Risk factors associated with the antimicrobial resistance of staphylococci in canine pyoderma

Abstract

This study reports the susceptibility to antimicrobial agents of staphylococci 4 (n=105) isolated from dogs, and the factors associated with this resistance. The study 5 animals were 23 healthy dogs (group A), 24 with first-time pyoderma (group B), and 27 6 with recurrent pyoderma that had undergone long-term antibiotic treatment (group C). 7 Staphylococci were more commonly isolated from the pyoderma-affected than the 8 healthy dogs (p<0.0001). 9 10 Some 78% of the isolates were resistant to at least one antimicrobial agent. 11 Resistance to amoxicillin-clavulanate,cephalosporins (OR 4.29, 95% CI [1.15, 16.3] 12 respectively), enrofloxacin (OR 9.47, 95% CI [1.53, 58.5]) and ciprofloxacin (OR 79.7 13 95% CI [3.26, 1947.4]) was more common among group C isolates. Some 32% of all 14 the isolates were multiresistant (MR) and 10.4% were methicillin-resistant (MRS). The 15 probability of isolating MRS staphylococci in group C increased by a factor of four 16 (95% CI [1.18, 17.9]) compared to A plus B. Multi-resistant (MR) isolates were 17 obtained more commonly from urban than rural dogs (OR 3.79, 95% CI [1.09, 13.17]). 18 All the MRS staphylococci encountered were obtained from urban dogs and more 19 commonly from male dogs (p= 0.07). 20 21 This study shows that dogs bred in urban habitat, with a history of antibiotic 22 therapy in the past year represents significant risk of being carriers of isolates resistant 23 to methicillin (MRS) and other antimicrobials. These factors should be considered 24 before applying an antimicrobial treatment in veterinary clinics.