Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112059
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Type: Journal article
Title: In vitro antimicrobial activity of narasin against common clinical isolates associated with canine otitis externa
Author: Chan, W.
Hickey, E.
Khazandi, M.
Page, S.
Trott, D.
Hill, P.
Citation: Veterinary dermatology, 2018; 29(2):149-e57
Publisher: Wiley
Issue Date: 2018
ISSN: 0959-4493
1365-3164
Statement of
Responsibility: 
Wei Yee Chan, Elizabeth E. Hickey, Manouchehr Khazandi, Stephen W. Page, Darren J. Trott and Peter B. Hill
Abstract: Background: Antimicrobial resistance and antimicrobial stewardship are of ever-increasing importance in veterinary medicine. Re-purposing of old drugs that are not used in human medicine is one approach that addresses the emergence of multidrug resistance in canine skin and ear infections, and can reduce the use of critically important human antibiotic classes. Hypothesis/Objectives: To determine the antimicrobial activity of narasin, a polyether ionophore conventionally used as a rumen modifier and anticoccidial agent in production animals, against common clinical isolates of canine otitis externa (OE). Animals/Isolates: Clinical isolates (n = 110) from canine OE were tested, including 17 meticillin-susceptible Staphylococcus pseudintermedius (MSSP), 13 multidrug-resistant Staphylococcus pseudintermedius (MDRSP), and 20 each of β-haemolytic Streptococcus spp., Pseudomonas aeruginosa, Proteus mirabilis and Malassezia pachydermatis. Methods: Bacterial and yeast isolates were subcultured, suspended in broth and inoculated into 96-well plates. Organisms were tested against concentrations of narasin ranging from 0.03 to 128 μg/mL. Minimal inhibitory concentrations (MICs) were determined after overnight incubation. Results: Narasin MICs for staphylococcal and streptococcal isolates ranged from 0.06 to 0.25 μg/mL; MIC50 and MIC90 values for both organisms were 0.125 μg/mL. No MICs were achieved for Pseudomonas or Proteus isolates. There was a weak antifungal effect against M. pachydermatis isolates (MIC 32 to >128 μg/mL). Conclusions and Clinical Relevance: Narasin was effective against Gram-positive bacteria and had antifungal activity at higher concentrations against M. pachydermatis. However, the lack of Gram-negative activity would prevent its use as a sole antimicrobial agent in cases of canine OE.
Keywords: Animals; Dogs; Bacteria; Fungi; Malassezia; Otitis Externa; Dog Diseases; Pyrans; Anti-Bacterial Agents; Antifungal Agents; Microbial Sensitivity Tests; Methicillin-Resistant Staphylococcus aureus; Drug Repositioning
Rights: © 2018 ESVD and ACVD
RMID: 0030081232
DOI: 10.1111/vde.12516
Grant ID: http://purl.org/au-research/grants/arc/LP130100736
Appears in Collections:Animal and Veterinary Sciences publications

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