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Che M, Fresno AH, Calvo-Fernandez C, Hasman H, Kurittu PE, Heikinheimo A, Hansen LT. Comparison of IncK- blaCMY-2 Plasmids in Extended-Spectrum Cephalosporin-Resistant Escherichia coli Isolated from Poultry and Humans in Denmark, Finland, and Germany. Antibiotics (Basel) 2024; 13:349. [PMID: 38667025 PMCID: PMC11047599 DOI: 10.3390/antibiotics13040349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 03/27/2024] [Accepted: 03/29/2024] [Indexed: 04/29/2024] Open
Abstract
Escherichia coli carrying IncK-blaCMY-2 plasmids mediating resistance to extended-spectrum cephalosporins (ESC) has been frequently described in food-producing animals and in humans. This study aimed to characterize IncK-blaCMY-2-positive ESC-resistant E. coli isolates from poultry production systems in Denmark, Finland, and Germany, as well as from Danish human blood infections, and further compare their plasmids. Whole-genome sequencing (Illumina) of all isolates (n = 46) confirmed the presence of the blaCMY-2 gene. Minimum inhibitory concentration (MIC) testing revealed a resistant phenotype to cefotaxime as well as resistance to ≥3 antibiotic classes. Conjugative transfer of the blaCMY-2 gene confirmed the resistance being on mobile plasmids. Pangenome analysis showed only one-third of the genes being in the core with the remainder being in the large accessory gene pool. Single nucleotide polymorphism (SNP) analysis on sequence type (ST) 429 and 1286 isolates showed between 0-60 and 13-90 SNP differences, respectively, indicating vertical transmission of closely related clones in the poultry production, including among Danish, Finnish, and German ST429 isolates. A comparison of 22 ST429 isolates from this study with 80 ST429 isolates in Enterobase revealed the widespread geographical occurrence of related isolates associated with poultry production. Long-read sequencing of a representative subset of isolates (n = 28) allowed further characterization and comparison of the IncK-blaCMY-2 plasmids with publicly available plasmid sequences. This analysis revealed the presence of highly similar plasmids in ESC-resistant E. coli from Denmark, Finland, and Germany pointing to the existence of common sources. Moreover, the analysis presented evidence of global plasmid transmission and evolution. Lastly, our results indicate that IncK-blaCMY-2 plasmids and their carriers had been circulating in the Danish production chain with an associated risk of spreading to humans, as exemplified by the similarity of the clinical ST429 isolate to poultry isolates. Its persistence may be driven by co-selection since most IncK-blaCMY-2 plasmids harbor resistance factors to drugs used in veterinary medicine.
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Affiliation(s)
- Meiyao Che
- National Food Institute, Technical University of Denmark, 2800 Lyngby, Denmark; (M.C.); (C.C.-F.)
| | - Ana Herrero Fresno
- Department of Biochemistry and Molecular Biology, Faculty of Sciences, Campus Terra, Universidade da Santiago de Compostela (USC), 27002 Lugo, Spain;
| | - Cristina Calvo-Fernandez
- National Food Institute, Technical University of Denmark, 2800 Lyngby, Denmark; (M.C.); (C.C.-F.)
| | - Henrik Hasman
- Reference Laboratory for Antibiotic Resistance, Statens Serum Institut, Artillerivej 5, 2300 Copenhagen, Denmark;
| | - Paula E. Kurittu
- Department of Food Health and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, 00014 Helsinki, Finland; (P.E.K.); (A.H.)
| | - Annamari Heikinheimo
- Department of Food Health and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, 00014 Helsinki, Finland; (P.E.K.); (A.H.)
