupo Centauro, Escuela de Medicina Veterinaria, Facultad de Ciencias Agrarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
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Yi S, Song H, Kim WH, Lee S, Guk JH, Woo J, Cho S. Dynamics of microbiota and antimicrobial resistance in on-farm dairy processing plants using metagenomic and culture-dependent approaches. Int J Food Microbiol 2024; 417:110704. [PMID: 38640816 DOI: 10.1016/j.ijfoodmicro.2024.110704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 03/22/2024] [Accepted: 04/12/2024] [Indexed: 04/21/2024]
Abstract
On-farm dairy processing plants, which are situated close to farms and larger dairy processing facilities, face unique challenges in maintaining environmental hygiene. This can impact various stages of dairy processing. These plants operate on smaller scales and use Low-Temperature-Long-Time (LTLT) pasteurization, making them more susceptible to microbial contamination through direct and indirect contact. Antimicrobial-resistant bacteria found on dairy farms pose risks to human health by potentially transferring resistance via dairy products. Our study aimed to investigate microbial distribution and antimicrobial resistance at four key stages: the farm, pre-pasteurization, post-pasteurization, and processing environments. We assessed microbial distribution by quantifying indicator bacteria and conducting metagenomic analysis. Antimicrobial resistance was examined by identifying resistance phenotypes and detecting resistance genes in bacterial isolates and metagenomes. Our results showed that the indicator bacteria were detected at all stages of on-farm dairy processing. We observed a significant reduction in aerobic microbes and coliforms post-pasteurization. However, contamination of the final dairy products increased, suggesting potential cross-contamination during post-pasteurization. Metagenomic analysis revealed that Pseudomonas, a representative psychrotrophic bacterium, was predominant in both the farm (24.1 %) and pre-pasteurization (65.9 %) stages, indicating microbial transfer from the farms to the processing plants. Post-pasteurization, Pseudomonas and other psychrotrophs like Acinetobacter and Enterobacteriaceae remained dominant. Core microbiota analysis identified 74 genera in total, including 13 psychrotrophic bacteria, across all stages. Of the 59 strains isolated from these plants, 49 were psychrotrophic. Antimicrobial resistance analysis showed that 74.6 % (44/59) of isolates were resistant to at least one antibiotic, with cefoxitin-, ampicillin-, amoxicillin-, and ticarcillin-resistant bacteria present at all stages. Identical antimicrobial resistance patterns were observed in isolates from serial stages of the same farm and season, suggesting bacterial transmission across stages. Additionally, 27.1 % (16/59) of isolates carried plasmid-mediated resistance genes, which were also detected in the metagenomes of non-isolated samples, indicating potential antimicrobial resistance gene transmission and their presence in uncultured bacteria. These findings reveal the persistence of antimicrobial-resistant psychrotrophic bacteria in on-farm dairy processing plants, which pose potential health risks via dairy consumption. Our study underscores the importance of both culture-dependent and culture-independent methods to fully understand their distribution and impact.
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Affiliation(s)
- Saehah Yi
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Hyokeun Song
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Woo-Hyun Kim
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Soomin Lee
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Jae-Ho Guk
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - JungHa Woo
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Seongbeom Cho
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea.
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Alves JS, de Moura Souza R, Lima Moreira JPD, Gonzalez AGM. Antimicrobial resistance of Enterobacteriaceae and Staphylococcus spp. isolated from raw cow's milk from healthy, clinical and subclinical mastitis udders. Prev Vet Med 2024; 227:106205. [PMID: 38678816 DOI: 10.1016/j.prevetmed.2024.106205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/08/2024] [Accepted: 04/07/2024] [Indexed: 05/01/2024]
Abstract
Mastitis is the most common disease of dairy cattle and can be manifested in clinical and subclinical forms. The overuse of antimicrobials in the treatment and prevention of mastitis favours antimicrobial resistance and milk can be a potential route of dissemination. This study aimed to evaluate the biological quality of bulk tank milk (BTM) and the microbiological quality and signs of mastitis of freshly milked raw milk. In addition, to evaluate antimicrobial resistance in Enterobacteriaceae and Staphylococcus spp. isolated from freshly milked raw milk. None of the farms were within the official Brazilian biological quality limits for BTM. Freshly milked raw milk with signs of clinical (CMM), subclinical (SCMM) and no signs (MFM) of mastitis were detected in 6.67%, 27.62% and 65.71% samples, respectively. Most samples of freshly milked raw milk showed acceptable microbiological quality, when evaluating the indicators total coliforms (78.10%), Escherichia coli (88.57%) and Staphylococcus aureus (100%). Klebsiella oxytoca and S. aureus were the most prevalent microorganisms in SCMM and MFM samples. Antimicrobial resistance and multidrug resistance (MDR) were observed in 65.12% and 13.95% of Enterobacteriaceae and 84.31% and 5.88% of Staphylococcus spp., respectively, isolated from both SCMM and MFM samples. Enterobacteriaceae resistant to third-generation cephalosporin (3GCR) (6.98%) and carbapenems (CRE) (6.98%) and methicillin-resistant S. aureus (MRSA) (4.88%) were observed. Antimicrobial-resistant bacteria can spread resistance genes to previously susceptible bacteria. This is a problem that affects animal, human and environmental health and should be evaluated within the one-health concept.
