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Various NTS serovars may be present in apparently healthy animals. This could result in carcass contamination during the slaughter process leading to human exposure. While most genomic research has focused on <jats:italic>Salmonella<\/jats:italic> pathogenesis, little is known on the factors associated with subclinical infections and environmental persistence. We report here the widespread distribution of typhoidal toxin genes (i. e. the <jats:italic>cdtB<\/jats:italic> islet, <jats:italic>hlyE<\/jats:italic>, <jats:italic>taiA<\/jats:italic>), among NTS strains from a beef slaughter operation (n\u2009=\u200939) and from epidemiologically unconnected ground beef (n\u2009=\u200920). These genes were present in 76% of the strains, regardless of serovar, isolation source or geographical location. Moreover, strains that predominated in the slaughterhouse carry plasmid-borne type IV secretion systems (T4SS), which have been linked to persistent infections in numerous pathogens. Population genomics supports clonal dissemination of NTS along the food production chain, highlighting its role as reservoir of genetic variability in the environment. Overall, the study provides a thorough characterization of serovar diversity and genomic features of beef-associated NTS in Mexico. Furthermore, it reveals how common genetic factors could partially explain the emergence and persistence of certain NTS serovars in the beef industry.<\/jats:p>","DOI":"10.1038\/s41598-018-28169-4","type":"journal-article","created":{"date-parts":[[2018,6,25]],"date-time":"2018-06-25T11:55:46Z","timestamp":1529927746000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Whole genome sequencing reveals widespread distribution of typhoidal toxin genes and VirB\/D4 plasmids in bovine-associated nontyphoidal Salmonella"],"prefix":"10.1038","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5380-8095","authenticated-orcid":false,"given":"Enrique Jes\u00fas","family":"Delgado-Su\u00e1rez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nelly","family":"Selem-Mojica","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roc\u00edo","family":"Ortiz-L\u00f3pez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wondwossen A.","family":"Gebreyes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc W.","family":"Allard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1492-9497","authenticated-orcid":false,"given":"Francisco","family":"Barona-G\u00f3mez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Salud","family":"Rubio-Lozano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,6,29]]},"reference":[{"key":"28169_CR1","unstructured":"Organizaci\u00f3n Mundial de la Salud. 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