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We analyzed 384\n            <jats:italic>S.<\/jats:italic>\n            Newport isolates from various sources by a multilocus sequence typing (MLST) scheme to study the evolution and population structure of the serovar. These were compared to the population structure of\n            <jats:italic>S. enterica<\/jats:italic>\n            serovars Enteritidis, Kentucky, Paratyphi B, and Typhimurium. Our\n            <jats:italic>S.<\/jats:italic>\n            Newport collection fell into three lineages, Newport-I, Newport-II, and Newport-III, each of which contained multiple sequence types (STs). Newport-I has only a few STs, unlike Newport-II or Newport-III, and has possibly emerged recently. Newport-I is more prevalent among humans in Europe than in North America, whereas Newport-II is preferentially associated with animals. Two STs of Newport-II encompassed all MDR-AmpC isolates, suggesting recent global spread after the acquisition of the\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>CMY-2<\/jats:sub>\n            gene. In contrast, most Newport-III isolates were from humans in North America and were pansusceptible to antibiotics. Newport was intermediate in population structure to the other serovars, which varied from a single monophyletic lineage in\n            <jats:italic>S.<\/jats:italic>\n            Enteritidis or\n            <jats:italic>S.<\/jats:italic>\n            Typhimurium to four discrete lineages within\n            <jats:italic>S.<\/jats:italic>\n            Paratyphi B. Both mutation and homologous recombination are responsible for diversification within each of these lineages, but the relative frequencies differed with the lineage. We conclude that serovars of\n            <jats:italic>S. enterica<\/jats:italic>\n            provide a variety of different population structures.\n          <\/jats:p>","DOI":"10.1128\/jb.00969-10","type":"journal-article","created":{"date-parts":[[2010,10,9]],"date-time":"2010-10-09T01:12:07Z","timestamp":1286586727000},"page":"6465-6476","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":116,"title":["Evolution and Population Structure of\n            <i>Salmonella enterica<\/i>\n            Serovar Newport"],"prefix":"10.1128","volume":"192","author":[{"given":"Vartul","family":"Sangal","sequence":"first","affiliation":[{"name":"Department of Molecular Biology, Max Planck Institute for Infection Biology, Chariteplatz 1, D-10117 Berlin, Germany"},{"name":"Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heather","family":"Harbottle","sequence":"additional","affiliation":[{"name":"Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland 20708"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Camila J.","family":"Mazzoni","sequence":"additional","affiliation":[{"name":"Department of Molecular Biology, Max Planck Institute for Infection Biology, Chariteplatz 1, D-10117 Berlin, Germany"},{"name":"Environmental Research Institute and Department of Microbiology, University College Cork, Cork, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reiner","family":"Helmuth","sequence":"additional","affiliation":[{"name":"National Salmonella Reference Laboratory, Federal Institute for Risk Assessment (BfR), Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Guerra","sequence":"additional","affiliation":[{"name":"National Salmonella Reference Laboratory, Federal Institute for Risk Assessment (BfR), Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xavier","family":"Didelot","sequence":"additional","affiliation":[{"name":"Department of Statistics, University of Oxford, Oxford OX1 3TG, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bianca","family":"Paglietti","sequence":"additional","affiliation":[{"name":"Department of Biomedical Sciences, University of Sassari, viale San Pietro 43\/b, 07100 Sassari, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wolfgang","family":"Rabsch","sequence":"additional","affiliation":[{"name":"National Reference Centre for Salmonellae and Other Enterics, Robert Koch Institute, Wernigerode, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sylvain","family":"Brisse","sequence":"additional","affiliation":[{"name":"Institut Pasteur, Genotyping of Pathogens and Public Health, 28 rue du Dr Roux, 75724 Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franc\u0327ois-Xavier","family":"Weill","sequence":"additional","affiliation":[{"name":"Institut Pasteur, Unite\u0301 des Bacte\u0301ries Pathoge\u0300nes Ente\u0301riques, Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philippe","family":"Roumagnac","sequence":"additional","affiliation":[{"name":"Department of Molecular Biology, Max Planck Institute for Infection Biology, Chariteplatz 1, D-10117 Berlin, Germany"},{"name":"Centre de Coope\u0301ration International en Recherche Agronomique pour le De\u0301veloppement, UMR BGPI, Campus International de Montferrier-Baillarguet, 34398 Montpellier Cedex-5, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Achtman","sequence":"additional","affiliation":[{"name":"Department of Molecular Biology, Max Planck Institute for Infection Biology, Chariteplatz 1, D-10117 Berlin, Germany"},{"name":"Environmental Research Institute and Department of Microbiology, University College Cork, Cork, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/AEM.01174-06"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1128\/AAC.49.10.4061-4067.2005"},{"key":"e_1_3_2_4_2","doi-asserted-by":"crossref","first-page":"1945","DOI":"10.1016\/j.micinf.2005.12.029","volume":"8","year":"2006","unstructured":"Arlet, G., T. 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