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Affiliation(s)
- Juliana Souza Alves
- Fluminense Federal University (UFF), Faculty of Pharmacy, Department of Bromatology, Hygiene and Food Microbiology Laboratory, 24241-000, Brazil
| | - Rossiane de Moura Souza
- Agricultural Research Company of the State of Rio de Janeiro (PESAGRO-RIO), State Centre for Research in Animal Health, Biotechnology Laboratory, 24120-191, Brazil
| | - Jessica Pronestino de Lima Moreira
- Fluminense Federal University (UFF), Faculty of Pharmacy, Department of Bromatology, Hygiene and Food Microbiology Laboratory, 24241-000, Brazil
| | - Alice Gonçalves Martins Gonzalez
- Fluminense Federal University (UFF), Faculty of Pharmacy, Department of Bromatology, Hygiene and Food Microbiology Laboratory, 24241-000, Brazil.
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Habib I, Mohteshamuddin K, Mohamed MYI, Lakshmi GB, Abdalla A, Bakhit Ali Alkaabi A. Domestic Pets in the United Arab Emirates as Reservoirs for Antibiotic-Resistant Bacteria: A Comprehensive Analysis of Extended-Spectrum Beta-Lactamase Producing Escherichia coli Prevalence and Risk Factors. Animals (Basel) 2023; 13:ani13101587. [PMID: 37238016 DOI: 10.3390/ani13101587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/04/2023] [Accepted: 05/08/2023] [Indexed: 05/28/2023] Open
Abstract
Extended-spectrum β-lactamases resistant (ESBL-R) Escherichia coli (E. coli) has been reported from healthy and sick pets. However, data from Middle Eastern countries, including the United Arab Emirates (UAE), are minimal. This study provides the first evidence of ESBL-R E. coli carriage among pets in the UAE. A total of 148 rectal swabs were collected from domestic cats (n = 122) and dogs (n = 26) attending five animal clinics in the UAE. Samples were cultured directly onto selective agar, and suspected colonies were confirmed as ESBL-producing using phenotypic and molecular methods. Confirmed isolates were screened for their phenotypic resistance to twelve antimicrobial agents using the Kirby Bauer method. The owners of the pets completed a questionnaire at the time of sampling, and the data were used to identify risk factors. ESBL-R E. coli was detected in rectal swabs of 35 out of 148 animals (23.65%) (95% confidence interval [CI]: 17.06-31.32). Multivariable logistic regression analysis identified cats and dogs with access to water in ditches and puddles as 3.71 (p-value = 0.020) times more likely to be positive to ESBL-R E. coli than those without access to open water sources. Ciprofloxacin resistance was evident in 57.14% (44/77) of the ESBL-R E. coli isolates. The percentage of resistance to azithromycin and cefepime was 12.99% (10/77) and 48.05% (37/77), respectively. The blaCTX-M gene was detected in 82% of the PCR-screened isolates (n = 50). Multidrug resistance (MDR) phenotypes were evident in 91% (70/77) of the isolates. In conclusion, ESBL-R E. coli was detected at a noticeable rate among healthy pet cats and dogs in the UAE, and the majority are MDR to clinically important antimicrobials such as fluoroquinolones and 3rd and 4th generation cephalosporins. Our results call for strengthening antimicrobial stewardship among companion animal veterinarians in the UAE to reduce the potential transmission of ESBL-R E. coli between pets, humans, and urban environments.
