苏北地区规模化猪场产肠毒素大肠杆菌的分离鉴定及灭活疫苗效果评估
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国家重点研发计划(2016YFD0500800);江苏省自然科学基金优秀青年基金(BK20180075);上海市兽医生物技术重点实验室开放基金(klab201709)


Isolation, identification and evaluation of inactivated vaccine of enterotoxigenic Escherichia coli (ETEC) in large-scale pig farms in northern Jiangsu
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    摘要:

    [目的]产肠毒素大肠杆菌(Enterotoxigenic Escherichia coli,ETEC)是引起仔猪腹泻的重要病原菌,本研究通过调查苏北地区规模化猪场ETEC的流行情况,分析其生物学特性,研制具有免疫保护效果的优势血清型菌株的灭活疫苗,以期对苏北地区ETEC的防控提供参考。[方法]从苏北地区规模化猪场采集3–30日龄的仔猪新鲜粪样、肛拭子及小肠组织样,分离出ETEC,对分离菌株进行血清型鉴定、耐药性测定、小鼠致病力测定;最后通过动物免疫试验研究优势血清型菌株灭活疫苗对小鼠的免疫保护效果。[结果]从21个规模化猪场采集病料562份,通过PCR鉴定及测序得到141株ETEC;血清凝集试验鉴定出85株菌的O抗原血清型,其中O8、O101和O128为优势血清型,占定型菌株的61.2%(52/85),其他血清型包括O9、O3、O20、O148、O149等;分析141株ETEC对14种常见抗生素的耐药情况,得出分离株对新霉素、红霉素、四环素、庆大霉素、强力霉素、阿莫西林、甲氧苄啶/磺胺甲恶唑高度耐药,耐药率均高达80%以上;对恩诺沙星敏感性较高,敏感率达50.4%(71/141);对多粘菌素B和头孢噻肟中介耐药,占比分别为66%(93/141)和51.8%(73/141);多重耐药现象严重,其中10重耐药的菌株占比最大,为19%(27/141);小鼠攻毒试验测得O8血清型强毒株YC-6的半数致死量(medianlethal dose,LD50)为1.4×107CFU/只,最低致死量(minimum lethal dose,MLD)为3×107CFU/只;O8血清型强毒株YC-6和O101血清型强毒株LYG-3制备的单价灭活疫苗对小鼠的保护率均达到100%,因此利用O8血清型强毒株YC-6和O101血清型强毒株LYG-3研制二价灭活疫苗,结果显示该二价疫苗对感染不同血清型ETEC小鼠的保护率在83%以上。[结论]本研究通过对苏北地区ETEC的流行病学调查,得出其优势血清型,并研制出针对对优势血清型免疫保护效果较好的二价灭活疫苗,给临床ETEC的监测和防控提供参考。

    Abstract:

    [Objective] Enterotoxigenic Escherichia coli (ETEC) is an important pathogen causing diarrhea of piglets. In this study, the prevalence and biological characteristics of ETEC in large-scale pig farms in northern Jiangsu was investigated, and protective and inactivated vaccines of predominant serotype were developed to provide guidance and suggestions for the prevention and control of ETEC in northern Jiangsu. [Methods] Fresh fecal samples, anal swabs and small intestinal tissue samples of piglets aged 3-30 days were collected from large-scale pig farms in northern Jiangsu province, ETEC was isolated, and serotypes, antibiotic resistance, pathogenicity on mice of these isolates were determined. Finally, the inactivated vaccine of predominant serotype was developed and the immune protection effect of mice was evaluated. [Results] We collected 562 samples from 21 large-scale pig farms. We identified 141 ETEC strains containing ST or LT virulence genes by PCR. O serotypes of 85 isolates were determined by serum agglutination tests. O8, O101 and O128 were dominant serotypes, accounting for 61.2% of the confirmed strains, besides, O9, O3, O20, O148, O149 and the like were identified. The drug resistance of 141 ETEC isolates to 14 common antibiotics was analyzed. The isolates were highly resistant to neomycin, erythromycin, tetracycline, gentamicin, doxycycline, amoxicillin, and trimethoprim/sulfamethoxazole, with resistance rate higher than 80%. Strains were most sensitive to enrofloxacin, with the rate of 50.4% (71/141). 66% (93/141) and 51.8% (73/141) strains were intermediate to polymyxin B and cefotaxime. Multiple drug resistance is serious. 19% (27/141) of strains were resistant to 10 drugs. The virulence of the dominant serotype strains was obtained by mice challenge test. LD50 of one strong strain YC-6 of O8 serotype was measured as 1.4×107 CFU, while the MLD50 was 3×107 CFU. The monovalent inactivated vaccines prepared by O8 virulent strain YC-6 and O101 virulent strain LYG-3 both have a protection rate of 100% for mice. The bivalent inactivated vaccine of YC-6 and LYG-3 were developed as well, the protection rate of which in mice was more than 83%. [Conclusion] Based on the epidemiological investigation of ETEC in northern Jiangsu, dominant serotypes and drug resistance were tested, and bivalent inactivated vaccine with superior immune protection effect against isolated strains were developed, which will provide reference for monitoring and prevention in pig industry.

