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Increase in fluoroquinolone non-susceptibility among clinical **Streptococcus pyogenes** in Belgium during 2007-10
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| Objectives To study the temporal evolution of fluoroquinolone non-susceptibility among Streptococcus pyogenes during 200710 in Belgium. Methods S. pyogenes (n = 4690) recovered from patients with tonsillopharyngitis or skin, wound or invasive infections were screened for fluoroquinolone non-susceptibility. A selection of fluoroquinolone-non-susceptible strains was investigated for resistance mechanisms: reserpine-sensitive efflux and mutations in topoisomerase genes parC and gyrA. Clonality was determined by emm typing. Results Fluoroquinolone non-susceptibility (ciprofloxacin MIC ≥2 mg/L) was identified in 535 (11.4%) of 4690 S. pyogenes recovered during 200710 in Belgium. The proportion of fluoroquinolone-non-susceptible S. pyogenes increased significantly from 4.3% (2008) to 10.9% (2009) to 21.6% (2010) and coincided with a significant increase in emm6 strains among fluoroquinolone-non-susceptible S. pyogenes. Ciprofloxacin MICs of 28 mg/L correlated with first-step ParC substitutions. Two high-level fluoroquinolone-resistant S. pyogenes strains (ciprofloxacin MICs 32 mg/L) showed second-step substitutions in GyrA (Ser-81→Phe or Tyr) in addition to first-step mutations in parC. Reserpine-sensitive efflux was not observed. Conclusions We report an unprecedented increase in fluoroquinolone-non-susceptible S. pyogenes in Belgium, a country with high quinolone use, as well as emergence of two high-level fluoroquinolone-resistant S. pyogenes strains with second-step mutations in gyrA, warning us of the need for more prudent use of fluoroquinolones and for continued resistance surveillance. | |
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English
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The journal of antimicrobial chemotherapy. - London, 1975, currens |
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London : 2012
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0305-7453 [print]
1460-2091 [online]
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67:11(2012), p. 2602-2605
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000309923800007
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