The Common Urinary Tract Infection

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Bacterial urinary tract infections represent the most common type of nosocomial infections. Often, the ability of bacteria to both establish and maintain these infections are directly related to biofilm formation on indwelling devices or within the urinary tract itself (30). Enterococci (especially E. faecalis) are one of the main causative agents of urinary tract infection and Catheter-associated urinary tract infections (CAUTIs) besides gram-negative pathogens (31, 32). In these infections Biofilm provides a favorable milieu for microbial survival within the host as the organisms are shielded from the host immune response, as well as antibiotics and antimicrobial agents (33, 34). Several studies conducted to introduce main virulence genes of enterococci that are associated with biofilm formation in these bacteria (11, 13,-17), but virulence mechanism and related genes for biofilm formation are not well understood (35). In this study we investigated biofilm formation of clinical enterococci isolates isolated from Urinary tract infections. These strains were characterized for presence of adhesions and secretory virulence factors. Isolates had diverse presence of virulence from lack to highest amount of virulence genes. Several previous studies investigated relation of virulence genes and biofilm formation, especially presence of esp and gel. Enterococci esp has been implicated as a contributing factor in colonization and persistence of infection within the urinary tract
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