共查询到20条相似文献，搜索用时 542 毫秒
1.
本研究旨在调查内蒙古赤峰、通辽地区不同来源的大肠杆菌对抗生素类药物的耐药情况。采用K-B法分析来源于鹅、牛和猪等患病动物分离出的46株大肠杆菌对13种常用的抗生素类药物的耐药性;鹅源和猪源大肠杆菌对盐酸多西环素的耐药率最高,分别达95.2%和93.3%;牛源大肠杆菌对盐酸沙拉沙星、恩诺沙星和盐酸多西环素的耐药率最高,达80.0%。多重耐药性结果表明,患病动物的大肠杆菌以6耐（23.9%）为主;牛源大肠杆菌则以7耐（40%）最多。总体耐药谱型以恩诺沙星/氟苯尼考/盐酸多西环素/阿莫西林/硫酸新霉素为主（24.4%）。不同来源的大肠杆菌对抗生素类药物均产生了严重的耐药性,因此不但要求养殖人员学会合理使用抗生素类药物,同时研究开发逆转耐药性的新药物或对抗生素类药物有增敏效用的新药物十分必要。 相似文献
2.
Drug resistance in strains of Escherichia coli isolated from the intestinal tract of pigs in Norway.
E Liven 《Acta veterinaria Scandinavica》1979,20(2):258-269
Faecal samples from 95 healthy pigs and samples of jejunal content from 85 piglets suffering from colienterotoxaemia were tested for the presence of drug resistant E. coli strains. Practically all pigs in both groups harboured E. coli strains resistant to one or more of the 6 antibiotics/chemotherapeutic agents tested (Oxytetracycline, streptomycin, sulphaisodimidin, neomycin, ampicillin, chloramphenicol). Almost 100% of healthy and approx. 90% of diseased pigs harboured strains resistant to Oxytetracycline, streptomycin and sulphaisodimidin. Pigs with strains resistant to neomycin, ampicillin and chloramphenicol were less frequently found. The predominant coliform flora consisted of E. coli strains” resistant to Oxytetracycline, streptomycin and sulphaisodimidin in 71% to 81% of diseased pigs and in 47% to 69% of the healthy pigs. In diseased pigs ¾ of the animals had a coliform flora dominated by neomycinresistant E. coli strains.Of the 721 resistant E. coli strains isolated from healthy pigs, 11% were single resistant while the corresponding figure for the 518 resistant strains isolated from diseased pigs was 6%. Thus 89% and 94% of strains showed simultaneous resistance to 2 or more antibiotics. E. coli strains resistant to 3 or more drugs were found in approx. 60% and 70% of the isolates from healthy and diseased animals, respectively. Oxytetracycline/streptomycin/sulphaisodimidin resistance was most commonly found, approx. 22% and 38% of the strains from healthy and diseased pigs, respectively, showing this resistance pattern.Transmission of drug resistance which was examined in E. coli strains originating from the diseased pigs was demonstrated in approx. 76% of the isolates. The incidence of drug resistance transfer in single, double, triple and quadruple resistant strains was 11%, 68%, 97% and 98%, respectively. 相似文献
3.
河南省部分地区猪群大肠杆菌分离菌的耐药性比较分析 总被引：1，自引：0，他引：1
为掌握河南省猪源大肠杆菌的耐药情况,于2013年至2018年对河南省郑州、开封、焦作、许昌四个地区部分规模化养猪场分离出的856株大肠杆菌,采用CLSI推荐的微量肉汤稀释法,调查其对8类13种代表性抗菌药物的耐药性。结果表明,856株大肠杆菌对氧氟沙星、黏菌素、庆大霉素、头孢噻呋和阿莫西林/棒酸等5种药物的耐药率在35.0%以下,分别为32.2%、31.1%、25.5%、15.5%和30.0%;对恩诺沙星、四环素、多西环素、大观霉素、氟苯尼考、磺胺异恶唑、复方新诺明和氨苄西林等8种药物的耐药率范围为45.0%～95.0%,其中对四环素、多西环素和磺胺异恶唑等3种药物的耐药率高达90.0%以上;多重耐药集中于耐5、6和7类抗生素,耐3类及以上药物的菌株占90.0%。本研究结果表明河南省部分养殖场猪源大肠杆菌耐药形势严峻,应加强对其监测和控制。 相似文献
4.
