Bacterial adhesion to catheter surfaces

Bacterial adhesion to catheter surfaces represents the foundational event in the pathogenesis of medical device-related infections, such as catheter-associated urinary tract infections (CAUTI) and central line-associated bloodstream infections (CLABSI) (Trautner & Darouiche, 2004, PMID: 15528054). This multi-stage process begins with the conditioning of the catheter surface by host proteins (e.g., fibrinogen, fibronectin), followed by the docking of bacterial cells via non-specific physical forces and specific molecular interactions involving bacterial adhesins like Microbial Surface Components Recognizing Adhesive Matrix Molecules (MSCRAMMs) (Bhattacharya et al., 2015, PMID: 25852853). Once bacteria transition from reversible to irreversible attachment, they initiate the production of an extracellular polymeric substance (EPS) matrix, culminating in the formation of a mature biofilm (Donlan, 2001, PMID: 11559231). Biofilms provide a protective niche that shields pathogens from host immune responses and increases their tolerance to conventional antibiotics by up to 1000-fold. Consequently, therapeutic interventions are largely preventative, utilizing antimicrobial-impregnated coatings (e.g., silver, minocycline/rifampin) or anti-adhesive surface modifications to inhibit the initial colonization phase (Stickler, 2008, PMID: 18230304). These strategies aim to disrupt the interaction between the microbe and the catheter surface before a stable community can be established.

Other names

Catheter colonizationBiofilm formation on medical devicesMicrobial attachment to cathetersBacterial surface attachment

Prevention of microbial colonization through the release of bactericidal agents from the catheter surface or the creation of a physical/chemical barrier that inhibits bacterial attachment and subsequent biofilm maturation.