- Microbiology Unit, Finnish Food Authority, Mustialankatu 3, 00790 Helsinki, Finland
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Ortega-Balleza JL, Guerrero A, Castro-Escarpulli G, Martínez-Vázquez AV, Cruz-Hernández MA, de Luna-Santillana EDJ, Acosta-Cruz E, Rodríguez-Sánchez IP, Rivera G, Bocanegra-García V. Genomic Analysis of Multidrug-Resistant Escherichia coli Strains Isolated in Tamaulipas, Mexico. Trop Med Infect Dis 2023; 8:458. [PMID: 37888586 PMCID: PMC10610597 DOI: 10.3390/tropicalmed8100458] [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: 08/29/2023] [Revised: 09/19/2023] [Accepted: 09/22/2023] [Indexed: 10/28/2023] Open
Abstract
The global spread of antimicrobial resistance genes (ARGs) is a major public health concern. Mobile genetic elements (MGEs) are the main drivers of this spread by horizontal gene transfer (HGT). Escherichia coli is widespread in various environments and serves as an indicator for monitoring antimicrobial resistance (AMR). Therefore, the objective of this work was to evaluate the whole genome of multidrug-resistant E. coli strains isolated from human clinical, animal, and environmental sources. Four E. coli strains previously isolated from human urine (n = 2), retail meat (n = 1), and water from the Rio Grande River (n = 1) collected in northern Tamaulipas, Mexico, were analyzed. E. coli strains were evaluated for antimicrobial susceptibility, followed by whole genome sequencing and bioinformatic analysis. Several ARGs were detected, including blaCTX-M-15, blaOXA-1, blaTEM-1B, blaCMY-2, qnrB, catB3, sul2, and sul3. Additionally, plasmid replicons (IncFIA, IncFIB, IncFII, IncY, IncR, and Col) and intact prophages were also found. Insertion sequences (ISs) were structurally linked with resistance and virulence genes. Finally, these findings indicate that E. coli strains have a large repertoire of resistance determinants, highlighting a high pathogenic potential and the need to monitor them.
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Affiliation(s)
- Jessica L. Ortega-Balleza
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
| | - Abraham Guerrero
- CONACyT Program, Centro de Investigación en Alimentación y Desarrollo, Mazatlán 82112, Mexico;
| | - Graciela Castro-Escarpulli
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Ciudad de Mexico 07738, Mexico;
| | - Ana Verónica Martínez-Vázquez
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
| | - María Antonia Cruz-Hernández
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
| | - Erick de Jesús de Luna-Santillana
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
| | - Erika Acosta-Cruz
- Departamento de Biotecnología, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Saltillo Coahuila 25280, Mexico;
| | - Irám Pablo Rodríguez-Sánchez
- Laboratorio de Fisiología Molecular y Estructural, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Ave. Pedro de Alba s/n cruz con Ave. Manuel L. Barragán, San Nicolás de los Garza 66455, Mexico;
| | - Gildardo Rivera
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
| | - Virgilio Bocanegra-García
- Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Boulevard del Maestro SN esq. Elías Piña, Col. Narciso Mendoza, Reynosa 88710, Mexico; (J.L.O.-B.); (A.V.M.-V.); (M.A.C.-H.); (E.d.J.d.L.-S.); (G.R.)
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Mwenifumbo M, Cookson AL, Zhao S, Fayaz A, Browne AS, Benschop J, Burgess SA. The characterisation of antimicrobial resistant Escherichia coli from dairy calves. J Med Microbiol 2023; 72. [PMID: 37578342 DOI: 10.1099/jmm.0.001742] [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] [Indexed: 08/15/2023] Open
Abstract
Introduction. Dairy calves, particularly pre-weaned calves have been identified as a common source of multidrug resistant (MDR) Escherichia coli.Gap statement. E. coli strains isolated from dairy calves and the location of their resistance genes (plasmid or chromosomal) have not been well characterised.Aim. To characterise the phenotypic and genotypic features as well as the population structure of antimicrobial-resistant E. coli isolated from calves located on dairy farms that feed waste-milk to their replacement calves.Methodology. Recto-anal swab enrichments from 40 dairy calves (≤ 14 days old) located on four dairy farms were examined for tetracycline, streptomycin, ciprofloxacin, and third-generation cephalosporin resistant E. coli. Whole genome sequencing was performed using both short- and long-read technologies on selected antimicrobial resistant E. coli.Results. Fifty-eight percent (23/40) of calves harboured antimicrobial resistant E. coli: 43 % (17/40) harboured tetracycline resistant, and 23 % (9/40) harboured chromosomal mediated AmpC producing E. coli. Whole genome sequencing of 27 isolates revealed five sequence types, with ST88 being the dominant ST (17/27, 63 % of the sequenced isolates) followed by ST1308 (3/27, 11 %), along with the extraintestinal pathogenic E. coli lineages ST69 (3/27, 11 %), ST10 (2/27, 7 %), and ST58 (2/27, 7 %). Additionally, 16 isolates were MDR, harbouring additional resistance genes that were not tested phenotypically. Oxford Nanopore long-read sequencing technologies enabled the location of multiple resistant gene cassettes in IncF plasmids to be determined.Conclusion. Our study identified a high incidence of tetracycline and streptomycin-resistant E. coli in dairy calves, and highlighted the presence of multidrug-resistant strains, emphasising the need for further investigation into potential associations with farm management practices.