XUAN Hui-yong GAO Chao LIN Ya-jun XIA Xu-jin XIA Li-ning WANG Ying-bin MA Yang 《中国畜牧兽医》2016,43(8):2150-2155
In order to understand the resistance of E.coli to clinical antimicrobial drugs from different farms in Kuitun area of Xinjiang,the bovine fecal samples were collected using the anal swab and E.coli was isolated from 123 (30),127 (30) and 128 (30) farms,respectively.The minimum inhibitory concentrations of E coli isolated from fecal samples to 10 antimicrobial drugs were determined by agar dilution method and the difference of resistance rate of E.coli from different farms was compared by chi square test.The results showed that the resistance rates of 128 farm to amoxicillin/clavulanic acid (33.3%) and apramycin (23.3%) were relatively high;The resistance rates of 127 farm to ampicillin (20.0%),amoxicillin/clavulanic acid (16.7%) and florfenicol (16.7%) were relatively high;The resistance rates of 123 farm to ampicillin (13.3%) and the apramycin (13.3%) were relatively high.The chi square test results showed that resistance rates of E.coli to florfenicol and enrofloxacin from 127 farm were significantly higher than that from 123 and 128 farms (P<0.05);The resistance rates of E.coli to amoxicillin/clavulanic acid and apramycin from 128 farm were significantly higher than that from 123 and 127 farms (P<0.05),respectively.The most of the antibiotics resistance pattern of E.coli from different farms was 1 to 2 resistant.The results showed that the drug resistance rates of bovine E.coli in Kuitun was not high,while the resistance rates to commonly used drugs such as amoxicillin/clavulanic acid and apramycin were high.It suggested that this kinds of antimicrobial drugs should be replaced or avoid using to treat bacterial diseases.In addition,the antimicrobial resistance between farms was different,indicating the farms medicine would impact the drug resistance in bacteria. 相似文献
5.
新疆奎屯地区不同团场牛源大肠杆菌耐药情况比较 总被引：2，自引：0，他引：2
为了解新疆奎屯地区不同团场牛源大肠杆菌对临床常用抗菌药物的耐药情况,比较不同养殖场之间牛源大肠杆菌的耐药差异,分别从新疆奎屯地区位于123团、127团和128团的牛场,用肛拭子在直肠采集粪样各30份,并分离大肠杆菌。采用微量肉汤稀释法,对分离出的大肠杆菌进行10种抗菌药物最小抑菌浓度的测定,通过卡方检验对不同养殖场牛源大肠杆菌耐药差异性进行比较分析。结果显示,128团对阿莫西林/克拉维酸（33.3%）和安普霉素（23.3%）耐药率相对较高;127团对氨苄西林（20.0%）、阿莫西林/克拉维酸（16.7%）和氟苯尼考（16.7%）耐药率相对较高;123团场对氨苄西林（13.3%）和安普霉素（13.3%）耐药率相对较高。卡方检验结果显示,127团对氟苯尼考和恩诺沙星的耐药率显著高于123团和128团（P<0.05）;128团对阿莫西林/克拉维酸和安普霉素的耐药率分别显著高于123团和127团（P<0.05）。不同团场多重耐药均以1～2耐为主。结果表明,新疆奎屯地区不同团场牛源大肠杆菌对多数被检药物的耐药率不高,仅对常用药物如阿莫西林/克拉维酸和安普霉素等具有较高耐药率,需在临床治疗细菌疾病时更换或避免使用此类抗菌药物。此外,各养殖场对被检抗菌药物的耐药情况不同,说明养殖场的用药极大程度影响细菌的耐药性。 相似文献
6.
为了解豫北地区规模化养殖场猪源大肠杆菌的耐药性及基因多态性,对分离的21株猪源大肠杆菌进行药物敏感实验,采用PCR技术对其耐药基因进行检测,RAPD技术进行基因多态性分析。结果表明:豫北地区规模化养殖场分离的猪源性大肠杆菌菌株对常见16种抗生素存在不同情况的耐药性。其中对四环素、红霉素、麦迪霉素、阿莫西林、磺胺异恶唑、环丙沙星、新生霉素、复方新诺明、恩诺沙星、甲氧苄啶的耐药率均为100%,对庆大霉素、洛美沙星的耐药率为85%以上,对其他药物的耐药率相对较低;PCR检测得到8种耐药基因的条带;对菌株进行RAPD分析得到7种不同的基因型。大肠杆菌极易产生耐药性,耐药基因广泛存在于耐药菌株中,但耐药表型与耐药基因之间无绝对相关性。豫北地区猪源大肠杆菌感染多重耐药十分严重,严重影响了该地区猪源大肠杆菌病的诊治和预防。 相似文献
7.