    参考文献
    [1] Nagy B, Fekete PZ. Enterotoxigenic Escherichia coli in veterinary medicine. International Journal of Medical Microbiology, 2005, 295(6/7):443-454.
    [2] Liu WX, Yuan CW, Meng XQ, Du YC, Gao RZ, Tang J, Shi DF. Frequency of virulence factors in Escherichia coli isolated from suckling pigs with diarrhoea in China. The Veterinary Journal, 2014, 199(2):286-289.
    [3] Yuan WZ, He KW, Lu CP, Hao QZ, Qiu XL, Zuo YZ. Progress of study on major virulence factors in Enterotoxigenic Escherichia coli. Progress in Veterinary Medicine, 2005, 26(2):6-9. (in Chinese) 袁万哲, 何孔旺, 陆承平, 郝勤宗, 裘孝良, 左玉柱. 产肠毒素性大肠杆菌主要毒力因子的研究进展. 动物医学进展, 2005, 26(2):6-9.
    [4] DebRoy C, Roberts E, Fratamico PM. Detection of O antigens in Escherichia coli. Animal Health Research Reviews, 2011, 12(2):169-85.
    [5] DebRoy C, Fratamico PM, Yan XH, Baranzoni G, Liu YH, Needleman DS, Tebbs R, O'Connell CD, Allred A, Swimley M, Mwangi M, Kapur V, Raygoza Garay JA, Roberts EL, Katani R. Comparison of O-antigen gene clusters of all of all O-serogroups of Escherichia coli and proposal for adopting a new nomenclature for O-typing. PLoS One, 2016, 11(1):e0147434.
    [6] Do T, Stephens C, Townsend K, Wu X, Chapman T, Chin J, McCormick B, Bara M, Trott DJ. Rapid identification of virulence genes in enterotoxigenic Escherichia coli isolates associated with diarrhoea in Queensland piggeries. Australian Veterinary Journal, 2005, 83(5):293-299.
    [7] Fang XH, Wang YJ, Yan YR. Serotype identification and virulence gene investigation of porcine E. coli disease in central Jiangsu. Heilongjiang Animal Science and Veterinary Medicine, 2013, (8):112-113. (in Chinese) 方向红, 王永娟, 颜友荣. 苏中地区猪大肠杆菌病血清型鉴定及毒力基因的调查. 黑龙江畜牧兽医, 2013, (8):112-113.
    [8] Wang WH, Su DP, Zhang DL, Shen HQ, Zhang XH, Chen RA, He DS. Identification and serotype distribution of pathogenic porcine Escherichia coli in South China. Chinese Journal of Veterinary Medicine, 2013, 49(4):33-34. (in Chinese) 王文豪, 苏丹萍, 张丹琳, 申翰钦, 张显浩, 陈瑞爱, 贺东生. 华南地区致病性猪大肠杆菌的鉴定和血清型分布. 中国兽医杂志, 2013, 49(4):33-34.
    [9] Wang ZL, Duan YQ, Wang JQ, Wang Y. Detection of serotypes and virulence factors of Escherichia coli from piglets in Beijing. China Animal Husbandry & Veterinary Medicine, 2017, 44(5):1302-1308. (in Chinese) 王振玲, 段跃强, 王金秋, 王宇. 北京地区仔猪大肠杆菌血清型鉴定及其毒力因子检测. 中国畜牧兽医, 2017, 44(5):1302-1308.
    [10] Yan YR, Fang XH, Wang LL. Drug resistance and drug resistance genes of porcine Escherichia coli in central Jiangsu. Chinese Journal of Veterinary Medicine, 2016, 52(2):90-92. (in Chinese) 颜友荣, 方向红, 王琳琳. 苏中地区猪大肠杆菌的耐药性与耐药基因的试验. 中国兽医杂志, 2016, 52(2):90-92.
    [11] Xie YP, Yang W, Chen ZX, Xu LG, Xuan XB, Hu S, Li SL. Investigation on serotypes and antibiotic resistance of swine pathogenic E. coli in Guangxi. Guangxi Agricultural Sciences, 2010, 41(4):380-382. (in Chinese) 谢永平, 杨威, 陈泽祥, 许力干, 禤雄标, 胡帅, 李素兰. 广西地区猪大肠杆菌血清型调查及耐药性检测. 广西农业科学, 2010, 41(4):380-382.
    [12] Shu L, Wan L, Zhang Q, Ma L, Xie ZY, Yang Y, Guo L, Yan QG. Isolation, identification and drug resistance monitoring of Escherichia coli from some large-scale pig farms in Sichuan. Chinese Journal of Veterinary Medicine, 2012, 48(3):32-34. (in Chinese) 舒蕾, 万莉, 张琦, 马磊, 谢智勇, 杨映, 郭玲, 颜其贵. 四川某些规模化猪场大肠杆菌的分离鉴定及耐药性监测. 中国兽医杂志, 2012, 48(3):32-34.
