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- W2122023110 endingPage "3318" @default.
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- W2122023110 abstract "Erythromycin-resistant isolates of Streptococcus pneumoniae from blood cultures and noninvasive sites were studied over a 3-year period. The prevalence of erythromycin resistance was 11.9% (19 of 160) in blood culture isolates but 4.2% (60 of 1,435) in noninvasive-site isolates. Sixty-two of the 79 resistant isolates were available for study. The M phenotype was responsible for 76% (47 of 62) of resistance, largely due to a serotype 14 clone, characterized by multilocus sequence typing as ST9, which accounted for 79% (37 of 47) of M phenotype resistance. The ST9 clone was 4.8 times more common in blood than in noninvasive sites. All M phenotype isolates were PCR positive for mef(A), but sequencing revealed that the ST9 clone possessed the mef(A) sequence commonly associated with Streptococcus pyogenes. All M phenotype isolates with this mef(A) sequence also had sequences consistent with the presence of the Tn1207.1 genetic element inserted in the celB gene. In contrast, isolates with the mef(E) sequence normally associated with S. pneumoniae contained sequences consistent with the presence of the mega insertion element. All MLS(B) isolates carried erm(B), and two isolates carried both erm(B) and mef(E). Fourteen of the 15 MLS(B) isolates were tetracycline resistant and contained tet(M). However, six M phenotype isolates of serotypes 19 (two isolates) and 23 (four isolates) were also tetracycline resistant and contained tet(M). MICs for isolates with the mef(A) sequence were significantly higher than MICs for isolates with the mef(E) sequence (P < 0.001). Thus, the ST9 clone of S. pneumoniae is a significant cause of invasive pneumococcal disease in northeast Scotland and is the single most important contributor to M phenotype erythromycin resistance." @default.
- W2122023110 created "2016-06-24" @default.
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- W2122023110 date "2002-09-01" @default.
- W2122023110 modified "2023-09-26" @default.
- W2122023110 title "Molecular Epidemiology of Erythromycin Resistance in <i>Streptococcus pneumoniae</i> Isolates from Blood and Noninvasive Sites" @default.
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- W2122023110 doi "https://doi.org/10.1128/jcm.40.9.3313-3318.2002" @default.
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