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.
BACKGROUND: Topical therapy, particularly with chlorhexidine, is becoming increasingly common as a treatment option for caninepyoderma; 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 caninepyoderma. 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.
Authors: Des Field; Noémie Gaudin; Francy Lyons; Paula M O'Connor; Paul D Cotter; Colin Hill; R Paul Ross Journal: PLoS One Date: 2015-03-19 Impact factor: 3.240