Agentes causadores de infecções urinárias em cães em Rio Verde–GO: ocorrência e determinação da sensibilidade a antimicrobianos

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The urinary tract infections (UTI) occur usually when there is a temporary or permanent failure in the mechanisms of host defense and sufficient number of mainly bacteria that multiply and persist in a portion of the urinary tract. We collected 26 urine samples obtained by cystocentesis in dogs with clinical signs of UTI, in 2010, the Center for Animal Control and the Veterinary Hospital at Fesurv, located in Rio Verde-GO, with the objective to establish the rate of UTI, the etiologic agents and antibiotic susceptibility. All samples were subjected to urinalysis and urine culture to also. There were bacteriuria in 16 urinalysis and only four samples with positive culture. The identification of the bacteria was performed by traditional biochemical methods and antibiotic susceptibility by disk diffusion method. There was a higher incidence of UTI in females. Gram-negative isolates were Citrobacter sp and Klebsiella sp. And among the Gram-positive Staphylococcus aureus, S. saprophyticus and S. epidermis were most prevalent. The antibiotic nitrofurantoin, tetracycline, cephalothin, chloramphenicol, norfloxacin, erythromycin and enrofloxacin were effective in the treatment of Gram-positive and only cephalothin and enrofloxacin in the treatment of Gram-negative bacteria. The results reinforce the need for knowledge of antimicrobial susceptibility of bacteria causing UTI, to prevent the misuse of antibiotics.