{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T08:53:20Z","timestamp":1790931200407,"version":"4.1.0"},"reference-count":66,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T00:00:00Z","timestamp":1790899200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Vet. Sci."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>\n                      Poultry-associated\n                      <jats:italic>Escherichia coli<\/jats:italic>\n                      can harbor clinically relevant antimicrobial resistance determinants, but the clonal and mobile-genetic backgrounds of \u03b2-lactam resistance remain incompletely characterized in Central European production systems. We investigated a phenotypically ESBL-suspect collection of 87\n                      <jats:italic>E. coli<\/jats:italic>\n                      isolates recovered from tracheal and cloacal samples collected on 23 commercial chicken farms in Hungary between 2022 and 2023.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Antimicrobial susceptibility testing was integrated with whole-genome sequencing, allele-level resistance-gene identification, Achtman multilocus sequence typing, predicted plasmid reconstruction, pan-genome analysis and recombination-filtered core-genome phylogenetics.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Phenotypic ESBL production was confirmed in 19\/87 isolates (21.8%). The principal ESBL alleles were\n                      <jats:italic>bla<\/jats:italic>\n                      <jats:sub>CTX-M-1<\/jats:sub>\n                      (11\/87) and\n                      <jats:italic>bla<\/jats:italic>\n                      <jats:sub>CTX-M-15<\/jats:sub>\n                      (3\/87), while\n                      <jats:italic>bla<\/jats:italic>\n                      <jats:sub>CMY-2<\/jats:sub>\n                      was detected in four isolates. Complete Achtman sequence types were assigned to 44 isolates, representing 30 sequence types. Ten of 11\n                      <jats:italic>bla<\/jats:italic>\n                      <jats:sub>CTX-M-1<\/jats:sub>\n                      occurrences were computationally assigned by MOB-suite to predicted conjugative IncI-gamma\/K1 plasmid bins. The recombination-filtered phylogeny resolved multiple distinct lineages, showing that ESBL positivity and CTX-M carriage were not restricted to a single clone.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>\n                      These findings indicate that ESBL- and AmpC-associated resistance occurred across diverse chicken-derived\n                      <jats:italic>E. coli<\/jats:italic>\n                      backgrounds and was frequently associated with predicted plasmid contexts.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fvets.2026.1959409","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T08:02:06Z","timestamp":1790928126000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Polyclonal distribution and predicted plasmid context of ESBL- and AmpC-associated resistance in chicken-derived Escherichia coli from Hungary"],"prefix":"10.3389","volume":"13","author":[{"given":"\u00c1d\u00e1m","family":"Kerek","sequence":"first","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gergely \u00c1lmos","family":"Tornyos","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Levente Hunor","family":"Husz","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M\u00e1t\u00e9","family":"Hety\u00e9sy","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krisztina","family":"Bali","sequence":"additional","affiliation":[{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"Department of Microbiology and Infectious Diseases, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Levente","family":"Moln\u00e1r","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szonja Petra","family":"Kiss","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c1kos","family":"Jerzsele","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eszter","family":"Kaszab","sequence":"additional","affiliation":[{"name":"National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"Department of Microbiology and Infectious Diseases, University of Veterinary Medicine Budapest","place":["Budapest, Hungary"]},{"name":"Department of Bioinformatics, One Health Institute, Faculty of Health Sciences, University of Debrecen","place":["Debrecen, Hungary"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,10,2]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"524","DOI":"10.1016\/j.tim.2015.06.005","article-title":"Tackling antimicrobial resistance at global and local scales","volume":"23","author":"Gelband","year":"2015","journal-title":"Trends Microbiol"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"344","DOI":"10.3390\/microorganisms11020344","article-title":"The diversity of Escherichia coli Pathotypes and vaccination strategies against this versatile bacterial pathogen","volume":"11","author":"Pokharel","year":"2023","journal-title":"Microorganisms"},{"key":"ref3","doi-asserted-by":"publisher","first-page":"141","DOI":"10.1016\/j.vetmic.2013.10.008","article-title":"Occurrence of weak mutators among avian pathogenic Escherichia coli 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