Perfil da Sensibilidade Microbiana de Bactérias Isoladas nos Olhos de Cães com Ceratoconjuntivite Seca

Abstract

This study aims to evaluate the microbial sensitivity profile of bacteria isolated from the eyes of dogs with keratoconjunctivitis sicca (KCS). We evaluated 65 dogs (n=65) diagnosed with KCS and 30 healthy dogs (c=30) (control group). After diagnosis of KCS, conjunctival swabs were collected and the microbiological examinations performed under aerobic culture, antibiogram and minimum inhibitory concentration (MIC) for the antibiotics chloramphenicol, tobramycin, ofloxacin and moxifloxacin. With respect to the sensitivity to the tested antibiotics, polymyxin B, tobramycin and chloramphenicol obtained that highest percentages and tetracycline the lowest percentage. Regarding the results of the MIC, the fifteen most resistant strains of Staphylococcus pseudintermedius and the fifteen most resistant strains of Gram-negative were selected. For S. pseudintermedius, tobramycin demonstrated the highest percentage of sensitivity and ofloxacin and moxifloxacin the lowest. For Gram-negative, ofloxacina and moxifloxacina demonstrated (100%) of sensitivity, tobramycin (93,3%) and chloramphenicol (80%). Three multi-resistant strains of S. pseudintermedius were detected, one with isolated sensitivity to cefazolin, another to vancomycin and another to polymyxin B and amikacin. Remission from bacterial infection was achieved after 15 days in 100% of the animals topically treated with antibiotics selected according to the sensitivity. The bacteria isolated from the eyes of dogs with KCS presented variable sensitivity to the tested antibiotics, according to the species considered. The emergence of quinolone-resistant strains of S. pseudintermedius, with higher prevalence detected in the eyes, reinforces the need to identify the bacteria involved and antimicrobial susceptibility profile, as secondary infections, can be an aggravating and perpetuating factor of KCS.