[目的]为了分析河西走廊地区犊牛腹泻致病性大肠杆菌携带毒力基因和耐药性情况,[方法]2020—2021年在河西走廊地区采集患腹泻病犊牛的粪便、肛拭子及肝脏等病料组织279份,采用人工感染试验动物、PCR方法和K-B药敏纸片法分别检测犊牛腹泻性大肠杆菌致病性、毒力因子和耐药性。[结果]结果表明,分离得到了126株大肠杆菌,其中79株犊牛腹泻性大肠杆菌能引起小鼠死亡;分离的79株致病性大肠杆菌的毒力基因crl、irp2、fimH、papC、K88、K99、stx1、stx2检测率在40.5%～100%之间,其他毒力基因检测率在15.2%～34.2%之间;分离的79株致病性大肠杆菌对氨苄西林、阿莫西林、新霉素等8种药物的耐药率在49.4%～96.2%之间,对其他药物的耐药率在5.1%～32.9%之间。[结论]从河西走廊地区患腹泻病犊牛病料组织中分离得到79株致病性大肠杆菌,这些菌株携带多种毒力基因,对临床中常用的抗菌药物产生了耐药性。 相似文献
8.
为了解河南郑州市常见宠物携带菌株组成以及耐药情况,本试验采集了郑州地区不同宠物医院患病及健康犬、猫共计76个样本的肛拭子、眼拭子、耳拭子。试验通过细菌分离培养、形态学观察、生化试验、16s rRNA基因测序完成细菌鉴定,确定分离菌株种类,采用微量肉汤稀释法测定分离菌株耐药表型。结果共分离得到大肠杆菌50株、肠球菌27株、奇异变形杆菌24株、葡萄球菌46株、绿脓杆菌4株。奇异变形杆菌耐药最为严重,对多西环素、替米考星两种药物耐药率高于90.0%;大肠杆菌对替米考星的耐药率高达94.0%,对阿莫西林耐药率为62.0%,对多西环素、多粘菌素E、庆大霉素、环丙沙星、恩诺沙星、头孢噻呋的耐药率在4.0%~24.0%之间。肠球菌对多西环素、庆大霉素、头孢噻呋三种药物的耐药率在29.6%~40.7%之间;对阿莫西林、恩诺沙星、环丙沙星三种药物的耐药率在7.4%~14.8%之间,对替米考星的耐药率为66.7%。葡萄球菌对替米考星的耐药率为39.1%,对阿莫西林、多西环素、庆大霉素、环丙沙星、恩诺沙星、头孢噻呋的耐药率均低于20.0%。上述试验结果表明:大肠杆菌和葡萄球菌在宠物菌群组成中占比较大;大肠杆菌和奇异变形杆菌的耐药情况较为严重。 相似文献
9.
为研究近年来新疆地区牛源大肠杆菌中质粒介导喹诺酮类药物耐药基因的分布及其对喹诺酮类抗生素的耐药情况,本研究于2016-2018年从新疆石河子、沙湾、奎屯、玛纳斯和伊犁5个地区12个规模化奶牛场分离出116株牛源大肠杆菌,药敏试验检测其耐药性,同时利用PCR扩增PMQR耐药基因。药敏试验结果显示,62.93%的菌株对氨苄西林耐药,耐药率最高。对链霉素、四环素、卡那霉素和恩诺沙星的耐药率依次为56.90%、54.31%、43.10%和42.24%。对头孢他啶和头孢噻肟的耐药率较低,分别为7.76%和11.21%。分离菌主要携带qnrA、qnrS和aac（6'）-Ⅰb-cr 3种耐药基因;116株大肠杆菌中有31株携带PMQR的耐药基因,检出阳性率为26.72%,其中26株仅携带1种PMQR耐药基因,占所有菌株的22.41%,4株携带2种PMQR耐药基因,占所有菌株的3.45%,1株携带3种PMQR耐药基因,占所有菌株的0.86%。综上所述,新疆地区牛源大肠杆菌质粒介导喹诺酮类药物基因主要为qnrA、qnrS和aac（6'）-Ⅰb-cr 3种,且对恩诺沙星、诺氟沙星、环丙沙星、左氧氟沙星均产生不同程度的耐药性。 相似文献
10.
