Edwardsiella tarda infection in cultured Ya‐fish,Schizothorax prenanti,in China          下载免费PDF全文

Yan Zhou  Yi Geng  Kai‐Yu Wang  Xiao‐Li Huang  De‐Fang Chen  Xi Peng  Zhi‐Jun Zhong  Zheng‐Li Chen 《Aquaculture Research》2016,47(7):2349-2354

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Edwardsiella ictaluri bacteraemia elicits shedding of Aeromonas hydrophila complex in latently infected channel catfish, Ictalurus punctatus (Rafinesque)     

K E Nusbaum  & E E Morrison 《Journal of fish diseases》2002,25(6):343-350

Edwardsiella ictaluri is a primary bacterial pathogen of channel catfish, Ictalurus punctatus, and the causative agent of enteric septicaemia of catfish . Edwardsiella ictaluri is known to gain entry to the host by infection of the nares, gastrointestinal tract, and gills, and to disseminate to organs via an as yet uncharacterized acute bacteraemia. In this study, fluorescent microscopy showed E. ictaluri on the gill within 5 min of immersion challenge and E. ictaluri could also be isolated from the circulation within 5 min. When removed to clean water, catfish cleared circulating bacteria within 15 min and the blood remained free of E. ictaluri until its reappearance at the 12 h post-infection sampling. However, Aeromonas hydrophila , the aetiological agent of motile aeromonad septicaemia, appeared within the circulation 7 h post-challenge with E. ictaluri and was detected in all fish at 12 h post-infection. Only 20% of fish carried A. hydrophila in the trunk kidney that could be detected by plate culture on Rimler–Shotts agar; however, 100% of challenged and stress-control fish were A. hydrophila complex positive at 24 h post-challenge. These results suggest that although the catfish is capable of clearing its circulation of E. ictaluri , superinfection with latent A. hydrophila may enhance clinical signs of edwardsiellosis. This is the first report of a bacterial superinfection appearing in fish.  相似文献   

Multiplex nested-polymerase chain reaction for the simultaneous detection of Aeromonas hydrophila, Edwardsiella tarda, Photobacterium damselae and Streptococcus iniae, four important fish pathogens in subtropical Asia     

Chin-I Chang  Chia-Che Wu  Ta Chih Cheng  Jyh-Ming Tsai  & King-Jung Lin 《Aquaculture Research》2009,40(10):1182-1190

A multiplex nested-polymerase chain reaction (PCR)-based (m-nested PCR) method was developed for simultaneous detection of four important freshwater/marine fish pathogens in subtropical Asia, including Aeromonas hydrophila, Edwardsiella tarda, Photobacterium damselae and Streptococcus iniae . The specificity of the oligonucleotide primers used for PCR detection was confirmed to generate specific amplicons for the corresponding pathogens. Moreover, non-specific amplicons were observed when the primers were tested using pure DNA extracted from 31 related bacterial strains belonging to 23 species or tissue homogenates of infected tilapia. This m-nested PCR approach could detect 19 colony forming unit (CFU) for A. hydrophila , 62 CFU for E. tarda , 280 CFU for P. damselae subsp. piscicida and 179 CFU for S. iniae in infected tilapia kidney homogenates, consistent with the results derived from bacteriological methods. The assay described in this paper is a sensitive and effective method for simultaneous detection of multiple fish pathogens.  相似文献   

广西斑点叉尾鮰爱德华氏菌的分离鉴定   总被引：3，自引：0，他引：3  

邓显文  谢芝勋  刘加波  谢丽基  庞耀珊  谢志勤  董建宝  黄伟德  刘远新 《广西农业科学》2008,39(2):231-235

在广西2处网箱和2处池塘发病斑点叉尾鮰中分离到4株呈β溶血的革兰氏阴性杆菌,经细菌形态、培养特征、生理生化特性鉴定3株为钻鱼爱德华氏菌、1株为迟钝爱德华氏菌,通过PCR检测、PCR产物核苷酸序列测序及Blast比对,进一步确定3株为钻鱼爱德华氏菌、1株为迟钝爱德华氏菌;致病性试验结果显示,这4株分离菌株具有较强的致病性,能引起斑点叉尾鮰发生爱德华氏菌病;药敏试验结果显示,4株分离菌株对氧氟沙星、恩诺沙星、氟苯尼考、氟哌酸等高度敏感。  相似文献   

