Reduced levofloxacin susceptibility in clinical respiratory isolates of Haemophilus influenzae is not yet associated with mutations in the DNA gyrase and topoisomerase II genes in Korea.

Abstract excerpt

Among 155 clinical respiratory isolates of Haemophilus influenzae in Korea, 6 (3.9%) isolates had reduced levofloxacin susceptibility (MICs ≥ 0.5 μg/mL). These six isolates had no significant quinolone resistance-determining region (QRDR) mutations in gyrA, gyrB, parC, or parE. This phenomenon suggests that neither evolution nor spread of any significant QRDRs mutations in clinical isolates occurred in Korea....

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