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Affiliation(s)
- Ihab Habib
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
- Department of Environmental Health, High Institute of Public Health, Alexandria University, Alexandria 5424041, Egypt
| | - Khaja Mohteshamuddin
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
| | - Mohamed-Yousif Ibrahim Mohamed
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
| | - Glindya Bhagya Lakshmi
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
| | - Afra Abdalla
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
| | - Abdulla Bakhit Ali Alkaabi
- Veterinary Public Health Research Laboratory, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab of Emirates University, Abu Dhabi 15551, United Arab Emirates
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Habib I, Elbediwi M, Mohamed MYI, Ghazawi A, Abdalla A, Khalifa HO, Khan M. Enumeration, antimicrobial resistance and genomic characterization of extended-spectrum β-lactamases producing Escherichia coli from supermarket chicken meat in the United Arab Emirates. Int J Food Microbiol 2023; 398:110224. [PMID: 37167788 DOI: 10.1016/j.ijfoodmicro.2023.110224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 05/13/2023]
Abstract
The occurrence and counts of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli in retail chicken sold in the United Arab Emirates (UAE) were investigated in this study. Results indicated that 79.68 % of chicken carcasses (251/315) sampled from UAE supermarkets harbored ESBL-producing E. coli. About half (51.75 % [163/315]) of the tested samples had an ESBL-producing E. coli count range between ≥3 log10 and < 5 log10 CFU/g. The antimicrobial resistance profiles of a subset of 100 isolates showed high rates of non-susceptibility to clinically significant antibiotics, particularly ciprofloxacin (80 %) and cefepime (46 %). Moreover, 7 % of the isolates exhibited resistance to colistin, with PCR-based screening revealing the presence of the mcr-1 gene in all colistin-resistant isolates. Multiplex PCR screening identified blaCTX-M and blaTEM genes as the most frequently presented genes among the phenotypically confirmed ESBL-producing E. coli. Further whole-genome sequencing and bioinformatic analysis of 27 ESBL-producing E. coli isolates showed that the gene family blaCTX group 1 was the most prevalent, notably CTX-M-55 (55.55 % [15/27]), followed by CTX-M-15 (22.22 % [6/27]). The most common sequence types (STs) were ST359 and ST1011, with three evident clusters identified based on phylogenomic analysis, aligned with isolates from specific production companies. Analysis of plasmid incompatibility types revealed IncFIB, IncFII, Incl2, and IncX1 as the most commonly featured plasmids. The findings of this study indicate a noticeable prevalence and high counts of ESBL-producing E. coli in chicken sampled from supermarkets in the UAE. The high rates of antimicrobial resistance to clinically important antibiotics highlight the potential public health risk associated with consuming chicken contaminated with ESBL-producing E. coli. Overall, this study emphasizes the importance of continued antimicrobial resistance monitoring in the UAE food chain and calls for further exposure risk assessment of the consumption of ESBL-producing E. coli via chicken meat.
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Affiliation(s)
- Ihab Habib
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates; Department of Environmental Health, High Institute of Public Health, Alexandria University, Alexandria, Egypt; ASPIRE Research Institute for Food Security in the Drylands (ARIFSID), United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates.
| | - Mohammed Elbediwi
- Evolutionary Biology, Institute for Biology, Freie Universität Berlin, Berlin, Germany; Animal Health Research Institute, Agriculture Research Centre, Cairo, Egypt
| | - Mohamed-Yousif Ibrahim Mohamed
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates
| | - Akela Ghazawi
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates
| | - Afra Abdalla
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates
| | - Hazim O Khalifa
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates; Department of Pharmacology, Faculty of Veterinary Medicine, Kafrelsheikh University, Egypt
| | - Mushtaq Khan
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, P.O. Box 1555, United Arab Emirates; Zayed Center for Health Sciences, United Arab Emirates University, Al Ain, P.O. Box 15551, United Arab Emirates
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6
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Ozdikmenli Tepeli S. A Survey of knowledge, attitude, and practices surrounding antimicrobial use by family dairy farmers to mastitis control. Prev Vet Med 2023; 214:105904. [PMID: 36958150 DOI: 10.1016/j.prevetmed.2023.105904] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 03/14/2023] [Accepted: 03/18/2023] [Indexed: 03/25/2023]
Abstract
This study determined the family dairy farmers' knowledge, attitudes, and practices regarding the management strategy of mastitis, antibiotic use, and antimicrobial resistance in dairy farms in Türkiye. A total of 455 dairy farmers participated in face-to-face surveys from the villages of Çanakkale in Türkiye. A total of 62 questions that were divided into 5 categories were asked of the participants. Farmers (252/455; 55.4%) noted that they had not heard of any term about the expression of microbial resistance. They believe that antibiotic residues (156/455; 34,3%) do not pass into the soil and environment with animal wastes, and diseases such as mastitis (173/455; 38%) cannot be cured without antibiotics. Farmers indicated that they used antibiotic therapy in the treatment of udder diseases such as mastitis at a rate of 44.8%. Moreover, most dairy farmers (78.2%) decided to start antibiotic treatment with the decision of the veterinarian. Farmers believe that the barn environment is not as clean as necessary at a rate of 23.5%, and the necessary hygiene conditions are not followed in animal care 23.4% as the cause of mastitis. They highlighted that they detected mastitis from the redness or swelling of the udder at a rate of 38.2%. 55.8% of the farmers participating in the study had undergone analysis for the diagnosis of mastitis disease. On the other hand, 57.4% of farmers tried natural products such as olive oil, soft soap, vinegar, clay soil, honey, soapy, and yogurt, instead of antibiotics treatment for mastitis diseases. They have been relying mostly on veterinarian recommendations for AU. The use of culture and susceptibility test results for antimicrobial selection should be expanded among veterinarians. All stakeholders should be included in periodic training programs on topics such as AU, AR, preventive treatments for mastitis, vaccination, public health, and environmental health. Surveillance systems are needed to monitor AU and AR in animals, as in human medicine.
