Produção de biofilme e perfil de sensibilidade aos desinfetantes de sthaphylococcus coagulase positiva causadores de mastite subclinica em vacas

Abstract

The objective of this study was to evaluate the ability of Sthaphylococcus Coagulase Positive (SCP), isolated from milk samples in cases of bovine subclinical mastitis in the Leiteira Basin of the State of Alagoas, to produce biofilms and their sensitivity to disinfectants used in pre and post dipping . We selected 10 properties located in municipalities of the state of Alagoas, which supplied dairy milk under federal inspection. The CMT test was performed in 1150 cows and CMT positive samples were collected from 2+, totaling 891 samples that were submitted to microbiological examination for isolation and identification of SCP, totaling 148 isolates. The biofilm production capacity was determined by the microplate adhesion test. To evaluate the in vitro action of the disinfectants used in pre and post dipping the following active principles were used: lactic acid (2%), allantoin (0.05%), iodine (0.5%), chlorhexidine 0%), chlorine (2.5%), at the times of 15 ", 30" and 60 ". The adhesion test on microplates showed that 91.2% (135/148) of SCP isolates were able to form biofilm; Of these, 22.2%, 29.6% and 48.2% presented as strong, moderate and weak producers, respectively. The sensitivity profile of the isolates against chlorhexidine was 83.78%. As for iodine, we observed 66.22% sensitivity. For allantoin, the isolates had a sensitivity of 37.74%. For lactic acid, 22.3% of the samples were sensitive, and for chlorine, it was observed that 17.57% of the isolates were sensitive. Most isolates were able to produce biofilms, an ability associated with the potential of microorganisms to cause persistent and difficult to treat infections. The best in vitro disinfectant activity was observed for chlorhexidine and iodine and the importance of the periodic evaluation of the efficacy of the disinfectants used in the dairy properties of the studied region is emphasized.