嗜水气单胞菌、爱德华氏菌灭活菌苗免疫保护及药物治疗试验   总被引：1，自引：0，他引：1  

邓显文  谢芝勋  刘加波  谢志勤  谢丽基  庞耀珊 《广西农业科学》2010,41(3):266-269

嗜水气单胞菌、爱德华氏菌培养物经甲醛灭活后,制成灭活油乳剂苗、灭活菌苗、饵料吸附型疫苗,免疫罗非鱼2周后,分别以嗜水气单胞菌、爱德华氏菌活菌液攻毒,结果显示,注射型疫苗均优于口服型,其中嗜水气单胞菌以腹腔注射0．1mL嗜水气单胞菌灭活菌苗＋0．3mL生理盐水的效果最佳,免疫保护率为85．0％;而爱德华氏菌以腹腔注射0．4mL灭活油乳剂苗效果最佳,免疫保护率为90．0％。两者的药物治疗试验结果显示,以氟苯尼考、恩诺沙星、环丙沙星、氟哌酸治疗罗非鱼嗜水气单胞菌病、爱德华氏菌病均有一定效果,对减少发病率及死亡率、控制病情具有较好作用,其中以氟苯尼考的疗效最佳,其用量为20mg／kgH2O。  相似文献   

氟苯尼考单用及联用对爱德华氏菌的体外抑菌试验   总被引：1，自引：0，他引：1  

陈福艳  黄婷  张彬  陈明  雷爱莹  梁万文 《广西农业科学》2010,41(8):841-844

为进一步了解爱德华氏菌的药物敏感性,采用肉汤稀释法测定氟苯尼考、恩诺沙星、多西环素、环丙沙星、大黄、黄连、连翘、黄芩等8种药物单用或分别与氟苯尼考联用对斑点叉尾鮰爱德华氏菌的最小抑菌浓度（MIC）,并计算氟苯尼考与其他7种药物联用的抑菌浓度指数（FIC）。结果表明,8种药物体外单用对爱德华氏菌均具较强杀菌能力,其MIC依次为：氟苯尼考0.13μg/mL、环丙沙星0.03μg/mL、恩诺沙星0.25μg/mL、多西环素0.31μg/mL、黄芩13.33mg/mL、连翘20.00 mg/mL、黄连30.00 mg/mL、大黄33.33 mg/mL;药物联用时,氟苯尼考分别与多西环素、黄连联用时呈相加作用;分别与恩诺沙星、环丙沙星、大黄、连翘及黄芩联用则均呈无关作用。  相似文献   

7种常用渔药及组合对致病性鮰爱德华氏菌的体外抗菌试验   总被引：1，自引：0，他引：1  

张彬  黄婷  陈福艳  陈明  余晓丽  梁万文 《西南农业学报》2011,24(2)

为探讨7种常用抗菌渔药对致病性鮰爱德华氏菌的体外抗菌作用,采用2倍稀释法测定了7种渔药对致病菌的最低抑菌浓度(MIC)和最低杀菌浓度(MBC),在初筛MIC的基础上,以MIC、5倍MIC、10倍MIC和20倍MIC下平板抑菌圈直径为参数,分别比较5种药物抗菌效果并优化最佳参数;利用优化的最佳参数比较5种药物单独用药与联合用药对鮰爱德华氏菌的抑菌效果.结果表明,抗菌先锋对鮰爱德华氏菌的MIC和MBC最小,分别为3.2和6.4μg/mL,其次是伯乐立康,分别为12.8和25.6μg/mL,而鱼康和肠炎烂鳃灵的浓度为1638.4μg/mL时仍无抗菌效果;5倍MIC下抑菌圈直径为筛选抗菌药物的最佳参数,5倍MIC下,鮰爱德华氏菌对抗菌先锋高度敏感,对伯乐立康、菌必清、菌毒康和海鱼安中度敏感;菌必清+抗菌先锋的联合抗菌效果最佳.  相似文献   

