{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,9]],"date-time":"2025-09-09T21:17:23Z","timestamp":1757452643705},"reference-count":35,"publisher":"American Society for Microbiology","issue":"7","license":[{"start":{"date-parts":[[2003,7,1]],"date-time":"2003-07-01T00:00:00Z","timestamp":1057017600000},"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":["J Clin Microbiol"],"published-print":{"date-parts":[[2003,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n          <jats:p>\n            Twenty-nine penicillin-susceptible serotype 6B strains isolated from patients with invasive diseases and from healthy carriers were examined by different genotyping methods. Ten groups were identified on the basis of the pulsed-field gel electrophoresis (PFGE) profiles, and two of these contained multiple isolates and were analyzed further. PFGE group 1 comprised 12 isolates, the majority of which had a multiresistant phenotype (resistance to erythromycin, clindamycin, tetracycline, chloramphenicol, and trimethoprim-sulfamethoxazole), corresponding to that of a clone previously described in the Mediterranean area and related to penicillin-resistant clone Spain\n            <jats:sup>6B<\/jats:sup>\n            -2. The\n            <jats:italic>pbp2b<\/jats:italic>\n            ,\n            <jats:italic>pbp2x<\/jats:italic>\n            ,\n            <jats:italic>dhf<\/jats:italic>\n            , and\n            <jats:italic>pspA<\/jats:italic>\n            genes of the isolates had identical restriction profiles; and the partial sequence of\n            <jats:italic>pspA<\/jats:italic>\n            was identical to that of clone Spain\n            <jats:sup>6B<\/jats:sup>\n            -2. In all isolates the resistance determinants\n            <jats:italic>erm<\/jats:italic>\n            (B) and\n            <jats:italic>tet<\/jats:italic>\n            (M) were inserted in a Tn\n            <jats:italic>1545<\/jats:italic>\n            -like element; 11 isolates carried\n            <jats:italic>cat<\/jats:italic>\n            as part of the integrated plasmid pC194. Multilocus sequence typing (MLST) performed with two isolates confirmed that their profiles corresponded to that of the Mediterranean clone. PFGE group 2 comprised nine strains, of which the majority showed no antibiotic resistance. Their\n            <jats:italic>pspA<\/jats:italic>\n            profiles were different, and the partial sequences obtained for two representative isolates indicated the presence of PspA proteins of different clades. The MLST profile of one strain was identical to that of a serotype 6B strain from the United Kingdom, while two other isolates were novel one-allele variants. This clone appears to be related (five of seven identical alleles) to two other internationally disseminated clones, Hungary\n            <jats:sup>19A<\/jats:sup>\n            -6 and Poland\n            <jats:sup>23F<\/jats:sup>\n            -16, both of which are penicillin resistant. The presence of antibiotic-susceptible isolates of this clone suggests that traits other than antibiotic resistance can make a clone successful.\n          <\/jats:p>","DOI":"10.1128\/jcm.41.7.2855-2861.2003","type":"journal-article","created":{"date-parts":[[2003,7,3]],"date-time":"2003-07-03T19:05:48Z","timestamp":1057259148000},"page":"2855-2861","update-policy":"http:\/\/dx.doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":11,"title":["Phenotypic and Genotypic Characterization of Two Penicillin-Susceptible Serotype 6B\n            <i>Streptococcus pneumoniae<\/i>\n            Clones Circulating in Italy"],"prefix":"10.1128","volume":"41","author":[{"given":"Giovanni","family":"Gherardi","sequence":"first","affiliation":[{"name":"Dipartimento di Medicina di Laboratorio e Microbiologia, Universita\u0300 Campus Biomedico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria","family":"Del Grosso","sequence":"additional","affiliation":[{"name":"Laboratorio di Batteriologia e Micologia Medica, Istituto Superiore di Sanita\u0300, Rome, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Scotto d'Abusco","sequence":"additional","affiliation":[{"name":"Laboratorio di Batteriologia e Micologia Medica, Istituto Superiore di Sanita\u0300, Rome, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fabio","family":"D'Ambrosio","sequence":"additional","affiliation":[{"name":"Laboratorio di Batteriologia e Micologia Medica, Istituto Superiore di Sanita\u0300, Rome, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giordano","family":"Dicuonzo","sequence":"additional","affiliation":[{"name":"Dipartimento di Medicina di Laboratorio e Microbiologia, Universita\u0300 Campus Biomedico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Annalisa","family":"Pantosti","sequence":"additional","affiliation":[{"name":"Laboratorio di Batteriologia e Micologia Medica, Istituto Superiore di Sanita\u0300, Rome, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/jb.173.5.1617-1622.1991"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.38.10.3663-3669.2000"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/0147-619X(87)90009-6"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0966-842X(00)88930-1"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.40.3.774-778.2002"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.40.10.3660-3665.2002"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1099\/00221287-144-11-3049"},{"key":"e_1_3_2_9_2","unstructured":"European Antimicrobial Resistance Surveillance System. 2003. 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