title: Differences in Bacterial Colonization and Biofilm Formation Property of Uropathogens between the Two most Commonly used Indwelling Urinary Catheters.
abstract: BACKGROUND
  Catheter Associated Urinary Tract Infections (CAUTI) are one of the most common cause of nosocomial infections. Many bacterial species show biofilm production, which provides survival benefit to them by providing protection from environmental stresses and causing decreased susceptibility to antimicrobial agents. Two most common types of catheters used in our setup are pure silicone catheter and silicone coated latex catheter. The advantage of pure silicone catheter for long term catheterization is well established. But there is still a controversy about any advantage of the silicone catheter regarding bacterial colonization rates and their biofilm production property.
  
  
  OBJECTIVE
  The aim of our study was to compare the bacterial colonization and the biofilm formation property of the colonizing bacteria in patients with indwelling pure silicone and silicone coated latex catheters.
  
  
  METHODS
  This prospective observational study was conducted in the Urology Department of our institute. Patients who needed catheterization for more than 5 days during the period July 2015 to January 2016 and had sterile precatheterisation urine were included in the study. Patients were grouped into 2 groups of 50 patients each, Group A with the pure silicone catheter and Group B with the silicone coated latex catheter. Urine culture was done on the 6(th) day of indwelling urinary catheter drainage. If growth was detected, then that bacterium was tested for biofilm production property by tissue culture plate method.
  
  
  METHODS
  Statistical analyses were performed using the Statistical Package for the Social Science Version 22 (SPSS-22).
  
  
  RESULTS
  After 5 days of indwelling catheterization, the pure silicone catheter had significantly less bacterial colonization than the silicone coated latex catheter (p-value=0.03) and the biofilm forming property of colonizing bacteria was also significantly less in the pure silicone catheter as compared to the silicone coated latex catheter (p-value=0.02). There were no significant differences in the colonizing bacteria in the 2 groups. In both the groups the most common bacteria were Escherichia coli.
  
  
  CONCLUSIONS
  The pure silicone catheter is advantageous over the silicone coated latex catheter in terms of incidence of bacterial colonization as well as the biofilm formation and hence in the management of CAUTI.
authors: Resident, Department of Urology, SMS Medical College , Jaipur, Rajasthan, India .
authors: Amit
authors: A
authors: Verma
authors: Resident, Department of Microbiology, SMS Medical College , Jaipur, Rajasthan, India .
authors: Deepa
authors: D
authors: Bhani
authors: Professor and Head, Department of Urology, SMS Medical College , Jaipur, Rajasthan, India .
authors: Vinay
authors: V
authors: Tomar
authors: Professor, Department of Microbiology, SMS Medical College , Jaipur, Rajasthan, India .
authors: Rekha
authors: R
authors: Bachhiwal
authors: Professor, Department of Urology, SMS Medical College , Jaipur, Rajasthan, India .
authors: Shersingh
authors: S
authors: Yadav
keywords: Catheter Associated Urinary Tract Infections; Pure silicone catheter; Silicone coated latex catheter