日本鳗鲡肝肾病原菌及其防治中药的研究     

韩金钢  关瑞章  黄文树  靳恒  郭松林 《厦门水产学院学报》2011,(5):327-334

从发病日本鳗鲡（Anguilla japonica）的肝脏和肾脏分离到优势菌并命名为AJL01,经人工感染试验证实该菌为引起日本鳗鲡肝肾病的病原菌,其半数致死量为2.6×103 cfu/g;通过菌体、菌落形态特征、GYZ-15EV鉴定系统和16S rDNA同源性等综合鉴定分析,确认AJL01为迟钝爱德华氏菌（Edwardsiella tarda）;采用五倍子、大黄、石榴皮、虎杖、黄芩5种中药单用及其两两配伍组成的10种复方对该菌进行抑菌试验,结果显示：单用时均可抑（杀）该菌,抑菌浓度（MIC）和杀菌浓度（MBC）相同,均为0.5～3.0 mg/mL;10种复方中6种呈现显著协同或协同作用,其中大黄＋石榴皮、石榴皮＋虎杖、五倍子＋大黄3种复方可显著协同抑制该菌生长,FIC〈0.5,MIC和MBC均不大于0.47 mg/mL.  相似文献   

四重荧光定量PCR技术用于食品中4种肠道致病菌的检测     

赵冉  ;陈琼  ;孔繁德  ;徐淑菲  ;杨涛  ;许淑娟 《经济动物学报》2014,(3):161-167

用已建立的四重荧光PCR方法、传统国标或行标方法、MALDI Biotyper高通量微生物鉴定法(基质辅助激光解析电离飞行时间质谱法)对随机抽取的14份食品样品进行检测,比较3种检测方法的匹配性。并用四重荧光PCR对农贸市场、大型超市采集的10类食品共205份样品进行检测。旨在研究四重荧光PCR法在食品中检测沙门氏菌、弗氏枸橼酸杆菌、奇异变形杆菌和迟缓爱德华菌的应用及食品中这4种菌的污染情况。在205份食品样品中,受污染的食品有110份,污染率53.66%(110/205),同时检出两种及两种以上致病菌的样品有62份,占污染样品的56.36%(62/110)。迟缓爱德华菌大肠菌、弗氏枸橼酸杆菌、奇异变形杆菌、沙门氏菌的检出率分别为7.80%(16/205)、53.66%(110/205)、26.34%(54/205)、5.85%(12/205)。在这3种检测方法中,四重荧光PCR的特异性好、准确性高,操作简便省时,更适用于食品中4种致病菌的快速检测。抽检的食品样品中存在这4种菌的污染,尤以生禽畜肉和水产品污染严重,需加强对食品加工、流通环节的卫生监管和监测。  相似文献   

福建爱德华氏菌对土霉素、氯霉素和链霉素的感受性、耐药性研究   总被引：4，自引：4，他引：4  

陈昌福  毛芝娟  王敏 《淡水渔业》1996,26(3):3-6

本研究在试管内测定福建爱德华氏菌对土霉素、氯霉素和链霉素的最小抑菌浓度分别为５０ｕｇ／ｍｌ，３．１２ｕｇ／ｍｌ和０．３９ｕｇ／ｍｌ。在２５℃下经药物浓度递增继代培养，该菌株对这３种抗生素的最小抑菌浓度分别上升了１６倍，３２倍和６４倍。而对已获得耐药性的菌株进行无添加药物继代培养９次、１２次和１１次后，对土霉素、氯霉素和链霉素的敏感性又回复到了初始水平。  相似文献