title: Pharmacodynamics of moxifloxacin versus vancomycin against biofilms of methicillin-resistant Staphylococcus aureus and epidermidis in an in vitro model.
abstract: The aim of this study was to compare the activities of moxifloxacin and vancomycin against methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-resistant Staphylococcus epidermidis (MRSE) biofilms. The study was conducted using a novel in vitro pharmacodynamic model where the biofilms were treated with a simulated clinical dosing of vancomycin 1 g every 12 h or moxifloxacin 400 mg every 24 h. Vancomycin failed to produce a 2 log reduction in the biofilm embedded bacterial count against either of the tested organisms at any time. Moxifloxacin treatment, on the other hand, exhibited a superior anti-biofilm activity and resulted in a 2.5- and 3.7-log reduction in the MRSA and MRSE bacterial bioburdens, respectively, after 24 h of exposure. the results support the implementation of further in vivo and clinical studies aimed at demonstrating the efficacy of moxifloxacin in the treatment of MRSA and MRSE biofilm-associated infections.
authors.affiliation: Department of Experimental and Clinical Pharmacology, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA. sale0074@umn.edu
authors.forename: A H
authors.initials: AH
authors.lastname: Salem
authors.forename: W F
authors.initials: WF
authors.lastname: Elkhatib
authors.forename: G F
authors.initials: GF
authors.lastname: Ahmed
authors.forename: A M
authors.initials: AM
authors.lastname: Noreddin
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D019540:Area Under Curve; D001372:Aza Compounds / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects*; D024841:Fluoroquinolones; D066298:In Vitro Techniques; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects* / Q000502:physiology; D008826:Microbial Sensitivity Tests; D008954:Models, Biological; D000077266:Moxifloxacin; D011804:Quinolines / Q000494:pharmacology*; D013212:Staphylococcus epidermidis / Q000187:drug effects* / Q000502:physiology; D014640:Vancomycin / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D001372:Aza Compounds; D024841:Fluoroquinolones; D011804:Quinolines; D014640:Vancomycin; D000077266:Moxifloxacin