为了探讨中药与抗菌药物联用对大肠杆菌耐药性的作用效果，本研究对河南部分地区采集的样品（50份）进行分离鉴定、生化试验及致病性试验，对分离鉴定后的致病性猪大肠杆菌选用12种中药采用K-B法进行耐药性检测，将筛选出来的中药与抗生素进行中西联用对致病性大肠杆菌做体外抑菌试验，并分析中西药联用对大肠杆菌的抑制作用。结果显示，采集的50份样品有23株菌符合大肠杆菌的分离培养特性和生化特性，且23株菌均为致病性大肠杆菌；通过耐药性检测，23株试验菌株对测试的中药均有不同程度的耐药性，其中试验菌株对甘草耐药率最高（82.6%），其次为生地（78.2%），而对黄柏（17.3%）和白头翁（21.7%）耐药性较低，具有一定的敏感性；体外抑菌试验结果发现，中药与抗生素联用均有不同程度的抑菌效果，其中黄柏、白头翁与抗菌药物联用的抑菌效果最明显。以上结果说明中药与抗菌药物联用不仅可以抑制大肠杆菌的耐药性，还可以延缓大肠杆菌耐药性的产生。 相似文献
11.
本试验旨在调查新疆石河子地区奶牛乳房炎源大肠杆菌的某些生物学特性及其耐药状况,以提高药物疗效,减少牛奶中药物的残留。试验从新疆石河子地区患乳房炎奶牛的乳样中分离纯化并鉴定出21株大肠杆菌,并对大肠杆菌分离株进行抗菌药物敏感性分析。结果表明,21株大肠杆菌对21种抗菌药物中的6种药物耐药率超过50%,其中最多的耐药15种,最少的耐药5种,耐药6及6种以上的菌株共占到76.19%。提示,该地区奶牛乳房炎源大肠杆菌对多种药物已产生了不同程度的耐药性,且存在严重的多重耐药情况。 相似文献
12.
对动物源大肠杆菌采用二倍稀释法对氨基糖苷类药物及其他药物进行了MIC的测定,结果显示对十种西药全部耐药。应用1/2MIC的中药提取物对耐药菌株进行了耐药性消除的初步探索研究,结果表明临床多重耐药大肠杆菌用中药提取物作用24代以后,地锦草提取物耐药消除最强,三黄汤提取物次之,对某些氨基糖苷类药物的MIC明显下降。另外,对消除前后的细菌提取质粒,扩增氨基糖苷类的耐药基因,发现随着MIC的降低,耐药基因的数量也不同程度地减少和消失。由此可见地锦草等中药提取物对可移动的耐药基因元件有一定的消除作用,对耐药基因的扩散有抑制作用。 相似文献
13.
为查明甘肃省某奶牛场发生临床型奶牛乳房炎的主要病原菌并选择治疗用敏感药物,随机无菌采集了6份临床型病牛乳样和1份大罐乳样,采用划线分离、菌落形态观察、革兰染色镜检、生化鉴定及16S rDNA序列分析等方法进行细菌分离鉴定,同时采用K-B法测定主要分离菌株对抗菌药物的敏感性。结果表明,从临床型乳房炎乳样中分离鉴定出大肠埃希菌、芽胞杆菌、凝固酶阴性葡萄球菌(腐生葡萄球菌)3种细菌,其中大肠埃希菌的分离率最高,为66.67%;从大罐奶样中也分离出大肠埃希菌。药敏试验结果表明,大肠埃希菌对氨苄青霉素、阿莫西林、头孢噻吩、杆菌肽、红霉素均存在不同程度的耐药,耐药率为29%~100%;对诺氟沙星、恩诺沙星、氟苯尼考、头孢哌酮等药物敏感。说明此次牛场临床型乳房炎的主要病原菌是大肠埃希菌、葡萄球菌和芽胞杆菌,而且分离的大肠埃希菌具有多重耐药性。根据检测分析结果,给奶牛场提出针对性的防控措施,临床型乳房炎的发病率下降,病情得以控制。 相似文献
14.
15.
