{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T13:46:55Z","timestamp":1762004815034,"version":"3.41.0"},"reference-count":43,"publisher":"American Society for Microbiology","issue":"11","license":[{"start":{"date-parts":[[2016,11,1]],"date-time":"2016-11-01T00:00:00Z","timestamp":1477958400000},"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":[[2016,11]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Antimicrobial-resistant pneumococcal strains have been detected worldwide since the 1960s. In Brazil, the first penicillin-nonsusceptible pneumococci (PNSP) were reported in the 1980s, and their emergence and dissemination have been mainly attributed to serogroup 9 and serotype 14 strains, especially those highly related to recognized international clones. In the present study, antimicrobial susceptibility testing and multilocus sequence typing were performed on 315 pneumococcal isolates belonging to serogroup 9 (<jats:italic>n<\/jats:italic>= 99) or serotype 14 (<jats:italic>n<\/jats:italic>= 216), recovered from patients or asymptomatic carriers between 1988 and 2011 in Brazil, in order to trace changes in antimicrobial resistance and genotypes prior to the full introduction of the pneumococcal conjugate vaccine in the country. Over the 23-year study period, the PNSP levels increased, and four clonal complexes (CC156, CC66, CC15, and CC5401) have played important roles in the evolution and dissemination of pneumococcal isolates belonging to serogroup 9 and serotype 14, as well as in the emergence of antimicrobial resistance, in the pre-pneumococcal-vaccination era. The earliest PNSP strains detected in this study belonged to serotype 9N\/ST66 and were single locus variants of the international clone Tennessee<jats:sup>14<\/jats:sup>-18 ST67 (CC66). The first serotype 14 PNSP isolates were identified in 1990 and were related to the England<jats:sup>14<\/jats:sup>-9 ST9 (CC15) clone. Serotype 14 PNSP variants of the Spain<jats:sup>9V<\/jats:sup>-3 ST156 clone with elevated penicillin MICs and nonsusceptibility to other beta-lactams were detected in 1995 and showed an increasing trend over the years. The results also indicated that introduction of ST156 in our region was preceded by the emergence of trimethoprim-sulfamethoxazole resistance and by the dissemination of ST162. In addition to the presence of successful international clones, a novel regional serotype 14 genotype (CC5401) has emerged in 1996.<\/jats:p>","DOI":"10.1128\/aac.00673-16","type":"journal-article","created":{"date-parts":[[2016,8,30]],"date-time":"2016-08-30T02:03:38Z","timestamp":1472522618000},"page":"6664-6672","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Streptococcus pneumoniae Serotypes 9 and 14 Circulating in Brazil over a 23-Year Period Prior to Introduction of the 10-Valent Pneumococcal Conjugate Vaccine: Role of International Clones in the Evolution of Antimicrobial Resistance and Description of a Novel Genotype"],"prefix":"10.1128","volume":"60","author":[{"given":"Tatiana C. 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G.","family":"Dias","sequence":"additional","affiliation":[{"name":"Departamento de Microbiologia e Parasitologia, Universidade Federal de Ci\u00eancias da Sa\u00fade de Porto Alegre, Porto Alegre, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rosana R.","family":"Barros","sequence":"additional","affiliation":[{"name":"Instituto Biom\u00e9dico, Universidade Federal Fluminense, Niter\u00f3i, Rio de Janeiro, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9 M.","family":"Peralta","sequence":"additional","affiliation":[{"name":"Instituto de Microbiologia Paulo de Goes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V\u00e2nia L. 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