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Int. J. Environ. Res. Public Health 2014, 11(5), 4619-4633; doi:10.3390/ijerph110504619

Biofilm Formation and Antimicrobial Susceptibility of Staphylococcus epidermidis Strains from a Hospital Environment

Department and Institute of Microbiology and Virology, School of Pharmacy with the Division of Laboratory Medicine, Medical University of Silesia, ul. Jagiellońska 4, 41-200 Sosnowiec, Poland
Department of Conservative Dentistry with Endodontics, School of Medicine with the Division of Dentistry, Medical University of Silesia, Pl. Akademicki 17, 41-902 Bytom, Poland
Author to whom correspondence should be addressed.
Received: 21 January 2014 / Revised: 8 April 2014 / Accepted: 16 April 2014 / Published: 25 April 2014
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The hospital environment microflora comprise a wide variety of microorganisms which are more or less pathogenic and where staphylococci are one of the most common types. The aim of the presented study was to evaluate the prevalence of the biofilm forming coagulase-negative staphylococci (CoNS) in a hospital environment as a risk factor for nosocomial infections. Among 122 isolated and tested strains of CoNS the most frequent were: S. epidermidis—32 strains, S. haemolyticus—31 strains, S. capitis subsp. capitis 21 strains, S. hominis—11 strains, S. cohnii subsp. cohnii—nine strains. In case of CoNS, the main molecule responsible for intercellular adhesion is a polysaccharide intercellular adhesin (PIA), encoded on the ica gene operon. The analysis revealed the presence of the icaADBC operon genes in 46.88% of S. epidermidis isolates. IcaA and icaD were present in 34.38% and 28.13% of strains respectively while IcaC gene was present in 37.50% of strains. IcaB gene was found in 21.88% of S. epidermidis strains. In 15 (63%) strains all icaADBC operon genes were observed. The assessment of antibacterial drugs susceptibility demonstrated that analyzed CoNS strains were highly resistant to macrolides and lincosamides and more sensitive to rifampicin and linezolid. Our data indicates that the hospital environment can be colonized by biofilm forming coagulase-negative staphylococci and transmission of these strains can cause an increased risk of serious nosocomial infections. View Full-Text
Keywords: biofilm; nosocomial infections; icaADBC operon; Staphylococcus epidermidis biofilm; nosocomial infections; icaADBC operon; Staphylococcus epidermidis

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Wojtyczka, R.D.; Orlewska, K.; Kępa, M.; Idzik, D.; Dziedzic, A.; Mularz, T.; Krawczyk, M.; Miklasińska, M.; Wąsik, T.J. Biofilm Formation and Antimicrobial Susceptibility of Staphylococcus epidermidis Strains from a Hospital Environment. Int. J. Environ. Res. Public Health 2014, 11, 4619-4633.

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