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Year 2012 - Volume 32, Number 12
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Phemotypic characterization, biofilm production and antimicrobial resistance of Staphylococcus spp. Isolates from cattle and buffaloes mastitis, 32(12):1219-1224
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ABSTRACT.- Guimarães G., França C.A., Krug F.S., Peixoto R.M., Krewer C.C., Lazzari A.M. & Costa M.M. 2012. [Phemotypic characterization, biofilm production and antimicrobial resistance of Staphylococcus spp. Isolates from cattle and buffaloes mastitis.] Caracterização fenotípica, produção de biofilme e caracterização da resistência aos antimicrobianos em isolados de Staphylococcus spp. obtidos de casos de mastite em bovinos e bubalinos. Pesquisa Veterinária Brasileira 32(12):1219-1224. Universidade Federal do Vale do São Francisco, Campus Ciências Agrárias, Rodov. BR 407 Km 12, Lote 543, Projeto de Irrigação Senador Nilo Coelho s/n, Petrolina, PE 56300-990, Brazil. E-mail: mateus.costa@univasf.edu.br
The aim of the present study was to evaluate the antimicrobial susceptibility pattern and to perform the phenotypic and genotypic characterization of the Staphylococcus spp. isolates from mastitis cases in cattle (n=30) and buffaloes (n=30). The susceptibility to antimicrobial drugs was performed by disk diffusion test and the presence of efflux pump was evaluated in Mueller Hinton (MH) Agar supplemented with ethidium bromide as well as by detection of msrA gene. Similarly, the PCR technique was done to detect mecA, blaZ and ermA, B e C genes, that were related after with the presence of antimicrobial resistance in disk diffusion test. The formation of biofilm was characterized using Congo Red Agar (CRA), microplate adherence and detection of icaD gene. Staphylococcus spp. isolates shown high antimicrobial susceptibility in disk diffusion test. The multidrug resistance (MDR) rate ranged from 0 and 0,5. In the efflux pump test, 26.7% of Staphylococcus spp. strains were positive in phenotypic method and 6.7% in PCR for msrA gene. The erm, mecA and blaZ genes were detected in 1.7%, 6.7% and 11.7% of Staphylococcus spp. strains respectively. In biofilm production tests, 23.3% of the samples were positive in CRA, 50% in microplate adherence test and 8.3% in icaD gene PCR. The cattle isolates were less sensitive to antimicrobial drugs when compared to the buffaloes ones. The characterization of these isolates is very important to guide a successful antimicrobial therapy. The biofilm presence in the isolates may be associated with other factors besides antimicrobial resistance. |
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