四川地區(qū)豬大腸桿菌的耐藥性檢測(cè)
[Abstract]:Escherichia coli (Escherichia coli) is one of the most abundant bacteria in human and animal intestines. Most strains of Escherichia coli are not pathogenic, but can cause extraintestinal infection under certain conditions. Some serotype strains are virulent and can cause human and many animal diseases, often lead to diarrhea and septicemia, and can cause fatal infection. Clinical use of antibiotics for the treatment of Escherichia coli disease, but in recent years with the use of a large number of antibiotics, multi-drug resistant Escherichia coli strains are increasing, to the safety of humans and animals has brought great hidden danger. In order to understand the drug resistance characteristics of Escherichia coli in large-scale pig farms in Sichuan Province, the Escherichia coli isolates and drug resistance analysis were carried out in several large-scale pig farms in Sichuan Province. The resistance genes of fluoroquinolone-resistant bacteria were detected. Scientific experimental data were provided for the prevention and control of Escherichia coli virus in large-scale pig farms in Sichuan Province. 1. Isolation and identification of E. coli from large-scale pig farms in Sichuan Province were conducted to collect feces or liver samples of infected pigs. E. coli isolated from infected pig tissues was isolated by routine bacterial isolation technique. The isolated bacteria were identified by morphology, culture and biochemical characteristics. Using mice as animal model, 198 strains of Escherichia coli were identified, of which 26 strains were pathogenicity. The drug resistance of 2198 strains of Escherichia coli to 9 kinds of non-quinolones and 9 quinolones were tested by Kirby-Bauer method recommended by CLSI. The results showed that 2198 strains of Escherichia coli were resistant to 9 kinds of non-quinolones and 9 kinds of quinolones. Among non-quinolones, the highest resistance rate of florfenicol was 94.95% (1888 / 198), the lowest resistance rate of amikacin was 23.23% (46 / 198), the highest resistance rate of enrofloxacin was 87.88% (174 / 198), and the lowest resistance rate of levofloxacin was 71.21% (141198). The drug resistance of Escherichia coli was different in different regions. There were also differences in drug resistance rates between different regions, and the multidrug resistance rate was higher, and the most serious was 15C16 / 17. 3198 strains of Escherichia coli quinolone resistance genes were amplified by primers of qnr AqnrBnrBnnrBPQnrDnnrDnnrSnSAAC (6')-Ib, qepA and other genes, respectively. 3198 strains of Escherichia coli were tested by PCR for their resistance genes according to the sequence of quinolone resistance genes. The results showed that qnrC gene was not detected in all the 198-isolated strains, and the detection rate of qnrA gene was 11.11% (22 / 198), qnrB gene 7.58% (15 / 198), qnrS) 9.09% (18 / 198), aac (6') -Ib-cr 12.12% (24 / 198), qepA) 4.04% (8 / 198). The detection rate of), qnrD gene was 1.01% (2 / 198), aac (6') and the detection rate of Ib-cr gene was 12.12% (24 / 198), qepA). The results showed that the drug resistance of Escherichia coli was serious and multidrug resistance existed in large-scale pig farms in Sichuan Province. The resistance of Sichuan porcine Escherichia coli to quinolone is related to plasmid mediated qnrA,qnrB,qnrS,qnrD,aac (6')-Ib-cr and qepA genes.
【學(xué)位授予單位】:四川農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:S852.61
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