Motta Neto, RenatoCarvalho, Leonardo César Andriola2018-02-162018-02-162017-05-19CARVALHO, Leonardo César Andriola. Etiologia e perfil de resistência de bactérias isoladas de otite externa em cães. 2017. 96f. Dissertação (Mestrado em Ciências Biológicas) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2017.https://repositorio.ufrn.br/jspui/handle/123456789/24747The canine external otitis is a relevant disease regarding veterinary clinic. Considering the high frequency of treatment of dogs with external bacteria otitis, this research aims to identify the etiological frequency of otopathy and trace the resistance profile of the Methicillin Resistant Staphylococcus (MRS) and enterobacteria that produce Extended Spectrum Beta-Lactamase (ESBL) in outpatients and internment patients. The samples were submitted to primary isolation, tests of antimicrobial susceptibility and bacterial resistance. For the Staphylococcus sp. the Disk Test was applied along with the resistance test to Methicillin (Met-25). In the positive strains for Met-25, a Polimerase Chain Reaction (PCR) was applied to detect the mecA gene. For the PCR positive strains, a Minimum Bactericidal Concentration (MBC) of chlorhexidine gluconate was determined. The isolated bacterial groups of the 140 samples collected were: Staphylococcus sp. (122 – 49.38%), Pseudomonas sp. (22 – 8.91%), enterobacteria (19 – 7.69%), Enterococcus sp. (17 – 6.88%) and Acinetobacter sp. (12 – 4.86%). 14 MRS strains (11.47%) were observed and all off them had the mecA gene. 14 Staphylococcus sp. were Disk Test positive. Concerning the positive Staphylococcus coagulase, the MBC was 500.00μg/mL (0.5%) whereas for the negative Staphylococcus coagulase the MBC value was 62.500μg/mL (0.0625%). 3 ESBL enterobacteria strains were detected. The more effective antimicrobial for the Staphylococcus sp. were: Linezolid (100%), Rifampicin (94.26%) and Chloramphenicol (92.62%). Regarding the Pseudomonas sp.: Cefepime (100%), Imipenem (100%) and Meropenem (100%). Regarding the enterobacteria: Ertapenem (100%), Imipenem (100%) and Cefotaxime (84.21%). Regarding the Enterococcus sp.: Chloramphenicol (100%), Linezolid (94.12%) and Vancomycin (88.24%). Regarding the Acinetobacter sp.: Imipenem (100%), Meropenem (100%) and Ticarcillin with Clavulanate (91.67%). Although the mecA gene and the enterobacteria that produce ESBL are briefly presented in this research, there is a need for constant monitoring of isolated strains in domestic animals. The bacteriological growth and the susceptibility tests in the antimicrobial agents are of great importance in the veterinary clinic routine in order to insure the success in treating canine otological infections.Acesso AbertoOtite externa caninaResistência aos antimicrobianosTestes de resistência bacterianamasterThesisCNPQ::CIENCIAS BIOLOGICAS