{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T00:18:18Z","timestamp":1788481098682,"version":"build-2803163510"},"reference-count":42,"publisher":"American Society for Microbiology","issue":"9","license":[{"start":{"date-parts":[[2007,9,1]],"date-time":"2007-09-01T00:00:00Z","timestamp":1188604800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Antimicrob Agents Chemother"],"published-print":{"date-parts":[[2007,9]]},"abstract":"ABSTRACT<\/jats:title>\n \n Tigecycline, a member of the glycylcycline class of antibiotics, was designed to maintain the antibacterial spectrum of the tetracyclines while overcoming the classic mechanisms of tetracycline resistance. The current study was designed to monitor the prevalence of the\n tet<\/jats:italic>\n (A),\n tet<\/jats:italic>\n (B),\n tet<\/jats:italic>\n (C),\n tet<\/jats:italic>\n (D),\n tet<\/jats:italic>\n (E), and\n tet<\/jats:italic>\n (M) resistance determinants in\n Escherichia coli<\/jats:italic>\n isolates collected during the worldwide tigecycline phase 3 clinical trials. A subset of strains were also screened for the\n tet<\/jats:italic>\n (G),\n tet<\/jats:italic>\n (K),\n tet<\/jats:italic>\n (L), and\n tet<\/jats:italic>\n (Y) genes. Of the 1,680\n E. coli<\/jats:italic>\n clinical isolates screened for resistance to classical tetracyclines, 405 (24%) were minocycline resistant (MIC \u2265 8 \u03bcg\/ml) and 248 (15%) were tetracycline resistant (MIC \u2265 8 \u03bcg\/ml) but susceptible to minocycline (MIC \u2264 4 \u03bcg\/ml). A total of 452 tetracycline-resistant, nonduplicate isolates were positive by PCR for at least one of the six tetracycline resistance determinants examined. Over half of the isolates encoding a single determinant were positive for\n tet<\/jats:italic>\n (A) (26%) or\n tet<\/jats:italic>\n (B) (32%) with\n tet<\/jats:italic>\n (C),\n tet<\/jats:italic>\n (D),\n tet<\/jats:italic>\n (E), and\n tet<\/jats:italic>\n (M), collectively, found in 4% of isolates. Approximately 33% of the isolates were positive for more than one resistance determinant, with the\n tet<\/jats:italic>\n (B) plus\n tet<\/jats:italic>\n (E) combination the most highly represented, found in 11% of isolates. The susceptibilities of the tetracycline-resistant strains to tigecycline (MIC\n 90<\/jats:sub>\n , 0.5 \u03bcg\/ml), regardless of the encoded\n tet<\/jats:italic>\n determinant(s), were comparable to the tigecycline susceptibility of tetracycline-susceptible strains (MIC\n 90<\/jats:sub>\n , 0.5 \u03bcg\/ml). The results provide a current (2002 to 2006) picture of the distribution of common tetracycline resistance determinants encoded in a globally sourced collection of clinical\n E. coli<\/jats:italic>\n strains.\n <\/jats:p>","DOI":"10.1128\/aac.00625-07","type":"journal-article","created":{"date-parts":[[2007,7,9]],"date-time":"2007-07-09T20:43:33Z","timestamp":1184013813000},"page":"3205-3211","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":75,"title":["Occurrence of Tetracycline Resistance Genes among\n Escherichia coli<\/i>\n Isolates from the Phase 3 Clinical Trials for Tigecycline"],"prefix":"10.1128","volume":"51","author":[{"given":"Margareta","family":"Tuckman","sequence":"first","affiliation":[{"name":"Infectious Diseases Discovery Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter J.","family":"Petersen","sequence":"additional","affiliation":[{"name":"Infectious Diseases Discovery Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anita Y. 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