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Affiliation(s)
- Merning Mwenifumbo
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
- Present address: Faculty of Veterinary Medicine, Lilongwe University of Agriculture & Natural Resources, Lilongwe, Malawi
| | - Adrian L Cookson
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
- Food Systems Integrity, Hopkirk Research Institute, cnr University & Library Rds, AgResearch Ltd, Palmerston North 4442, New Zealand
| | - Shengguo Zhao
- Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China
| | - Ahmed Fayaz
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
| | - A Springer Browne
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
| | - Jackie Benschop
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
| | - Sara A Burgess
- School of Veterinary Science, Hopkirk Research Institute, cnr University & Library Rds Massey University, Palmerston North 4442, New Zealand
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Joddha HB, Mathakiya RA, Joshi KV, Khant RB, Golaviya AV, Hinsu AT, Desai MR, Jakhesara SJ, Koringa PG. Profiling of Antimicrobial Resistance Genes and Integron from Escherichia coli Isolates Using Whole Genome Sequencing. Genes (Basel) 2023; 14:1212. [PMID: 37372392 DOI: 10.3390/genes14061212] [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: 03/31/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/29/2023] Open
Abstract
This study is designed to investigate Escherichia coli for the antibiotic resistance genes (ARGs) and integrons from healthy as well as diarrhoeic/diseased animals/birds' faecal samples. A total of eight samples were selected for the study; from each animal, two samples were taken, one from healthy animals/birds and one from diarrhoeic/diseased animals/birds. Antibiotic sensitivity testing (AST) and whole genome sequencing (WGS) was performed for selected isolates. The E. coli isolates showed resistance to moxifloxacin, followed by erythromycin, ciprofloxacin, pefloxacin, tetracycline, levofloxacin, ampicillin, amoxicillin, and sulfadiazine (4/8, 50.00% each). The E. coli isolates were 100% sensitive to amikacin, followed by chloramphenicol, cefixime, cefoperazone, and cephalothin. A total of 47 ARGs from 12 different antibiotic classes were detected among the eight isolates by WGS. The different classes of antibiotics included aminoglycoside, sulphonamide, tetracycline, trimethoprim, quinolone, fosfomycin, phenicol, macrolide, colistin, fosmidomycin, and multidrug efflux. The class 1 integrons were detected in 6/8 (75.00%) isolates with 14 different gene cassettes.