本试验旨在对临床分离的猪源大肠埃希氏菌耐药基因进行初步定位。采用常规细菌分离培养、16S rRNA PCR扩增和序列测定方法从江西省3个规模化猪场送检的子宫脓液中分离鉴定病原菌,并通过质粒提取、转化大肠埃希氏菌DH5α感受态细胞及药敏试验对临床分离株的耐药基因进行初步定位。结果显示,分离鉴定到3株大肠埃希氏菌,其中JX-22分离株仅对氧氟沙星、大观霉素敏感,JX-26分离株仅对链霉素、氧氟沙星等4种药物敏感,JX-28分离株仅对氧氟沙星等3种药物敏感,均为多重耐药菌;3株大肠埃希氏菌均可纯化到分子质量大小不一的质粒。分离株、质粒转化菌及大肠埃希氏菌DH5α感受态细胞药敏试验对比结果显示,3株大肠埃希氏菌的耐链霉素、林可霉素、甲硝唑、氨苄西林、阿莫西林、大观霉素、丁胺卡那基因,JX-22和JX-26分离株的耐多西环素、氟苯尼考和复方新诺明基因,JX-22分离株的耐头孢曲松基因,JX-28分离株的耐头孢曲松、头孢噻肟、诺氟沙星基因均定位于细菌质粒上;JX-28分离株的耐多西环素、氟苯尼考和复方新诺明基因,JX-22分离株的耐诺氟沙星基因和JX-26分离株的耐头孢曲松、头孢噻肟基因均定位于其染色体上;3株分离株均无氧氟沙星耐药基因。本试验初步确定3株多重耐药猪源大肠埃希氏菌的大部分耐药基因定位于质粒上,为进一步研究猪源大肠埃希氏菌的耐药机理和有效控制措施奠定基础。 相似文献
16.
四川地区牦牛源肺炎克雷伯氏菌的分离鉴定及其耐药性分析 总被引：1，自引：0，他引：1
为了分析四川地区牦牛源肺炎克雷伯氏菌耐药性并确定其耐药基因的携带情况，本试验采集了四川地区不同养殖场患呼吸道疾病牦牛肺脏、咽拭子、鼻拭子共127份病料组织，分离得到了43株肺炎克雷伯氏菌，并采用微量肉汤稀释法结合PCR扩增法检测43株肺炎克雷伯氏菌的耐药性和耐药基因携带情况。结果表明：43株肺炎克雷伯氏菌对氨苄西林、阿莫西林、多西环素、磺胺间甲氧嘧啶4种药物耐药率较高，为65.12%~90.70%；对阿米卡星、氟苯尼考、多黏菌素B、大观霉素4种药物的耐药率在20.93%~48.84%之间；对头孢噻呋、恩诺沙星、环丙沙星3药物的耐药率在18.60%~25.58%之间；多数筛选分离得到的菌株均呈现出多重耐药性，耐9、10种药物的菌株最多，分别占分离菌株的23.3%和20.9%。通过使用PCR扩增法检测分离菌携带的耐药基因情况，结果表明：blaTEM、blaSHV、sul2、sul3、floR 5种耐药基因检出率较高，检出率在62.8%~69.8%之间；ant （3″）-Ⅰa、aph （3'）-Ⅱa、aac （6'）-Ⅰb、aacC2 4种耐药基因检出率较低，检出率在7.0%~20.9%；blaCTX-M、Mcr-1、qnrA、qnrS、rmtB 5种耐药基因未检出。综上所述，本试验中分离得到肺炎克雷伯氏菌具有较强的耐药性并携带有较多的耐药基因，为了更好的促进四川省牦牛养殖产业的发展，应注意避免滥用抗生素并通过药敏试验对症下药。 相似文献
17.
为了解四川省藏香猪源大肠埃希菌致病性、血清型及耐药性情况,从四川省藏香猪养殖场中无菌采集腹泻仔猪肝脏、肛拭子及粪便等组织病料253份中,分离得到155株大肠埃希菌。采用人工感染小鼠致病性试验、玻板凝集试验和KB药敏纸片法分别测定155株大肠埃希菌分离菌株的致病性、血清型及耐药性。结果显示,小鼠致病性试验表明155株分离菌中120株有致病性;玻板凝集试验表明120株致病性大肠埃希菌分离株属于14个血清型,以O111、O147、O109和O119为主要流行的优势血清型;耐药性试验表明120株致病性大肠埃希菌分离株对阿莫西林、氨苄西林、新霉素、磺胺间甲氧嘧啶4种药物耐药较严重,耐药率在94.2%~98.3%之间,对庆大霉素、氟苯尼考、多西环素等6种药物耐药率在44.2%~85.0%之间,对其他药物耐药率在15.0%~37.5%之间。说明该地区藏香猪源致病性大肠埃希菌血清型呈多样性分布,耐药性严重。 相似文献
18.
