Advances in Clinical and Experimental Medicine

Adv Clin Exp Med
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Advances in Clinical and Experimental Medicine

2016, vol. 25, nr 3, May-June, p. 539–544

doi: 10.17219/acem/34150

Publication type: original article

Language: English

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Creative Commons BY-NC-ND 3.0 Open Access

Distribution of 16S rRNA Methylases Among Different Species of Aminoglycoside-Resistant Enterobacteriaceae in a Tertiary Care Hospital in Poland

Katarzyna Piekarska1,A,D,F, Katarzyna Zacharczuk1,B,C, Tomasz Wołkowicz1,C, Magdalena Rzeczkowska1,C, Elżbieta Bareja2,B, Monika Olak2,B, Rafał Gierczyński1,E,F

1 Department of Bacteriology, National Institute of Public Health-National Institute of Hygiene, Warszawa, Poland

2 Department of Laboratory Diagnostics, Military Institute of Medicine, Warszawa, Poland

Abstract

Background. Aminoglycosides are a group of antimicrobial agents still the most commonly used in the treatment of life-threatening bacterial infections in human and animals. The emergence and spread of 16S rRNA methylases, which confer high-level resistance to the majority of clinically relevant aminoglycosides, constitute a major public health concern.
Objectives. Our goal was to evaluate the distribution of 16S rRNA methylases among different species of Enterobacteriaceae during a five month-long survey in a tertiary hospital in Warszawa, Poland.
Material and Methods. In the survey, a total of 1770 non-duplicate clinical isolates were collected from all hospital wards in a tertiary hospital in Warszawa, Poland. The survey was conducted between 19 April and 19 September 2010. The ability to produce 16S rRNA methylase was examined by determining MICs for gentamicin, kanamycin, amikacin by means of the agar dilution method. The isolates resistant to high concentration of aminoglycosides were PCR tested for genes: armA, rmtA, rmtB and rmtC. PCR products were subjected to DNA sequencing by the Sanger method. The genetic similarity of the ArmA-producing isolates was analysed by pulsed-filed gel electrophoresis (PFGE).
Results. ArmA was the only 16S rRNA methylase detected in 20 of 1770 tested isolates. The overall prevalence rate of ArmA was 1.13%. In K. pneumoniae (n = 742), P. mirabilis (n = 130), and E. cloacae (n = 253) collected in the survey, the prevalence of ArmA was 0.4%, 0.8% and 5.9%, respectively. The PFGE revealed both horizontal and clonal spread of the armA gene in the hospital.
Conclusion. The prevalence of 16S rRNA methylase ArmA reported in this study is significantly higher than observed in other countries in Europe.

Key words

Enterobacteriaceae, 16S rRNA methylases, ArmA

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