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Biofilm formation, antibiotic susceptibility and RAPD genotypes in Pseudomonas aeruginosa clinical strains isolated from single centre intensive care unit patients

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Abstract

The aim of this study was to analyse genotypes, antimicrobial susceptibility patterns and serotypes in Pseudomonas aeruginosa clinical strains, including the clonal dissemination of particular strains throughout various intensive care units in one medical centre. Using random amplified polymorphic DNA (RAPD–PCR) and P. aeruginosa antisera, 22 different genotypes and 8 serotypes were defined among 103 isolates from 48 patients. No direct association between P. aeruginosa strain genotypes and serotypes was observed. RAPD typing in strains with the same serotype revealed different genotypes and, on the contrary, most strains with a different serotype displayed the same amplification pattern. The resulting banding patterns showed a high degree of genetic heterogeneity among all isolates from the patients examined, suggesting a non-clonal relationship between isolates from these patients. A higher degree of antibiotic resistance and stronger biofilm production in common genotypes compared to rare ones and genetic homogeneity of the most resistant strains indicated the role of antibiotic pressure in acquiring resistant and more virulent strains in our hospital. In conclusion, genetic characterisation of P. aeruginosa strains using RAPD method was shown to be more accurate in epidemiological analyses than phenotyping.

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Authors and Affiliations

  1. Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation, Pekařská 53, 656 91, Brno, Czech Republic

    Martina Vaněrková, Barbora Mališová, Iva Kotásková & Tomáš Freiberger

  2. Department of Clinical Microbiology, Faculty of Medicine, Masaryk University, and St. Anne’s University Hospital, Brno, Czech Republic

    Veronika Holá & Filip Růžička

  3. Department of Clinical Immunology and Allergology, Faculty of Medicine, Masaryk University, and St. Anne’s University Hospital, Brno, Czech Republic

    Tomáš Freiberger

Authors
  1. Martina Vaněrková
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  2. Barbora Mališová
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  3. Iva Kotásková
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  4. Veronika Holá
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  5. Filip Růžička
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  6. Tomáš Freiberger
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Correspondence to Tomáš Freiberger.

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Funding

This work was supported by the grant of Ministry of Health, CZ, [16-31593A], and the internal grant of the Centre for Cardiovascular Surgery and Transplantation Brno, CZ [201404].

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The authors declare that they have no conflict of interest.

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Vaněrková, M., Mališová, B., Kotásková, I. et al. Biofilm formation, antibiotic susceptibility and RAPD genotypes in Pseudomonas aeruginosa clinical strains isolated from single centre intensive care unit patients. Folia Microbiol 62, 531–538 (2017). https://doi.org/10.1007/s12223-017-0526-7

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  • DOI: https://doi.org/10.1007/s12223-017-0526-7

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