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Affiliation(s)
- Seda Ozdikmenli Tepeli
- Department of Veterinary, Yenice Vocational School, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye.
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Ozdikmenli Tepeli S, Numanoglu Cevik Y, Tosun MN, Taylan Yalcin G, Kaya B, Ipek D, Bakkaloglu Z, Simsek H, Zorba NN. Carbapenem resistance and biofilm formation status of Enterobacterales isolated from raw milk via molecular versus phenotypic methods. Antonie Van Leeuwenhoek 2023; 116:67-80. [PMID: 36525156 DOI: 10.1007/s10482-022-01799-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 11/21/2022] [Indexed: 12/23/2022]
Abstract
Antibiotic resistance genes can easily be transferred between bacteria in the biofilm. In the dairy industry, many bacterial species forming biofilms on the surfaces of equipment are widely reported. The experiments reported in this research paper aimed to investigate the carbapenem resistance and biofilm formation properties of Enterobacterales isolates which are spoilage microorganisms obtained from raw milk. In addition, the study determined that whether there was a relationship between the biofilm formation ability or the protein spectra of these isolates. In this study, ninety-two Enterobacterales isolates collected from 173 raw milk samples were investigated. Initially, the isolates were identified as Citrobacter braakii (n = 18), Citrobacter freundii (n = 12), Enterobacter asburiae (n = 1), Enterobacter cloacae (n = 3), Escherichia coli (n = 10), Hafnia alvei (n = 18), Klebsiella oxytoca (n = 1), Serratia fonticola (n = 24), Serratia liquefaciens (n = 4), and Serratia marcescens (n = 1) using MALDI-TOF MS. As a result, carbapenem resistance was determined in 6.5% of the isolates by CIM test, MHT, and the disk diffusion methods, but none of them had blaOXA-48, blaKPC, blaNDM-1, blaOXA23, blaOXA-58, blaOXA-51, blaVIM, and blaIMP genes. This may be due to the effect of other resistance mechanisms such as porin loss or increased flow pump activity. Furthermore, biofilm formation (weak and moderate) was detected in 97.8% of the Enterobacterales isolates. The mass spectra of the moderate biofilm producer isolate of Serratia spp. and the mass spectra of the weak biofilm producers of E.coli presented similarities.
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Affiliation(s)
- Seda Ozdikmenli Tepeli
- Department of Veterinary, Yenice Vocational School, Çanakkale Onsekiz Mart University, Çanakkale, Turkey.
| | - Yasemin Numanoglu Cevik
- Microbiolgy Reference Laboratory and Biological Products Department, General Directorate of Public Health, Minister of Health, Ankara, Turkey
| | - Melike Nur Tosun
- Department of Food Engineering, Graduate School of Natural and Applied Sciences, Çanakkale Onsekiz Mart University, Çanakkale, Turkey
| | - Gizem Taylan Yalcin
- Department of Food Engineering, Graduate School of Natural and Applied Sciences, Çanakkale Onsekiz Mart University, Çanakkale, Turkey
| | - Burcu Kaya
- Department of Food Engineering, Faculty of Engineering, Çanakkale Onsekiz Mart University, Çanakkale, Turkey
| | - Dilvin Ipek
- Department of Food Processing, Ezine Vocational School, Çanakkale Onsekiz Mart University, Çanakkale, Turkey
| | - Zekiye Bakkaloglu
- Microbiolgy Reference Laboratory and Biological Products Department, General Directorate of Public Health, Minister of Health, Ankara, Turkey
| | - Husniye Simsek
- Microbiolgy Reference Laboratory and Biological Products Department, General Directorate of Public Health, Minister of Health, Ankara, Turkey
| | - Nukhet Nilufer Zorba
- Department of Food Engineering, Faculty of Engineering, Çanakkale Onsekiz Mart University, Çanakkale, Turkey
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LOEZA-LARA PD, MEDINA-ESTRADA RI, BRAVO-MONZÓN ÁE, JIMÉNEZ-MEJÍA R. Frequency and characteristics of ESBL-producing Escherichia coli isolated from Mexican fresh cheese. FOOD SCIENCE AND TECHNOLOGY 2023. [DOI: 10.1590/fst.108222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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9
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ELKENANY RM, ELTAYSH R, ELSAYED M, ABDEL-DAIM M, SHATA R. Characterization of multi-resistant <i>Shigella</i> species isolated from raw cow milk and milk products. J Vet Med Sci 2022; 84:890-897. [PMID: 35527016 PMCID: PMC9353095 DOI: 10.1292/jvms.22-0018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
