Molecular characterization of quinolone resistance-determining regions and their correlation with serotypes and genotypes among Streptococcus pneumoniae isolates in Japan.

Abstract excerpt

We established the distribution of amino acid alterations in quinolone resistance-determining regions (QRDRs) of Streptococcus pneumoniae isolates in Japan and described the correlation of these alterations with serotypes determined by multilocus sequencing typing. Among 141 S. pneumoniae isolates, five levofloxacin-resistant isolates harbored mutations in both gyrA and parC and/or parE and were clonally...

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