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Quantitative analysis of biofilm formed on vascular prostheses by Staphylococcus epidermidis with different ica and
Joanna Golus1, Magdalena Stankevic, Rafal Sawicki
1Department of Biochemistry and Biotechnology, Medical University in Lublin, Lublin - Poland. joanna.golus@umlub.pl
Objectives:
This study aims to examine biofilm formed on vascular prostheses by Staphylococcus epidermidis with different ica and aap genetic status, and to evaluate the effect of antibiotic-modified prostheses on bacterial colonization.
Methods:
Biofilm formation was determined using fluorescence microscopy imaging. Quantitative analysis was conducted using the biofilm coverage ratio (BCR) calculations.
Results:
Our investigations prove that the BCR method with fluorescent dye enabled an accurate assessment of biofilm coverage and comparison of the obtained results. The ica+ aap+ strains formed a biofilm on all of the examined vascular prostheses. Uni-Graft(®) modified with covalently immobilized amikacin was effective in preventing bacterial adherence.
Conclusions:
Molecular biology techniques combined with phenotype studies give a broad insight into biofilm formation mechanisms. On the other hand, fluorescence microscopy imaging along with BCR calculations are reliable and simple tools to quantitatively estimate biofilm formation, as well as the effectiveness of antimicrobial prosthesis modification.
