Abstract
Streptococcus canis is an important opportunistic pathogen that infects animals and humans. It causes various infections, including streptococcal toxic shock syndrome, otitis externa, arthritis, skin infections, necrotizing fasciitis, and septicemia in dogs and cats. It can also lead to human infections. There are still very few specific studies on the identification and antimicrobial resistance of this pathogen. In this study, the phenotypic and biochemical properties of 12 S. canis isolates obtained from the vaginal discharge of 11 dogs and the open wound of one dog with facial necrosis were determined, and their susceptibility to some antibiotics were investigated. The phenotypic and biochemical properties of 12 isolates, such as esculin hydrolysis, hippurate hydrolysis, synergistic CAMP-like hemolytic activity, brain hearth infusion agar containing 6.5% NaCl, and carbohydrate fermentation were investigated by conventional bacteriological methods. All the isolates were found in Group G according to Lancefield serogrouping. The presence of the species-specific 16S-23S rRNA gene intergenic spacer region (ISR) and sodAint gene was also detected in all the isolates using the polymerase chain reaction (PCR) method. All the isolates were detected to be susceptible to penicillin G, cefoperazone, ampicillin and amoxicillin-clavulanic acid, and resistant to gentamicin and neomycin.
Highlights
Streptococcus canis is a well-known pathogen of dogs and has been shown to cause mainly skin, respiratory, genital, and urinary tract infections (Lamm et al 2010)
We conclude that the identification of S. canis can be made more accurately and faster by detecting species-specific intergenic spacer region (ISR) and sodAint genes
Unlike Staphylococci and Enterobacteriaceae, pets infected with S. canis were still susceptible to antibiotics commonly used in veterinary medicine
Summary
Streptococcus canis is a well-known pathogen of dogs and has been shown to cause mainly skin, respiratory, genital, and urinary tract infections (Lamm et al 2010). S. canis, which has been reported to cause many serious diseases, such as otitis externa, polyarthritis, endocarditis, abortion, neonatal septicemia, streptococcal toxic shock syndrome, and facial necrosis in cats and dogs (DeWinter and Prescott 1999; Lysková et al 2007; Pesavento et al 2007; Avki et al 2008; Lamm et al 2010; Sharma et al 2012; Abma et al 2013; Mališová et al 2019; Glassman et al 2020), has been reported in mastitis cases in cows (Chaffer et al 2005; Hassan et al 2005; Tikofsky and Zadoks 2005). The authors noted that there might be differences in the antibiotic susceptibilities of S. canis isolates obtained from various clinical cases of animals (Hassan et al 2005; Lysková et al 2007; Diren Sıǧırcı et al 2012)
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