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We performed an experimental study investigating carriage time and interindividual transmission of extended spectrum beta\u2010lactamase\u2010 (ESBL\u2010)producing\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Escherichia coli<\/jats:italic>\n                    <\/jats:styled-content>\n                    in Mallards (\n                    <jats:italic>\n                      <jats:styled-content style=\"fixed-case\">Anas platyrhynchos<\/jats:styled-content>\n                      )\n                    <\/jats:italic>\n                    to assess if the birds carry the bacteria long enough to transfer them geographically during migration. Mallards were inoculated intraoesophageally with four different strains of ESBL\u2010producing\n                    <jats:italic>E. coli<\/jats:italic>\n                    and kept together in a flock. The ESBL\u2010strains belonged to sequence types previously shown to spread between birds and humans. Culturing from faecal samples showed presence of ESBL\u2010producing\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>E. coli<\/jats:italic>\n                    <\/jats:styled-content>\n                    the entire 29 day experimental period. An extensive and rapid transmission of the different ESBL\u2010strains between individuals (including non\u2010inoculated controls) was observed. In necropsy samples, we detected ESBL\u2010strains in the cecum even in faeces\u2010negative birds, indicating that this part of the intestine could function as a reservoir of resistant bacteria. We demonstrate that birds can carry ESBL\u2010producing\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>E. coli<\/jats:italic>\n                    <\/jats:styled-content>\n                    for long enough times to travel far during migration and the extensive interindividual transmission suggests spread between individuals in a dense bird population as a mechanism that allow persistence of resistant bacteria.\n                  <\/jats:p>","DOI":"10.1111\/1758-2229.12681","type":"journal-article","created":{"date-parts":[[2018,7,24]],"date-time":"2018-07-24T23:54:45Z","timestamp":1532476485000},"page":"576-582","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Long\u2010term carriage and rapid transmission of extended spectrum beta\u2010lactamase\u2010producing\n                    <scp>\n                      <i>E. coli<\/i>\n                    <\/scp>\n      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