We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Evaluation of biofilm production by Pseudomonas aeruginosa from canine ears and the impact of biofilm on antimicrobial susceptibility in vitro.
- Authors
Pye, Charlotte C.; Yu, Anthony A.; Weese, J. Scott
- Abstract
Background Pseudomonas aeruginosa is a common cause of canine otitis; P. aeruginosa biofilm formation has been documented in human medicine, but the role of biofilms in canine disease is not well documented. Bacteria within biofilms can be more resistant to antibiotics compared with their planktonic form; therefore, understanding the biofilm-forming capacity of isolates and their susceptibility to antimicrobials is important when developing treatment regimens. Hypothesis/Objectives To evaluate the biofilm-forming capacity of canine otic isolates of P. aeruginosa and to compare the minimal inhibitory concentration ( MIC) of the planktonic versus biofilm-embedded bacteria. Methods Biofilm-forming ability was assessed using a microtitre plate assay. Broth microdilution was used to assess the MICs of neomycin, polymyxin B, enrofloxacin and gentamicin for the planktonic and biofilm-embedded bacteria. Results Eighty-three isolates from dogs with otitis were tested; 33 (40%) were classified as biofilm producers. Biofilm MICs for polymyxin B, neomycin, gentamicin and enrofloxacin were significantly higher than for the planktonic form ( P < 0.05). Conclusions and clinical importance Biofilm production by otitis isolates of P. aeruginosa is common and may play a role in the pathogenesis of disease. The MICs for biofilm-embedded bacteria differ from their planktonic counterparts, potentially leading to a lack of response to treatment. If polymyxin B, gentamicin, neomycin or enrofloxacin is to be used for topical treatment of a Pseudomonas otitis, the concentration of the medication should be increased, in particular if addressing chronic otitis, because biofilms may have developed.
- Subjects
BIOFILMS; PSEUDOMONAS aeruginosa; MICROBIAL sensitivity tests; OTITIS; ANTIBIOTICS
- Publication
Veterinary Dermatology, 2013, Vol 24, Issue 4, p446
- ISSN
0959-4493
- Publication type
Article
- DOI
10.1111/vde.12040