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猪水肿病是生猪养殖过程中较为常见的急性致死性传染病,其病原为特定血清型产类志贺毒素的大肠埃希菌,多发生于断奶2周内的仔猪群中.患病的仔猪表现为全身水肿和神经症状,该病严重影响仔猪的繁殖成活率和生猪养殖场的经济效益.本文介绍了猪水肿病的发病原因、临床症状、诊断方法以及综合防治措施,以供参考. 相似文献
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仔猪水肿病是由某些溶血性大肠杆菌引起的断奶仔猪的肠毒血症,对断奶仔猪危害较严重。1病原大肠杆菌有多种菌株,大多数菌株有产生毒素的能力,并能溶解绵羊红细胞,在鲜血琼脂上出现β型溶血环是其特征。2流行病学本病分布广泛,呈地方性流行,无季节性,病程短,死亡率较高。主要发生于断奶后1~2周或30~100日龄仔猪。典型的水肿病在生长快、表面健康的仔猪中多见,经常一窝仔猪中发育最好的易感。病程4~14d,平均不到1周,个别病例病程不超过3d,大多数有临床症状的感染猪在24h内死亡。某些应激因素也可诱发仔猪水肿病的发生。如免疫后气候突变,运输… 相似文献
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选择东北三省的锦州、丹东、盘锦、阜新地区自然发生仔猪水肿病的病例,共分离出96株仔猪水肿病大肠杆菌。对其中的12株菌进行生化鉴定、血清型鉴定和致病性检测。生化鉴定结果:12株菌均符合大肠埃希氏菌生化特征。血清型鉴定结果:12株菌分别为O139、O138、O141、054和048五种血清型,主要为O139、O138和O141三种血清型。致病性检测的结果:菌液、毒素对小白鼠攻毒,结果表明对小白鼠有较强的致病性,引起小白鼠死亡,剖检见相关器官水肿;菌液、毒素对猪攻毒试验结果表明感染断奶仔猪,各病变脏器均分离到大肠杆菌,各方面特性均与所攻毒菌株一致。 相似文献
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用小鼠复制仔猪水肿病的模型试验 总被引：3，自引：0，他引：3
以幼鼠和成年鼠为试验动物 ,分别经腹腔注射细菌或外毒素。试验结果表明 ,注射细菌后能够导致成年鼠死亡的最小细菌数为 2×1 0 10 ,成年鼠注射细菌后 1 2～ 96 h死亡 ,剖检死亡鼠可见皮下、淋巴结、肝、脾和肺脏出血 ,十二指肠和胃壁水肿。幼鼠注射细菌后 1 2～ 48h死亡 ,导致幼鼠死亡的最小细菌数为 3× 1 0 9,死亡鼠剖检结果与成年鼠相同 ;注射外毒素后 ,成年鼠出现典型的神经症状 ,最后死亡。致成年鼠死亡的毒素最小剂量为 1 m L,注射外毒素后 1 2～2 8h死亡。剖检死亡鼠可见皮下胶冻样水肿 ,皮下淋巴结出血水肿 ,脏器表面多汁 ,胃肠壁水肿 ,十二指肠和胃底壁尤其严重 ,积聚大量黄色黏稠液体。幼鼠注射外毒素后 4～ 2 8h死亡 ,其神经症状和死亡剖检结果与成年鼠基本相同 ,水肿病变更典型。本研究结果表明 ,细菌外毒素是引起水肿病的关键性因子 ,小鼠可作为诊断仔猪水肿病模型 相似文献
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从各地发生水肿病的仔猪的脏器中分离到36株细菌,通过菌体形态、菌落形态、革兰氏染色特性、生化特性、血清型等一系列的鉴定,确认为大肠埃希氏菌,从而确定了引起仔猪水肿病的主要血清型,为今后的防治提供了依据。动物致病性试验表明,该菌对小鼠有较强的致病性,可引起小鼠死亡。肉汤培养物无菌滤液能致死小鼠且剖检见相关脏器水肿,引起细胞死亡。 相似文献
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<正>1猪水肿病猪水肿病是由大肠杆菌引起的仔猪的一种急性、致死性传染病,其发病率10%~35%,发病后仔猪表现为先腹泻、后便秘,眼睑、颈部、腹部等皮下水肿,并出现肌肉震颤、四肢麻痹和划水等神经症状,由于临床发病迅速,病程短,治疗效果不佳,发病猪往往以死亡为转归,给养猪生产带来巨大的经济损失,且该病血清型众多,目前缺乏有效的疫苗用于免疫,因此本文结合养猪生产,从管理角度出发,分析了疾病病因,并提出了 相似文献
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猪伪狂犬病是由伪狂犬病毒引起的急性、热性、高度传染性疾病。仔猪水肿病是由特殊血清型的溶血性大肠杆菌在肠道内大量繁殖产生毒素被机体吸收后引起的病症。某猪场发生了神经症状,同时伴有 相似文献
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The median lethal dose of botulinum serotype E in 5.3-g channel catfish Ictalurus punctatus fingerlings was determined. Five tanks (five fish/tank) were assigned to each of the following treatment groups: 70, 50, 35, 25, or 15 pg of purified botulinum serotype E. Fish were injected intracoelomically and observed for 