RT Journal Article T1 Escherichia coli from six European countries reveals differences in profile and distribution of critical antimicrobial resistance determinants within One Health compartments, 2013 to 2020 A1 Kaspersen, Håkon P. A1 Brouwer, Michael SM A1 Nunez Garcia, Javier A1 Cárdenas Rey, Ingrid A1 AbuOun, Manal A1 Duggett, Nicholas A1 Ellaby, Nicholas A1 Delgado Blas, José Francisco A1 Hammerl, Jens A. A1 Getino, Maria A1 Serna Bernaldo, Carlos A1 Naas, Thierry A1 Veldman, Kees T. A1 Bossers, Alex A1 Sunde, Marianne A1 Mo, Solveig S. A1 Jørgensen, Silje B. A1 Ellington, Matthew A1 González Zorn, Bruno A1 La Ragione, Roberto A1 Glaser, Philippe A1 Anjum, Muna F. AB Background:Antimicrobial resistance (AMR) is a global threat. Monitoring using an integrated One Health approach is essential to detect changes in AMR occurrence.Aim:We aimed to detect AMR genes in pathogenic and commensal Escherichia coli collected 2013–2020 within monitoring programmes and research from food animals, food (fresh retail raw meat) and humans in six European countries, to compare vertical and horizontal transmission.Methods:We whole genome sequenced (WGS) 3,745 E. coli isolates, detected AMR genes using ResFinder and performed phylogenetic analysis to determine isolate relatedness and transmission. A BLASTn-based bioinformatic method compared draft IncI1 genomes to conserved plasmid references from Europe.Results:Resistance genes to medically important antimicrobials (MIA) such as extended-spectrum cephalosporins (ESC) were widespread but predicted resistance to MIAs authorised for human use (carbapenem, tigecycline) was detected only in two human and three cattle isolates. Phylogenetic analysis clustered E. coli according to phylogroups; commensal animal isolates showed greater diversity than those from human patients. Only 18 vertical animal-food and human-animal transmission events of E. coli clones were detected. However, IncI1 plasmids from different sources and/or countries carrying resistance to ESCs were conserved and widely distributed, although these variants were rarely detected in human pathogens.Conclusion:Using WGS we demonstrated AMR is driven vertically and horizontally. Human clinical isolates were more closely related, but their IncI1 plasmids were more diverse, while animal or food isolates were less similar with more conserved IncI1 plasmids. These differences likely arose from variations in selective pressure, influencing AMR evolution and transmission. PB European Centre for Disease Prevention and Control SN 1560-7917 YR 2024 FD 2024 LK https://hdl.handle.net/20.500.14352/113510 UL https://hdl.handle.net/20.500.14352/113510 LA eng NO Kaspersen, H. P., Brouwer, M. S., Nunez-Garcia, J., Cárdenas-Rey, I., AbuOun, M., Duggett, N., Ellaby, N., Delgado-Blas, J., Hammerl, J. A., Getino, M., Serna, C., Naas, T., Veldman, K. T., Bossers, A., Sunde, M., Mo, S. S., Jørgensen, S. B., Ellington, M., Gonzalez-Zorn, B., La Ragione, R., … Anjum, M. F. (2024). Escherichia coli from six European countries reveals differences in profile and distribution of critical antimicrobial resistance determinants within One Health compartments, 2013 to 2020. Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin, 29(47), 2400295. https://doi.org/10.2807/1560-7917.ES.2024.29.47.2400295 NO Contribución de autores:HK performed the phylogenetic analysis and the transmission cluster detection. MB assembled all raw data and performed all analysis for ResFinder to detect AMR genes. JNG performed plasmid analysis, including constructing a novel tool. MFA conceived the project; MFA, JNG, MB, and HK wrote the initial manuscript, with MFA providing oversight and direction. HK, MB, JNG, ICR, MA, ND, NE, JDS, JAH, MG, CS, TN, KTV, AB, MS, SSM, SBJ, ME, BGZ, RLR, PG and MFA contributed to the overall project design, editing, and reviewing of the manuscript. NO European Commission NO Dutch Ministry for Agriculture, Nature and Food Quality (Países Bajos) NO Bundesinstitut für Risikobewertung (Alemania) NO Veterinary Medicines Directorate (Reino Unido) NO University of Surrey (Reino Unido) NO Higher Education Funding Council (Reino Unido) NO Norwegian Veterinary Institute (Noruega) DS Docta Complutense RD 18 dic 2025