This study was organized to investigate the prevalence, antibiotic and disinfectant resistance phenotypes and genotypes as well as plasmid profiles of Shigella species
isolated from raw cow milk and milk products in Egypt. Genotypic analysis was performed to determine the presence of β-lactamase encoding genes
(blaTEM, blaCTX-M, blaOXA-1 and blaSHV), tet(A) and
qacE∆. Forty-two (7%) Shigella isolates (S. dysenteriae, S. flexneri, and S. sonnei) were recovered, with S. dysenteriae
as the predominant type. Antibiotic sensitivity tests showed that 71.4% of Shigella isolates were resistant to three or more antibiotic classes (multidrug-resistant). High
resistance rates were observed against tetracyclines (100%), ampicillin, amoxicillin-clavulanate (90.5%, each) and cefaclor (66.7%), while no resistance was detected against imipenem,
sulfamethoxazole/trimethoprim, and azithromycin. Disinfectant susceptibility test of Shigella isolates revealed resistance to phenolic compound (vanillic acid), while 85.7%
of the Shigella isolates were resistant to benzalkonium chloride. Uniplex PCR analysis declared the existence of β-lactamase encoding genes
(blaTEM in all isolates and blaCTX-M in 28.6% of isolates) and, tet(A) in all isolates and 85.7% of the isolates
were positive for qacE∆1, while all isolates were negative for blaOXA-1 and blaSHV. All Shigella
extended spectrum β-lactamases (ESBL) producers (12, 100%) were positive for the blaTEM, blaCTX-M, and qacE∆1 genes.
Furthermore, plasmid profiling revealed seven distinct plasmid patterns (P1–P7), ranging from 1.26 to 33.61 kb, among all the Shigella strains; S.
dysenteriae exhibited the greatest variance. The co-transfer of β-lactamase genes (blaTEM and blaCTX-M) and
qacE∆1 genes was observed by conjugation from all ESBL producers to a recipient strain. These findings indicate the emergence of Shigella species in Egypt
that exhibited multi-resistance to either antibiotics (particularly ESBL producer strains) or disinfectants. Thus, the resistance of Shigella species should regularly be
monitored and appropriate measures should be taken to manage this problem.
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Affiliation(s)
- Rasha M. ELKENANY
- Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine, Mansoura University
| | - Rasha ELTAYSH
- Department of Pharmacology, Faculty of Veterinary Medicine, Mansoura University
| | - Mona ELSAYED
- Department of Hygiene and Zoonoses, Faculty of Veterinary Medicine, Mansoura University
| | | | - Radwa SHATA
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Mansoura University
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Aslantaş Ö, Yılmaz EŞ, Büyükaltay K, Kocabağ HD. Whole‐genome sequencing of extended‐spectrum β‐lactamase (ESBL)‐producing
Enterobacteriaceae
from retail raw milk. INT J DAIRY TECHNOL 2021. [DOI: 10.1111/1471-0307.12828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Özkan Aslantaş
- Department of Microbiology Faculty of Veterinary MedicineHatay Mustafa Kemal University HatayTurkey
| | - Ebru Şebnem Yılmaz
- Department of Biology Faculty of Arts and Science Hatay Mustafa Kemal University HatayTurkey
| | - Kaan Büyükaltay
- Bioinformatic Institute Middle East Technical University AnkaraTurkey
| | - Hamide Deniz Kocabağ
- Graduate School of Natural and Applied Sciences Hatay Mustafa Kemal University Hatay Turkey
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11
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Mechaala S, Bouatrous Y, Adouane S. First report on the molecular characterization and the occurrence of extended‐spectrum β‐lactamase producing
Enterobacteriaceae
in unpasteurized bovine's buttermilk. J Food Saf 2021. [DOI: 10.1111/jfs.12949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Sara Mechaala
- Department of Natural Sciences and Life Mohamed Khider University Biskra Algeria
- Laboratory of Genetics, Biotechnology, and Valorization of Bio‐resources (GBVB), Faculty of Exact Sciences and Sciences of Nature and Life Mohamed Khider University Biskra Algeria
| | - Yamina Bouatrous
- Department of Natural Sciences and Life Mohamed Khider University Biskra Algeria