    [13] Begum YA, Talukder KA, Azmi IJ, Shahnaij M, Sheikh A, Sharmin S, Svennerholm AM, Qadri F. Resistance pattern and molecular characterization of Enterotoxigenic Escherichia coli (ETEC) strains isolated in Bangladesh. PLoS One, 2016, 11(7):e0157415.
    [14] Tuem KB, Gebre AK, Atey TM, Bitew H, Yimer EM, Berhe DF. Drug resistance patterns of Escherichia coli in Ethiopia:a meta-analysis. BioMed Research International, 2018, 2018:4536905.
    [15] Ding Y, Tang XB, Lu P, Wu B, Xu ZF, Liu WG, Zhang RX, Bei WC, Chen HC, Tan C. Clonal analysis and virulent traits of pathogenic extraintestinal Escherichia coli isolates from swine in China. BMC Veterinary Research, 2012, 8:140.
    [16] Wang SH, Niu CL, Shi ZY, Xia YJ, Yaqoob M, Dai JJ, Lu CP. Effects of ibeA deletion on virulence and biofilm formation of avian pathogenic Escherichia coli. Infection and Immunity, 2011, 79(1):279-287.
    [17] Wang SH, Xia YJ, Dai JJ, Shi ZY, Kou YH, Li HQ, Bao YL, Lu CP. Novel roles for autotransporter adhesin AatA of avian pathogenic Escherichia coli:colonization during infection and cell aggregation. FEMS Immunology & Medical Microbiology, 2011, 63(3):328-338.
    [18] Raetz CRH, Whitfield C. Lipopolysaccharide endotoxins. Annual Review of Biochemistry, 2002, 71:635-700.
    [19] Lerouge I, Vanderleyden J. O-antigen structural variation:mechanisms and possible roles in animal/plant-microbe interactions. FEMS Microbiology Reviews, 2002, 26(1):17-47.
    [20] Wang L, Wang Q, Reeves PR. The variation of O antigens in gram-negative bacteria//Wang XY, Quinn PJ. Endotoxins:Structure, Function and Recognition. Dordrecht:Springer, 2010:123-152.
    [21] Wang BN, Gong G, Wang G, Huang XJ, Zhang X, Qiangba YZ, Suolang SZ. Preparation and effect evaluation of the adjuvant vaccine of enteropathogenic Escherichia coli in Tibetan piglets. Chinese Journal of Zoonoses, 2018, 34(1):73-78. (in Chinese) 王保宁, 贡嘎, 王刚, 黄筱均, 张璇, 强巴央宗, 索朗斯珠. 藏仔猪致病性大肠杆菌疫苗的制备及效果评价. 中国人兽共患病学报, 2018, 34(1):73-78.
    [22] Yang L, Li DM, Wu WH, Pan SH, Yuan C, Huang KR, Wei XC, Xiao MC, Yang SK. Preparation of multivalent inactivated vaccine for local pig Escherichia coli strain in Guizhou. China Animal Husbandry & Veterinary Medicine, 2010, 37(12):151-153. (in Chinese) 杨莉, 李道敏, 吴位珩, 潘淑惠, 袁灿, 黄开荣, 魏锡开, 肖明才, 杨胜坤. 贵州猪大肠杆菌本地株多价灭活疫苗的研制. 中国畜牧兽医, 2010, 37(12):151-153.
    [23] Zhang YG, Gao R, Yang LL. Preparation of multivalent inactivated vaccine against swine colibacillosis. Chinese Journal of Animal Husbandry and Veterinary Medicine, 2007, (4):97. (in Chinese) 张永国, 高睿, 杨丽丽. 猪大肠杆菌病多价灭活疫苗的研制. 畜牧兽医科技信息, 2007, (4):97.
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杨德鸿,张鹏,于沛欣,任建鸾,李德志,王娟芳,孙建和,汤芳,戴建君. 苏北地区规模化猪场产肠毒素大肠杆菌的分离鉴定及灭活疫苗效果评估[J]. 微生物学报, 2020, 60(2): 261-272

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  • 收稿日期:2019-03-30
  • 最后修改日期:2019-05-30
  • 在线发布日期: 2020-02-13
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