Efficacy of Poloxamer-Based Wound Dressings on Biofilms.

This study evaluated the antimicrobial and antibiofilm activity of a concentrated surfactant gel preserved with antimicrobials and a concentrated surfactant gel with 1% silver sulfadiazine (SSD) against 12 clinical strains of and the type strain ATCC 19606. The biofilm-forming potential of the isolates was investigated using a crystal violet assay and classifying the isolates as "non-adherent," "weak," "moderate," or "strong" biofilm formers. The antimicrobial activity was determined using the zone of inhibition (ZOI) method. The antibiofilm activity was evaluated against ATCC 19606 using the Center for Disease Control bioreactor model. readily forms biofilms with 8 out of the 12 clinical isolates being classified as strong biofilm formers (OD > 0.4). The concentrated surfactant gel with 1% SSD demonstrated antimicrobial activity against all isolates with a ZOI of 7.2-14 mm. Antibiofilm activity against a 24 h biofilm of ATCC 19606 was found, with a ≥7 log decrease in bacterial cell density following 24 h treatment with the concentrated surfactant gel with 1% SSD. The concentrated surfactant gel preserved with antimicrobials also showed some biofilm disruption with ∼3 log decrease in bacterial cell density being found. The concentrated surfactant gel with 1% SSD used in this study showed antimicrobial and antibiofilm activity against . The concentrated surfactant gel with 1% SSD used in this study showed efficacy against , a common cause of wound infections, and should be considered for treatment of wounds infected with in health care settings.