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This study was designed to identify, at the sequence level, the genes responsible for the extended-spectrum-\u03b2-lactamase (ESBL) phenotypes of\n            <jats:italic>Escherichia coli, Klebsiella pneumoniae<\/jats:italic>\n            , and\n            <jats:italic>Proteus mirabilis<\/jats:italic>\n            isolates collected during the global tigecycline phase 3 clinical trials. PCR assays were developed to identify and clone the\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>TEM<\/jats:sub>\n            ,\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>SHV<\/jats:sub>\n            ,\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>OXA<\/jats:sub>\n            , and\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>CTX<\/jats:sub>\n            genes from clinical strains. Isolates were also screened for AmpC genes of the\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>CMY<\/jats:sub>\n            ,\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>ACT<\/jats:sub>\n            ,\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>FOX<\/jats:sub>\n            , and\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>DHA<\/jats:sub>\n            families as well as the\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>KPC<\/jats:sub>\n            genes encoding class A carbapenemases.\n            <jats:italic>E. coli, K. pneumoniae<\/jats:italic>\n            , and\n            <jats:italic>P. mirabilis<\/jats:italic>\n            isolates with ceftazidime MICs of \u22652 \u03bcg\/ml were designated possible ESBL-producing pathogens and were then subjected to a confirmatory test for ESBLs by use of Etest. Of 272 unique patient isolates, 239 were confirmed by PCR and sequencing to carry the genes for at least one ESBL, with 44% of the positive isolates harboring the genes for multiple ESBLs. In agreement with current trends for ESBL distribution,\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>CTX-M<\/jats:sub>\n            -type \u03b2-lactamase genes were found in 83% and 71% of the ESBL-positive\n            <jats:italic>E. coli<\/jats:italic>\n            and\n            <jats:italic>K. pneumoniae<\/jats:italic>\n            isolates, respectively, whereas\n            <jats:italic>bla<\/jats:italic>\n            <jats:sub>SHV<\/jats:sub>\n            genes were found in 41% and 28% of the ESBL-positive\n            <jats:italic>K. pneumoniae<\/jats:italic>\n            and\n            <jats:italic>E. coli<\/jats:italic>\n            isolates, respectively. Ninety-seven percent of the\n            <jats:italic>E. coli<\/jats:italic>\n            and\n            <jats:italic>K. pneumoniae<\/jats:italic>\n            isolates were tigecycline susceptible (MIC\n            <jats:sub>90<\/jats:sub>\n            = 2 \u03bcg\/ml), warranting further studies to define the therapeutic utility of tigecycline against strains producing ESBLs in a clinical setting.\n          <\/jats:p>","DOI":"10.1128\/aac.00883-08","type":"journal-article","created":{"date-parts":[[2008,11,18]],"date-time":"2008-11-18T02:26:03Z","timestamp":1226975163000},"page":"465-475","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":47,"title":["Characterization and Sequence Analysis of Extended-Spectrum-\u03b2-Lactamase-Encoding Genes from\n            <i>Escherichia coli, Klebsiella pneumoniae<\/i>\n            , and\n            <i>Proteus mirabilis<\/i>\n            Isolates Collected during Tigecycline Phase 3 Clinical Trials"],"prefix":"10.1128","volume":"53","author":[{"given":"C. Hal","family":"Jones","sequence":"first","affiliation":[{"name":"Infectious Diseases Discovery Research, Wyeth Research, Pearl River, New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Margareta","family":"Tuckman","sequence":"additional","affiliation":[{"name":"Infectious Diseases Discovery Research, Wyeth Research, Pearl River, New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Keeney","sequence":"additional","affiliation":[{"name":"Infectious Diseases Discovery Research, Wyeth Research, Pearl River, New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexey","family":"Ruzin","sequence":"additional","affiliation":[{"name":"Infectious Diseases Discovery Research, Wyeth Research, Pearl River, New York"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patricia A.","family":"Bradford","sequence":"additional","affiliation":[{"name":"Infectious Diseases Discovery Research, Wyeth Research, Pearl River, New York"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1086\/431488"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0732-8893(01)00269-3"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1128\/AAC.48.1.1-14.2004"},{"key":"e_1_3_2_5_2","doi-asserted-by":"crossref","first-page":"219","DOI":"10.2174\/1568012054368100","volume":"4","year":"2005","unstructured":"Bou, G. 2005. 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