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Antimicrobial Agents and Chemotherapy, January 2007, p. 40-47, Vol. 51, No. 1
0066-4804/07/$08.00+0     doi:10.1128/AAC.01072-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Phenotypic and Molecular Analysis of Penicillin-Nonsusceptible Streptococcus pneumoniae Isolates in Poland{triangledown}

Ewa Sadowy,* Radoslaw Izdebski, Anna Skoczynska, Pawel Grzesiowski, Marek Gniadkowski, and Waleria Hryniewicz

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

Received 25 August 2006/ Accepted 3 October 2006

ß-Lactams are the drugs of choice for the treatment of infections caused by the important bacterial pathogen Streptococcus pneumoniae. The recent growth of resistance of this organism to penicillin observed worldwide is of the highest concern. In this study, using 887 surveillance pneumococcal isolates recovered in Poland from 1998 to 2002, we observed the increase in penicillin nonsusceptibility from 8.7% to 20.3%. All of the 109 penicillin-nonsusceptible S. pneumoniae (PNSP) isolates identified, together with 22 archival PNSP isolates from 1995 to 1997, were subsequently analyzed by susceptibility testing, serotyping, profiling of pbp genes, pulsed-field gel electrophoresis, and multilocus sequence typing (MLST). Four predominant serotypes, serotypes 6B, 9V, 14, and 23F, characterized 85.5% of the isolates. MLST revealed the presence of 34 sequence types, 15 of which were novel types. Representatives of seven multiresistant international clones (Spain23F-1, Spain6B-2, Spain9V-3, Taiwan23F-15, Poland23F-16, Poland6B-20, and Sweden15A-25) or their closely related variants comprised the majority of the study isolates. The spread of Spain9V-3 and its related clone of serotype 14/ST143 has remarkably contributed to the recent increase in penicillin resistance in pneumococci in the country.

* Corresponding author. Mailing address: Department of Molecular Microbiology, National Institute of Public Health, Ul. Chelmska 30/34, 00-725 Warsaw, Poland. Phone: 48 22 851 43 88. Fax: 48 22 841 29 49. E-mail: ewasadowy{at}cls.edu.pl.

{triangledown} Published ahead of print on 16 October 2006.

Antimicrobial Agents and Chemotherapy, January 2007, p. 40-47, Vol. 51, No. 1
0066-4804/07/$08.00+0     doi:10.1128/AAC.01072-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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