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Evaluation of biofilm production by Pseudomonas aeruginosa from canine ears and the impact of biofilm on antimicrobial susceptibility in vitro.
Vet Dermatol. 2013 Aug; 24(4):446-9, e98-9.VD

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.

Authors+Show Affiliations

Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada. cpdermvet@hotmail.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23738965

Citation

Pye, Charlotte C., et al. "Evaluation of Biofilm Production By Pseudomonas Aeruginosa From Canine Ears and the Impact of Biofilm On Antimicrobial Susceptibility in Vitro." Veterinary Dermatology, vol. 24, no. 4, 2013, pp. 446-9, e98-9.
Pye CC, Yu AA, Weese JS. Evaluation of biofilm production by Pseudomonas aeruginosa from canine ears and the impact of biofilm on antimicrobial susceptibility in vitro. Vet Dermatol. 2013;24(4):446-9, e98-9.
Pye, C. C., Yu, A. A., & Weese, J. S. (2013). Evaluation of biofilm production by Pseudomonas aeruginosa from canine ears and the impact of biofilm on antimicrobial susceptibility in vitro. Veterinary Dermatology, 24(4), 446-9, e98-9. https://doi.org/10.1111/vde.12040
Pye CC, Yu AA, Weese JS. Evaluation of Biofilm Production By Pseudomonas Aeruginosa From Canine Ears and the Impact of Biofilm On Antimicrobial Susceptibility in Vitro. Vet Dermatol. 2013;24(4):446-9, e98-9. PubMed PMID: 23738965.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of biofilm production by Pseudomonas aeruginosa from canine ears and the impact of biofilm on antimicrobial susceptibility in vitro. AU - Pye,Charlotte C, AU - Yu,Anthony A, AU - Weese,J Scott, Y1 - 2013/06/05/ PY - 2013/04/11/accepted PY - 2013/6/7/entrez PY - 2013/6/7/pubmed PY - 2014/3/13/medline SP - 446-9, e98-9 JF - Veterinary dermatology JO - Vet. Dermatol. VL - 24 IS - 4 N2 - 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. SN - 1365-3164 UR - https://www.unboundmedicine.com/medline/citation/23738965/Evaluation_of_biofilm_production_by_Pseudomonas_aeruginosa_from_canine_ears_and_the_impact_of_biofilm_on_antimicrobial_susceptibility_in_vitro_ L2 - https://doi.org/10.1111/vde.12040 DB - PRIME DP - Unbound Medicine ER -