- Laboratory of Genetics, Biotechnology, and Valorization of Bio‐resources (GBVB), Faculty of Exact Sciences and Sciences of Nature and Life Mohamed Khider University Biskra Algeria
| | - Selma Adouane
- Laboratory of Genetics, Biotechnology, and Valorization of Bio‐resources (GBVB), Faculty of Exact Sciences and Sciences of Nature and Life Mohamed Khider University Biskra Algeria
- Department of Agricultural Sciences Mohamed Khider University Biskra Algeria
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12
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Abreu ACDS, Carazzolle MF, Crippa BL, Barboza GR, Mores Rall VL, de Oliveira Rocha L, Silva NCC. Bacterial diversity in organic and conventional Minas Frescal cheese production using targeted 16S rRNA sequencing. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2021.105139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Ahmad I, Khattak S, Ali R, Nawaz N, Ullah K, Khan SB, Ali M, Patching SG, Mustafa MZ. Prevalence and molecular characterization of multidrug‐resistant
Escherichia coli
O157
:
H7
from dairy milk in the Peshawar region of Pakistan. J Food Saf 2021. [DOI: 10.1111/jfs.12941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Irshad Ahmad
- Department of Molecular Biology and Genetics Institute of Basic Medical Sciences, Khyber Medical University Peshawar Pakistan
| | - Sonia Khattak
- Department of Molecular Biology and Genetics Institute of Basic Medical Sciences, Khyber Medical University Peshawar Pakistan
| | - Roshan Ali
- Department of Molecular Biology and Genetics Institute of Basic Medical Sciences, Khyber Medical University Peshawar Pakistan
| | - Nighat Nawaz
- Department of Chemistry Islamia College, Peshawar Peshawar Pakistan
| | - Kalim Ullah
- Department of Zoology Kohat University of Science & Technology Kohat Pakistan
| | - Sher Bahadar Khan
- Department of Animal Health The University of Agriculture Peshawar Pakistan
| | - Mumtaz Ali
- Directorate General of Livestock and Dairy Development Peshawar Pakistan
| | - Simon G. Patching
- School of Biomedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds Leeds UK
| | - Mohammad Zahid Mustafa
- Center for Advanced Studies in Vaccinology and Biotechnology (CASVAB), University of Balochistan Quetta Pakistan
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14
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Singh F, Hirpurkar SD, Rawat N, Shakya S, Kumar R, Rajput PK, Kumar S. Occurrence of the genes encoding carbapenemases, ESBLs and class 1 integron-integrase among fermenting and non-fermenting bacteria from retail goat meat. Lett Appl Microbiol 2020; 71:611-619. [PMID: 32767781 DOI: 10.1111/lam.13368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 08/03/2020] [Accepted: 08/04/2020] [Indexed: 12/28/2022]
Abstract
The present study was planned to detect the genes encoding carbapenemases, ESBLs and class 1 integron-integrase among bacteria obtained from retail goat meat. Fermenting and non-fermenting bacterial isolates (n = 57), recovered from 61 goat meat samples, were identified by 16S rRNA gene sequencing. Antimicrobial susceptibility of isolates was tested by the broth dilution method using ceftazidime, cefotaxime, meropenem and imipenem. Plasmids were isolated and tested for their physical characters. Plasmids were subjected to screening of carbapenemase, ESBL and intI1 gene. Conjugation assay was performed using blaNDM -positive isolates as the donor, and Escherichia coli HB101 as the recipient. Isolates showed the high rates of resistance to ceftazidime (77·2%), cefotaxime (70·2%), meropenem (22·8%) and imipenem (17·5%). They showed variability in number and size (~1 to >20 kb) of plasmids. Among all, 1, 4, 13 and 31 isolates showed the blaKPC , blaNDM , blaSHV and blaTEM genes, respectively. The blaKPC-2 gene was observed in one E. coli isolate. The blaNDM-1 gene was detected in Stenotrophomonas maltophilia (n = 2), Acinetobacter baumannii (n = 1) and Ochrobactrum anthropi (n = 1) isolates. These isolates co-harboured the blaTEM and blaSHV genes. The intI1 gene was detected in 22 (38·6%) isolates, and 16 of these isolates showed the carbapenemase and/or ESBL genes. The conjugative movement of blaNDM gene could not be proved after three repetitive mating experiments. The presence of genes encoding carbapenemases and ESBLs in bacteria from goat meat poses public health risks.