为探索奶牛子宫内膜炎源性大肠埃希菌耐药基因及其耐药性之间的关系。采用K-B纸片法对临床分离的54株奶牛子宫内膜炎源性大肠埃希菌进行12种抗菌药物敏感性测定,应用PCR进行这些抗菌药物相关耐药基因的检测。结果显示,54株大肠埃希菌对复方新诺明、恩诺沙星和四环素的耐药率较高,分别为67%、39%和35%。分离的54株大肠埃希菌中有41株至少含有所检测耐药基因中的1种,CyrA、CyrB、ParC和Tet耐药基因较为普遍,其耐药菌基因检出率依次为96%、83%、100%和95%,13株没有检测到相应的耐药基因。奶牛子宫内膜炎源性大肠埃希菌对常见抗菌药物耐药严重,耐药基因普遍存在于耐药菌株中,除氨基糖苷类耐药菌株,其他3种抗菌药物类型耐药表型与耐药基因检测结果有较高一致性。 相似文献
19.
Grobbel M Lübke-Becker A Wieler LH Froyman R Friederichs S Filios S 《Veterinary microbiology》2007,124(1-2):73-81
The aim of this study was to compare the in vitro antimicrobial activity of the veterinary fluoroquinolones against a panel of recently isolated porcine and bovine bacterial pathogens. The study used enrofloxacin as a benchmark against which other agents were compared, being the most common fluoroquinolone used in treatment of bovine and porcine infections. The activity of ciprofloxacin was also assessed as it is the main metabolite of enrofloxacin in cattle. Enrofloxacin and ciprofloxacin generally showed higher antibacterial activity, in terms of MIC(50) values, for most pathogen species when compared with marbofloxacin, difloxacin, danofloxacin and norfloxacin. Ciprofloxacin showed significantly greater in vitro antibacterial activity than enrofloxacin against M. haemolytica, P. multocida and E. coli, whereas enrofloxacin showed greater activity than ciprofloxacin against S. aureus. Marbofloxacin was significantly more active than enrofloxacin against M. haemolytica, E. coli and B. bronchiseptica but less active against P. multocida, S. aureus, coagulase negative Staphylococci, S. dysgalactiae, S. uberis, A. pleuropneumoniae and S. suis. Danofloxacin was significantly less active than enrofloxacin against P. multocida, E. coli, S. uberis, A. pleuropneumoniae and S. suis. Enrofloxacin and its metabolite ciprofloxacin showed the highest in vitro activities against most bovine pathogens tested and the porcine pathogens also showed a high degree of sensitivity to enrofloxacin. These data facilitate further pharmacokinetic/pharmacodynamic comparison of fluoroquinolones currently used in veterinary medicine. 相似文献
20.
CHEN Qian-qian LIU Bo WANG Jie-ping LIU Guo-hong CHE Jian-mei CHEN Zheng TANG Jian-yang 《中国畜牧兽医》2017,44(1):268-274
To investigate the distribution and characteristic of E. coli in the microbial-fermentation bed of piggery, litters with different levels of fermentation were used for the isolation, identification and drug sensitivity test of E. coli, to analyze the pathogenicity and drug susceptibility of E. coli in the microbial-fermentation bed of piggery. The results showed that, E. coli could be isolated only from litters with low degree of fermentation (0<△E≤7.63), and totally 41 strains were isolated from litters with 10-5 dilution, but none from litters with higher degree of fermentation (△E>7.63). The number of E. coli reduced along with the fermentation of litters. Among the 41 strains of E. coli, 15 were intestinal pathogenic strains, 9 of which had astA gene (22%), and 2 strains had sepA gene (4.8%). 11 strains were resistant to doxycycline, accounted for 27% of the total.The two strains containing sepA gene had strong resistance to doxycycline. In conclusion, the microbial-fermentation bed fermentation bed had a inhibitory effect on E. coli which promoted the application of fermentation bed and reusing of litters. 相似文献