Antimicrobial susceptibility of Staphylococcus pseudintermedius isolated from dogs and cats in Croatia during a six-month period

Staphylococcus pseudintermedius is part of the normal flora of dogs but is also commonly found as an opportunistic pathogen. Antimicrobial resistance in S. pseudintermedius is changing over time and is generally rising steadily for those antimicrobials that are frequently used. In this work, the susceptibility of 106 canine and feline isolates of S. pseudintermedius was determined by the disk-diffusion method. Isolates were collected from various body sites of diseased dogs and cats during a six-month period in 2011. Most isolates were susceptible to amoxycillin/clavulanic acid, cephalexin, enrofloxacin and oxacillin (92.5%), followed by trimethoprim-sulfamethoxazole (90.6%) and gentamicin (82.1%). Lower susceptibility was found for minocycline (67.0%), erythromycin, clindamycin and tetracycline (62.3%) and kanamycin (58.5%). Only 21.7% of the isolates were susceptible to ampicillin. Susceptibilities of isolates were compared from different isolation sites and from different temporal origins. The possible association of resistances to different antimicrobial agents is discussed.