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High Genetic Diversity of Ciprofloxacin-Nonsusceptible Isolates of Streptococcus pneumoniae in Poland

Ewa Sadowy,^* Radosaw Izdebski, Anna Skoczyska, Marek Gniadkowski, and Waleria Hryniewicz

National Institute of Public Health, Chemska 30/34, 00-725 Warsaw, Poland

Received 18 November 2004/ Returned for modification 24 December 2004/ Accepted 27 January 2005

We have analyzed the susceptibility to ciprofloxacin of 697 pneumococcal isolates collected in 1998-2002 in Poland from patients with respiratory tract diseases. Thirty-one ciprofloxacin-nonsusceptible isolates (MICs, 4 µg/ml) were identified, of which two were resistant to levofloxacin (MIC, 8 µg/ml). Serotyping, pulsed-field gel electrophoresis, multilocus sequence typing, and the analysis of resistance determinants showed their great genetic diversity.

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