Detection of Beta-lactamases and extended-spectrum Beta-lactamases of enterobacteriaceae isolated from chicken and their antibiotic susceptibility analysis

We studied some features of 9 clinical strains isolated from chicken.The tests included three parts.Firstly,clinical strains were identified with Vitek-32 automatic microbe system;secondly,they were detected for beta-lactamases and extended-spectrum beta-lactamases;thirdly,the minimum inhibitory concentrations of different anbimicrobial agents against above 9 strains were determined.The studied results show that 1 strain is Salmonella and 8 strains are Escherichia coli among 9 strains.Nine strains all produce beta-lactamases,and only 1 among 9 strains produces extended-spectrum beta-lactamase.Nine strains were differently resistant to tested antimicrobials,but beta-lactam antibiotics associating with inhibitors or multi-antibiotics can reduce resistance.