机构地区:[1]南京农业大学动物医学院,江苏南京210095
出 处:《畜牧与兽医》2017年第5期134-141,共8页Animal Husbandry & Veterinary Medicine
基 金:中央高校基本科研业务费专项资金资助(KYZ201326);国家大学生创新创业训练计划(201510307051)
摘 要:为了解禽致病性大肠杆菌耐药表型及耐药基因的情况,选取江苏、安徽等地分离的53株禽致病性大肠杆菌,采用药敏纸片法对9种抗菌药物进行药敏试验,并对四环素类tet(A)、tet(B)、tet(C)、tet(W)、tet(M)、tet(O)、tet(K)、tet(L)耐药基因,喹诺酮类GryA、ParC耐药基因,磺胺类sulⅠ、sulⅡ、sulⅢ耐药基因,β-内酰胺类SHV、CTX-M、ompCA耐药基因,氨基糖苷类aac(3)-Ⅰ、aac(3)-Ⅱ、aac(6')-Ⅰb、aac(6')-Ⅱ、ant(3″)-Ⅰ、armA、rmtA、rmtB、rmtC、rmtD、npmA耐药基因进行PCR检测。结果显示:53株禽致病性大肠杆菌对磺胺异噁唑、环丙沙星、氨苄西林、多西环素的耐药率较高,分别为88.68%(47/53)、71.71%(38/53)、86.79%(46/53)、75.47%(40/53)。其中50株禽致病性大肠杆菌表现为多重耐药,耐4、5、6种药物的现象最为普遍,且不同地区菌株存在差异。tet(A)是四环素耐药基因中最为流行的一种耐药基因(52.83%,28/53),喹诺酮类耐药基因主要由gryA(94.33%,50/53)、parC(94.33%,50/53)基因编码,耐磺胺类药物sulⅠ、sulⅡ、sulⅢ基因均有检出,分别为96.23%(52/53)、98.11%(48/53)、86.79%(46/53),耐β-内酰胺类药物中仅检出ompC A基因(30.19%,16/53),在检测的11种耐氨基糖苷类耐药基因中,最为流行为aac(3)-Ⅱ、aac(6')-Ⅰb、ant(3″)-Ⅰ基因,分别为92.59%(49/53)、98.11%(52/53)、100%(53/53)。耐药基因与相关耐药菌株检出率基本呈正相关。试验结果表明:53株禽致病性大肠杆菌耐药性高,耐药谱广,耐药基因流行现象十分普遍。本试验结果能为禽致病性大肠杆菌的耐药现状与临床用药提供理论指导。To investigate the antibiotic resistance and resistance genes in avian pathogenic Escherichia coli (APEC) isolated from Jiangsu and Anhui provinces, the susceptibility to 9 antibiotics were conducted on 53 isolates of APEC. Tetracycline-resistant genes ( tet (A), tet ( B), tet ( C), tet ( W), tet ( M), tet (0), tet ( K), tet ( L ) ), quinolone-resistant genes (gryA, parC), sulfisoxazole-resistant genes ( sul Ⅰ , sul Ⅱ , sulⅢ ) , β-1actamase-resistant genes ( SHV, CTX-M, ompCA ) and aminoglycoside-resistant genes ( aac ( 3 ) - Ⅰ , aac (3) -Ⅱ, aac (6") -lb, aac (6′) -Ⅲ, ant (3" ) -Ⅰ , armA, rmtA, rmtB, rmtC, rmtD, npmA) were detected by using conventional PCR. The results showed that the resistance rates of the 53 isolates to sulfisoxazole, ciprofloxacin, ampicillin and deoxytetracy- cline were high, which were 88.68% (3/53) , 71.71% (38/53) , 86.79% (46/53) and 75.47% (40/53) , respectively. Among them, 50 isolates were multidrug resistant strains, and the number of APEC isolates, which were resistant to 4, 5 or 6 antibiotics was relatively lar- ger than others. Also, the resistant rates varied in different areas. As revealed by detecting resistance detemfinants, tet (A) was the most prevalent gene among tetracycline, which accounted for 52. 83% (28/53). GryA (94. 33%, 50/53) and parC (94. 33%, 50/53) were main quinolone-resistant genes in APEC. Three kinds of sulfisoxazole-resistant genes, sul [ (96. 23%, 48/53) , sul Ⅱ (98. 11%, 52/ 53) and sulⅢ (86. 79%, 46/53) were all detected in APEC, while ompCA (30. 19%, 16/53) was the main β-lactamase resistance gene. Among 11 aminoglycoside resistance genes, aac (3) -Ⅱ (92.59%, 49/53), aac (6′) - I (98. 11%, 52/53) and ant (3") - I ( 100%, 53/53) were most common resistance genes in APEC. The detection rate of resistance phenotype was positively correlative tothe relevant resistance genes. The
分 类 号:S852.61[农业科学—基础兽医学]
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