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Affiliation(s)
- Harshrajsinh B Joddha
- Department of Veterinary Microbiology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Rafiyuddin A Mathakiya
- Department of Veterinary Microbiology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Kuldip V Joshi
- Department of Veterinary Microbiology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Ravindra B Khant
- Department of Veterinary Microbiology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Akash V Golaviya
- Department of Veterinary Microbiology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Ankit T Hinsu
- Department of Animal Biotechnology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Mansi R Desai
- Department of Animal Biotechnology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Subhash J Jakhesara
- Department of Animal Biotechnology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
| | - Prakash G Koringa
- Department of Animal Biotechnology, College of Veterinary Science and A H, Kamdhenu University, Anand 388001, Gujarat, India
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Characterization of Escherichia coli and Other Enterobacterales Resistant to Extended-Spectrum Cephalosporins Isolated from Dairy Manure in Ontario, Canada. Appl Environ Microbiol 2023; 89:e0186922. [PMID: 36695602 PMCID: PMC9972979 DOI: 10.1128/aem.01869-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Extended-spectrum cephalosporins (ESCs) resistance genes, such as blaCTX-M, blaCMY, and blaSHV, have been found regularly in bacteria from livestock. However, information on their distribution in dairy cattle in Canada and on the associated genome sequences of ESC-resistant Enterobacterales is sparse. In this study, the diversity and distribution of ESC-resistant Escherichia coli throughout manure treatments in six farms in Southern Ontario were assessed over a one-year period, and their ESC-resistance plasmids were characterized. The manure samples were enriched using selective media. The resulting isolates were screened via polymerase chain reaction for blaCTX-M, blaCMY, and blaSHV. No E. coli carrying blaSHV were detected. Escherichia coli (n = 248) carrying blaCTX-M or blaCMY underwent whole-genome sequencing using an Illumina MiSeq/NextSeq. These isolates were typed using multilocus sequence typing (MLST) and their resistance gene profiles. A subset of E. coli (n = 28) were sequenced using Oxford Nanopore Technologies. Plasmids were assembled using Unicycler and characterized via the resistance genes pattern, replicon type, plasmid MLST, phylogenetic analysis, and Mauve alignments. The recovery of ESC-resistant Enterobacterales (18 species, 8 genera) was drastically reduced in manure outputs. However, multiple treatment stages were needed to attain a significant reduction. 62 sequence types were identified, with ST10, ST46, ST58, ST155, ST190, ST398, ST685, and ST8761 being detected throughout the treatment pipeline. These STs overlapped with those found on multiple farms. The ESC-resistance determinants included CTX-M-1, -14, -15, -17, -24, -32, -55, and CMY-2. The plasmids carrying blaCTX-M were more diverse than were the plasmids carrying blaCMY. Known "epidemic plasmids" were detected for both blaCTX-M and blaCMY. IMPORTANCE The increase in antimicrobial resistance is of concern for human and animal health, especially when resistance is conferred to extended-spectrum cephalosporins, which are used to treat serious infections in both human and veterinary medicine. Bacteria carrying extended-spectrum cephalosporin resistance genes, including blaCTX-M and blaCMY, are frequently found in dairy manure. Manure treatment influences the loads and diversity of bacteria, including those carrying antimicrobial resistance genes, such as Enterobacterales and Escherichia coli. Any bacteria that survive the treatment process are subsequently applied to the environment. Enterobacterales carrying blaCTX-M or blaCMY can contaminate soil and crops consumed by humans and animals, thereby increasing the potential for antimicrobial resistance genes to integrate into the human gut microflora through horizontal gene transfer. This furthers the dissemination of resistance. Therefore, it is imperative to understand the effects manure treatments have on ESC-resistance in environmentally applied manure.
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Acero Plazas VM, Pulido Delgado EY, Gil Tibocha DM, Arenas Suárez NE. Evaluación de la administración de medicamentos veterinarios en hatos lecheros de quince municipios de Cundinamarca, Colombia. Rev Salud Publica (Bogota) 2022. [DOI: 10.15446/rsap.v24n4.102018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Objetivo Evaluar el conocimiento en el uso de Medicamentos de Uso Veterinario (MUV) de los productores ganaderos y personal involucrado en Bogotá y municipios aledaños.
Métodos Se realizó un estudio de corte transversal a través de entrevistas a operarios y productores ganaderos de una muestra de 30 hatos lecheros localizados en 15 municipios cerca de Bogotá, Cundinamarca.
Resultados Se identificó la implementación de prácticas para la administración de MUV, incluyendo parámetros que influencian su administración y conocimientos en las personas que los prescriben y administran. Se encontró que los medicamentos de mayor frecuencia fueron los antimicrobianos con 60,7%, entre los cuales se destaca el uso de penicilina y oxitetraciclina. Los MUV inyectables (parenterales) fueron las formas más frecuentes de aplicación con un 64,7%. Se identificaron 251 MUV en los hatos lecheros, de los cuales el 81,3% están compuestos por principios activos que requieren tiempo de retiro en leche y carne. Se destaca el rol del mayordomo en el cuidado animal a nivel diagnóstico y administración del tratamiento.