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Affiliation(s)
- F Singh
- Department of Veterinary Microbiology, College of Veterinary Science and Animal Husbandry, Anjora, Chhattisgarh, India.,Animal Health Division, ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India
| | - S D Hirpurkar
- Department of Veterinary Microbiology, College of Veterinary Science and Animal Husbandry, Anjora, Chhattisgarh, India
| | - N Rawat
- Department of Veterinary Microbiology, College of Veterinary Science and Animal Husbandry, Anjora, Chhattisgarh, India
| | - S Shakya
- Department of Veterinary Public Health and Epidemiology, College of Veterinary Science and Animal Husbandry, Anjora, Chhattisgarh, India
| | - R Kumar
- Animal Biotechnology Section, ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India
| | - P K Rajput
- Animal Biotechnology Section, ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India
| | - S Kumar
- Animal Biotechnology Section, ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India
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15
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Sukmawinata E, Uemura R, Sato W, Thu Htun M, Sueyoshi M. Multidrug-Resistant ESBL/AmpC-Producing Klebsiella pneumoniae Isolated from Healthy Thoroughbred Racehorses in Japan. Animals (Basel) 2020; 10:ani10030369. [PMID: 32106501 PMCID: PMC7143125 DOI: 10.3390/ani10030369] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 02/13/2020] [Accepted: 02/20/2020] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Extended-spectrum β-lactamases (ESBLs) and AmpC β-lactamases (AmpCs) have been recognized as an emerging global problem in humans and animals. These enzymes provide a mechanism of resistance by inactivating β-lactam antibiotics and are mostly encoded on plasmids, which can be easily transmitted to other bacteria in humans, animals, and the environment. Several clinical diseases caused by Klebsiella spp. infection have been confirmed in the horse community. The emergence of antimicrobial resistance in Klebsiella spp. increases the risk of treatment failure in infected horses. In this study, we investigated the presence of ESBL/AmpC-producing Klebsiella spp. isolated from healthy Thoroughbred racehorses in Japan. The results showed that ESBL/AmpC-producing Klebsiella pneumoniae (ESBL/AmpC-KP) isolated from horses have co-resistance to other β-lactam antibiotics as multidrug-resistant (MDR) bacteria. Genetic relatedness analysis suggested that plasmid-mediated AmpC-KP clones may spread between horses. This is the first study to show K. pneumoniae carrying MDR plasmid-mediated AmpC isolated from racehorses. Continuous monitoring antimicrobial resistance to this species is required in order to control the spread of MDR ESBL/AmpC-KP in the racehorse community. Abstract Extended-spectrum β-lactamase (ESBL)- and AmpC β-lactamase (AmpC)-producing Klebsiella spp. have become a major health problem, leading to treatment failure in humans and animals. This study aimed to evaluate the presence of ESBL/AmpC-producing Klebsiella spp. isolated from racehorses in Japan. Feces samples from 212 healthy Thoroughbred racehorses were collected from the Japan Racing Association Training Centers between March 2017 and August 2018. ESBL/AmpC-producing Klebsiella spp. were isolated using selective medium containing 1 µg/mL cefotaxime. All isolates were subjected to bacterial species identification (MALDI-TOF MS), antimicrobial susceptibility test (disk diffusion test), characterization of resistance genes (PCR), conjugation assay, and genetic relatedness (multilocus sequence typing/MLST). Twelve ESBL/AmpC-producing Klebsiella pneumoniae (ESBL/AmpC-KP) were isolated from 3.3% of horse samples. Antimicrobial resistance profiling for 17 antimicrobials showed all ESBL/AmpC-KP were multidrug-resistant (MDR). Only 1 isolate was confirmed as an ESBL producer (blaCTX-M-2-positive), whereas the other 11 isolates were plasmid-mediated AmpC (pAmpC) producers (blaCMY positive). On the basis of MLST analysis, the ESBL-KP isolate was identified as sequence type (ST)-133 and four different STs among AmpC-KP isolates, ST-145, ST-4830, ST-4831, and ST-4832, were found to share six of the seven loci constituting a single-locus variant. This is the first study to show K. pneumoniae carrying MDR pAmpC isolated from a racehorse.
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Affiliation(s)
- Eddy Sukmawinata
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; (E.S.); (M.S.)
| | - Ryoko Uemura
- Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan; (W.S.); (M.T.H.)
- Center for Animal Diseases Control, University of Miyazaki, Miyazaki 889-2192, Japan
- Correspondence: ; Tel.: +81-985-58-7283
| | - Wataru Sato
- Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan; (W.S.); (M.T.H.)
| | - Myo Thu Htun
- Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan; (W.S.); (M.T.H.)
| | - Masuo Sueyoshi
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; (E.S.); (M.S.)
- Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan; (W.S.); (M.T.H.)
