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O objetivo deste estudo foi avaliar a sensibilidade do Staphylococcus aureus ao extrato da jurema-preta (Mimosa tenuiflora (Wild) Poir.). Foram isoladas 25 cepas de S. aureus de amostras de leite de vacas com histórico de mastite clínica e subclínica, submetidas ao teste de atividade antimicrobiana do extrato de M. tenuiflora. Os testes de sensibilidade in vitro foram realizados utilizando o método de difusão em meio sólido. Em seguida foram inoculados 50 &#956;L do extrato nas seguintes diluições 1:1; 1:2; 1:4; 1:8; 1:16; 1:32; 1:64; 1:128; 1:256; 1:512. As placas foram incubadas a 37 °C, por um período de 24 a 48 h. Os ensaios foram realizados em triplicata. Observou-se halos de inibição entre 6 e 25 mm de diâmetro. O percentual de sensibilidade das amostras testadas foi distribuido em: 1:1 a 1:32 (100%); 1:64 (92%); 1: 128 (72%); 1:256 (28%); 1:512 (0%). O estudo da M. tenuiflora sobre as amostras de S. aureus testadas demonstrou que a planta tem ação antimicrobiana. The aim of this study was to evaluate the sensitivity of the S.aureus to the extract of Mimosa tenuiflora (Wild) Poir. (jurema-preta). Twenty five strains of S. aureus were isolated from milk samples with description of clinical and subclinical mastitis and submitted to antimicrobial activity test of the M. tenuiflora extract. The sensitivity in vitro tests were carried out using the agar difusion method (well diffusion method). After that, 50&#956;L of the extract were inoculated in the following dilutions: 1:1; 1:2; 1:4; 1:8; 1:16; 1:32; 1:64; 1:128; 1:256; 1:512. The plates were incubated at 37 ºC during 24 and 48 h. The tests were made in triplicate. Halos of inhibition were observed between 6 and 25 mm of diameter. The percentage of sensitivity of the tested samples was distributed in: 1:1 to 1:32 (100%), 1:64 (92%); 1: 128 (72%); 1:256 (28%); 1:512 (0%). The study of M. tenuiflora on the tested S. aureus samples it demonstrated that the plant has antimicrobial action

Atividade biológica da jurema-preta (Mimosa tenuiflora (Wild) Poir.) sobre Staphylococcus aureus isolado de casos de mastite bovina