Conclusión El presente estudio sugiere que el uso de MUV es implementado empíricamente en producciones lecheras y podría contribuir a mediano y largo plazo a la emergencia de cepas con resistencia a MUV.
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Bakry N, Awad W, Ahmed S, Kamel M. The role of Musca domestica and milk in transmitting pathogenic multidrug-resistant Escherichia coli and associated phylogroups to neonatal calves. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:39593-39609. [PMID: 35107727 DOI: 10.1007/s11356-022-18747-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Escherichia coli, as a global source of antimicrobial resistance, is a serious veterinary and public health concern. The transmission of pathogenic multidrug-resistant (MDR) E. coli within diarrheic calves and its correlation with Musca domestica and milk strains have been investigated. In total, 110, 80, and 26 E. coli strains were obtained from 70 rectal swabs from diarrheic calves, 60 milk samples and 20 M. domestica, respectively. Molecular pathotyping of E. coli revealed the presence of pathogenic E. coli with a higher percentage of shigatoxigenic strains within diarrheic calves and M. domestica at 46.4% and 34.6%, respectively. Phenotypic antimicrobial resistance revealed higher β-lactams resistance except for cefquinome that exhibited low resistance in M.domestica and milk strains at 30.8% and 30%, respectively. The extended-spectrum cephalosporin (ESC) resistant strains were detected within fecal, M. domestica, and milk strains at 69.1%, 73.1%, and 71.3%, respectively. All E. coli strains isolated from M. domestica exhibited MDR, while fecal and milk strains were harboring MDR at 99.1% and 85%, respectively. Molecular detection of resistant genes revealed the predominance of the blaTEM gene, while none of these strains harbored the blaOXA gene. The highest percentages for blaCTXM and blaCMYII genes were detected in M. domestica strains at 53.8% and 61.5%, respectively. Regarding colistin resistance, the mcr-1 gene was detected only in fecal and milk strains at 35.5% and 15%, respectively. A high frequency of phylogroup B2 was detected within fecal and M. domestica strains, while milk strains were mainly assigned to the B1 phylogroup. Pathogenic E. coli strains with the same phenotypic and genotypic antimicrobial resistance and phylogroups were identified for both diarrheic calves and M. domestica, suggesting that the possible role of M. domestica in disseminating pathogenic strains and antimicrobial resistance in dairy farms.
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Affiliation(s)
- Noha Bakry
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Walid Awad
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Samia Ahmed
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Mohamed Kamel
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.
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The Effects of Feeding Waste Milk Containing Antimicrobial Residues on Dairy Calf Health. Pathogens 2021; 10:pathogens10020112. [PMID: 33499385 PMCID: PMC7911522 DOI: 10.3390/pathogens10020112] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 01/15/2021] [Accepted: 01/20/2021] [Indexed: 01/17/2023] Open
Abstract
A number of studies have reported that there is a high prevalence of antimicrobial-resistant faecal bacteria excreted by dairy calves. Although faecal shedding is influenced by a variety of factors, such as the environment and calf age, feeding milk with antimicrobial residues contributes significantly to an increased prevalence of antimicrobial-resistant (AMR) bacteria, such as extended spectrum beta-lactamase (ESBL)-producing E. coli. As a follow-up to the European Food Safety Authority (EFSA) Scientific Opinion on the risk of AMR development in dairy calves published in January 2017, this review aims to illustrate more recent research in this area, focusing on the period 2016 to 2020. A total of 19 papers are reviewed here. The vast majority assess the commensal faecal bacteria, E. coli, isolated from dairy calves, in particular its antimicrobial-resistant forms such as ESBL-producing E. coli and AmpC-producing E. coli. The effect of waste milk feeding on the prevalence of pathogens such as Salmonella spp. has also been investigated. Current research findings include positive effects on daily liveweight gain and other advantages for calf health from feeding waste milk compared to milk replacer. However, the negative effects, such as the demonstrable selection for antimicrobial-resistant bacteria, the shift in the intestinal microbiome and the possible negative consequences that these could have on global public health, should always be taken into consideration.
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