Abstract
Enterococci were isolated from sheep faeces and cheese taken in the «Parco nazionale dei monti Sibillini»; then they were submitted to the antibiotic susceptibility test and to the PCR reaction to amplify tet M and tet O genes. The analysis showed that 23,64% of Enterococci from sheep and 30,77% from cheese were resistant to tetracycline; 14 strains from sheep and 5 from cheese contained tet M and tet O genes as genetic determinants of resistance. These results allow to say that resistant bacteria and genes have the possibility to be transferred from animals to derived food; therefore reducing antibiotic use in farm animals could affect the amount of resistant microorganisms that can reach human beings using this way of diffusion.
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