Antibiotic susceptibility of clinical isolates of Staphylococcus intermedius and Staphylococcus aureus from dogs in Grenada.

ABSTRACT

Sixty-nine Staphylococcus intermedius isolates from various clinical conditions in dogs over a 3 year period were evaluated for in vitro susceptibility to 8 antibiotics using the disk diffusion method. The majority of the isolates originated from cases of pyoderma (30.4%), and otitis externa (29.0%). The least resistance was seen against cephalothin (1.6% of the 64 isolates, followed by chloramphenicol (3.9% of 26 isolates). Highest resistance was seen against ampicillin (34.4% of 32 isolates), followed by tertracycline (29.0% of 69 isolates). Resistance rates to other drugs were as follows enrofloxacin 17.1%, gentamicin 7.3%, neomycin 6.1% and amoxicillin-clavulanic acid, 4.6%. Eleven isolates of S. aureus, showed no resistance to cephalothin. Overall the S. intermedius and S. aureus isolates were highly sensitive to cephalothin (98.7% susceptibility), suggesting that the first generation cephalosporins may be most useful drugs for treatment of Staphylococcus infection in dogs in Grenada.