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| | Emerging Infectious Diseases: Clonal Differences among Erythromycin. Resistan... @ HighBeam Research (Site not responding. Last check: 2007-10-18) |
 | | A report of ErR in Gipuzkoa from 1984 to 1996 (11) showed that until the end of 1990, erythromycin resistance in S. pyogenes was low (1.2%, 13 of 1,060); after 1990, resistance increased, reaching 34.8% (87 of 250) of all S. pyogenes isolated in 1995. |
 | | Among the ErR strains isolated in Gipuzkoa, two phenotypes of resistance were found: 8 (2.6%) strains showed the classic [MLS.sub.b] phenotype, while the other 301 (97.4%) strains expressed the M phenotype, as shown by susceptibility testing and confirmed by the presence of the mefA gene (11). |
 | | In Gipuzkoa, the first serotype T4 ErR strain was isolated in 1991; until the end of 1994, 93.8% of ErR isolated belonged to the same clone (clone B: biotype I, type T4, emm4, PFGE II). |
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