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Monografia Acesso embargado Perfil antimicrobiano de cepas de Escherichia coli, Klebsiella pneumoniae e Pseudomonas aeruginosa isoladas do rio Tubarão/SC(2018) Wagner, Flávia da SilvaFreshwater in rivers is fundamental for the development of cities, but at the same time it presents itself as an important carrier of microorganisms of medical importance, such as Escherichia coli, Klebsiella spp. and Pseudomonas aeruginosa. The presence of these bacteria in the environment, together with the release of organic residues from diverse origins, contributes to the maintenance and multiplication of these bacteria in the environment and consequently optimizes the acquisition and dispersion of pathogenicity and resistance. Despite being a natural mechanism, anthropogenic activity has greatly influenced these processes and bacterial resistance to antibiotics is currently considered one of the major public health problems since many of these bacteria have become resistant to drugs that were commonly susceptible. Thus, the main objective of the present study was to trace the antibiotic resistance profile of strains of Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa isolated from the urban perimeter of the Tubarao River, in the Tubarao city / SC. Five superficial water samples were analyzed, using a filter membrane technique for bacterial isolation, in addition to 5 different culture media. To complement the bacterial identification was performed the Gram staining technique and to verify the sensitivity of the bacteria against the antibiotics was done AST, according to the Kirby-Bauer disk diffusion method. Bacterial growth was observed in all culture media and at all collection sites and the characteristic growth of E. coli, K. pneumoniae and P. aeruginosa was also observed at all of these points. The AST was made for these bacteria, P3 (73.3%), followed by P1 (53.3%), and finally P4 (44.4%). P. aeruginosa (77,7%), K. pneumoniae (59.9%) and E. coli (33.3%) were found to be the most resistant species to the antibiotics tested. However, from the obtained results we can identify the presence of potentially pathogenic microorganisms that are resistant to several antibiotics, and the isolation of these in the perimeter is of paramount importance for the well-being of the population.