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The recent emergence of  in dogs with otitis externa or skin and soft tissue infections has become a significant zoonotic issues. In the current study, we investigated 1) the carriage rates of  among major staphylococci in healthy dogs and dogs with otitis externa, 2) antibiotic susceptibility profiles of  particularly methicillin resistance (MR), and 3) virulence factors associated with skin and soft tissue infections such as ability to form biofilm, resistance to cationic antimicrobial peptides (CAMPs), and carriage of staphylococcal enterotoxin genes. Among the 21  isolates, 5 isolates (24%) were determined to be methicillin-resistant (MRSS). Staphylococcal cassette chromosome  (SCC) typing revealed the presence of SCC type V in 4 MRSS isolates and type VII in one MRSS. Higher levels of antibiotic resistance, especially multidrug resistance, were observed in MRSS isolates compared to the methicillin-susceptible  (MSSS) isolates. In addition, MRSS isolates exhibited enhanced ability to form biofilm under static condition and all the 5 MRSS isolates carried three or more enterotoxin genes. However, there were no significant differences in resistance to CAMPs between MRSS and MSSS isolates. These findings suggest that coagulase-negative  is becoming more prevalent in canine otitis externa cases. Our results also highlight the presence of multidrug-resistant MRSS isolates with enhanced biofilm production and carriage of multiple enterotoxins.

journal of veterinary science

Carriage of<i>Staphylococcus schleiferi</i>from canine otitis externa: antimicrobial resistance profiles and virulence factors associated with skin infection

Carriage ofStaphylococcus schleiferifrom canine otitis externa: antimicrobial resistance profiles and virulence factors associated with skin infection