- Center for Animal Diseases Control, University of Miyazaki, Miyazaki 889-2192, Japan
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16
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da Silva PM, da Silva BR, de Oliveira Silva JN, de Moura MC, Soares T, Feitosa APS, Brayner FA, Alves LC, Paiva PMG, Damborg P, Ingmer H, Napoleão TH. Punica granatum sarcotesta lectin (PgTeL) has antibacterial activity and synergistic effects with antibiotics against β-lactamase-producing Escherichia coli. Int J Biol Macromol 2019; 135:931-939. [PMID: 31170488 DOI: 10.1016/j.ijbiomac.2019.06.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 03/30/2019] [Accepted: 06/03/2019] [Indexed: 12/23/2022]
Abstract
The sarcotesta of Punica granatum fruit contains an antimicrobial lectin called PgTeL. In this work, we evaluated the antibacterial activity of PgTeL against five drug-resistant Escherichia coli isolates able to produce β-lactamases. Minimum inhibitory (MIC) and bactericidal (MBC) concentrations were determined by broth dilution. Morphometric and viability analyses were performed by flow cytometry, and ultrastructural changes were evaluated by scanning electron microscopy. Potential synergistic effects of PgTeL with antibiotics and anti-biofilm effect were also evaluated. PgTeL showed antibacterial activity against all isolates with MIC and MBC values ranging from 12.5 to 50.0 μg/mL and from 25.0 to 100.0 μg/mL, respectively. For most isolates, PgTeL postponed the growth start by at least ten hours. At the MIC, the lectin caused alterations in size, shape and structure of bacterial cells. The combination PgTeL-ceftazidime showed a synergistic effect for all isolates. Synergy was also detected with ampicillin (one isolate), carbenicillin (one isolate), cefotaxime (one isolate), cephalexin (four isolates) and cefuroxime (three isolates). PgTeL exhibited anti-biofilm activity against all isolates, causing ≥50% inhibition of biofilms at or above 6.25 μg/mL. The antibacterial effect of PgTeL and its synergy with antibiotics indicate that this fruit-derived molecule may have potential for future treatment of multidrug-resistant infections.
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Affiliation(s)
| | | | | | - Maiara Celine de Moura
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Tatiana Soares
- Centro de Tecnologias Estratégicas do Nordeste (CETENE), Recife, Brazil
| | - Ana Paula Sampaio Feitosa
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | - Fábio André Brayner
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | - Luiz Carlos Alves
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | | | - Peter Damborg
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Hanne Ingmer
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Thiago Henrique Napoleão
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil.
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17
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Collis RM, Burgess SA, Biggs PJ, Midwinter AC, French NP, Toombs-Ruane L, Cookson AL. Extended-Spectrum Beta-Lactamase-Producing Enterobacteriaceae in Dairy Farm Environments: A New Zealand Perspective. Foodborne Pathog Dis 2018; 16:5-22. [PMID: 30418042 DOI: 10.1089/fpd.2018.2524] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Antimicrobial resistance (AMR) is a global issue for both human and animal health. Infections caused by antimicrobial-resistant bacteria present treatment option challenges and are often associated with heightened severity of infection. Antimicrobial use (AMU) in human and animal health is a main driver for the development of antimicrobial-resistant bacteria. Increasing levels of AMU and the development and spread of AMR in food-producing animals, especially in poultry and swine production, has been identified as a food safety risk, but dairy production systems have been less studied. A number of farm management practices may impact on animal disease and as a result can influence the use of antimicrobials and subsequently AMR prevalence. However, this relationship is multifactorial and complex. Several AMR transmission pathways between dairy cattle, the environment, and humans have been proposed, including contact with manure-contaminated pastures, direct contact, or through the food chain from contaminated animal-derived products. The World Health Organization has defined a priority list for selected bacterial pathogens of concern to human health according to 10 criteria relating to health and AMR. This list includes human pathogens such as the extended-spectrum beta-lactamase-producing Enterobacteriaceae (ESBL-E), which can be associated with dairy cattle, their environment, as well as animal-derived food products. ESBL-E represent a potential risk to human and animal health and an emerging food safety concern. This review addresses two areas; first, the current understanding of the role of dairy farming in the prevalence and spread of AMR is considered, highlighting research gaps using ESBL-E as an exemplar; and second, a New Zealand perspective is taken to examine how farm management practices may contribute to on-farm AMU and AMR in dairy cattle.
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Affiliation(s)
- Rose M Collis
- 1 AgResearch Ltd, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand.,2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Sara A Burgess
- 2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Patrick J Biggs
- 2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand.,3 Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand. Massey University, Palmerston North, New Zealand.,4 New Zealand Food Safety Science and Research Centre, Massey University, Palmerston North, New Zealand
| | - Anne C Midwinter
- 2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Nigel P French
- 2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand.,4 New Zealand Food Safety Science and Research Centre, Massey University, Palmerston North, New Zealand
| | - Leah Toombs-Ruane
- 2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Adrian L Cookson
- 1 AgResearch Ltd, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand.,2 Molecular Epidemiology and Veterinary Public Health Laboratory (mEpiLab), Infectious Disease Research Centre, School of Veterinary Science, Massey University, Palmerston North, New Zealand
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