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Biofilm formation by five species of Candida on three clinical materials.

Most recalcitrant infections are associated with colonization and microbial biofilm development. These biofilms are difficult to eliminate by the immune response mechanisms and the current antimicrobial. Fungi can form biofilms on biomaterials commonly used in clinical practice (intravascular catheters, dentures, heart valves, implanted devices, contact lenses and other devices) and are associated with infections. A variety of in vitro models using different substrates/devices have been described. These models have been used to investigate the effect of different variables, including flow, growth time, nutrients and physiological conditions on fungal biofilm formation, morphology and architecture. The purpose of our study is to analyze biofilm formation capacity by 84 strains of Candida spp. (23C. albicans, 23C. parapsilosis, 16C. tropicalis, 17C. glabrata and 5C. krusei) on three materials used in medical devices and its quantification using a method based on viable cell count. Under the conditions of our study, all assayed Candida strains have been able to form biofilms. All species showed greater biofilm formation capacity on Teflon™, with the exception of C. glabrata which displayed higher biofilm formation capacity on PVC. Biofilm formation by Candida spp. varies depending on the type of material on which it grows and on the species and strain of Candida. The method we propose could be of great use to deepen scientific knowledge on this subject of remarkable clinical significance, considering the absence of standard biofilm formation and quantification techniques on the catheters and the level of difficulty associated to those available.

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