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  • Title: In vitro antiseptic susceptibilities for Staphylococcus pseudintermedius isolated from canine superficial pyoderma in Japan.
    Author: Murayama N, Nagata M, Terada Y, Okuaki M, Takemura N, Nakaminami H, Noguchi N.
    Journal: Vet Dermatol; 2013 Feb; 24(1):126-9.e29. PubMed ID: 23331688.
    Abstract:
    BACKGROUND: Topical therapy, particularly with chlorhexidine, is becoming increasingly common as a treatment option for canine pyoderma; however, there are limited studies on the susceptibility of Staphylococcus pseudintermedius to chlorhexidine compounds. OBJECTIVES: To determine the in vitro susceptibility of both meticillin-resistant and meticillin-susceptible S. pseudintermedius isolates to chlorhexidine and other antiseptic agents and the presence of multidrug efflux pump genes. SAMPLES: One hundred S. pseudintermedius isolates from 23 initial and 77 recurrent cases of canine pyoderma. METHODS: After bacterial identification and mecA testing, minimal inhibitory concentrations (MICs) of antiseptic agents were determined. Multidrug efflux pump genes, including qacA, qacB and smr, were identified. RESULTS: Of the 100 isolates, 57 were identified as meticillin-resistant S. pseudintermedius. The MIC(90) of chlorhexidine acetate, chlorhexidine gluconate, acriflavine, ethidium bromide and benzalkonium chloride were 1, 1, 2, 0.5 and 2 μg/mL, respectively. Multidrug efflux pump genes qacA, qacB and smr were not detected in any of the isolates. CONCLUSIONS AND CLINICAL IMPORTANCE: The MICs for chlorhexidine and other antiseptics remain low, and multidrug efflux pump genes were not found in the tested isolates.
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