96 h. Administration of the toxin resulted in initial hyperactivity followed by erratic swimming, paresis, and death. The cumulative mortality by treatment group was 100% at 70 pg, 96% at 50 pg, 100% at 35 pg, 88% at 25 pg, and 56% at 15 pg. The median lethal dose was calculated as 13.7 pg/fish (equivalent to a 0.81 median lethal dose for mice Mus musculus) using a logistic regression model. All fish were necropsied; lesions included exophthalmia, ascites, splenic congestion, intussusception of the intestines, congested spleen, and blanching of the intestinal tract. The resultant clinical signs and lesions were similar to those noted in the syndrome of visceral toxicosis of catfish. This study indicates that channel catfish are more sensitive to the effects of botulinum serotype E than laboratory mice, and the signs and lesions of visceral toxicosis of catfish were replicated by injecting catfish with the toxin. 相似文献
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从陕西省某羊场发生腹泻羔羊的肝脏和脾脏分离到一株细菌,通过培养特性、茵体形态、菌落特征、染色特性、生化试验等一系列的系统鉴定,确定为致病性大肠埃希菌。动物致病性试验表明,该菌对小白鼠有较强的致病性,引起其死亡。毒素试验表明,分离菌产生致小白鼠死亡的外毒素。血清学鉴定该茵血清型为O114。药敏试验表明,该茵对大观霉素、头孢噻肟等高度敏感,对米诺环素、克林霉素、克拉霉素等不敏感。分离茵制成铝胶佐剂灭活苗免疫羊群,能有效的预防该羊场羔羊腹泻的发生。 相似文献
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Ito T Tsuchiya K Osawa S Shibata H Kanda N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(9):997-1000
Ribosomal RNA gene (rDNA) loci of Russian Mus musculus musculus and of Japanese Mus musuculus molossinus were mapped by double color FISH. The total number of rDNA loci was varied from 5 to 12, although the loci on chromosomes 12, 15, 16, 18, and 19 were common to all mice examined. Instead, polymorphisms of the rDNA loci were found on chromosomes 1, 5, 8, 9, 10, 11, 13 and 17. The novel rDNA loci of M. m. musculus were found in Nov/TUA strain on chromosomes 8 and 17. These observations, together with those of previous reports, suggest that the rDNA loci of Mus musculus species are in the evolutionary process of further translocation to other chromosomes. 相似文献
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Safety and immunogenicity of a vaccine bait containing ERA strain of attenuated rabies virus. 总被引：5，自引：5，他引：0 
下载免费PDF全文
下载免费PDF全文 K F Lawson J G Black K M Charlton D H Johnston A J Rhodes 《Canadian journal of veterinary research》1987,51(4):460-464
Ninety percent of foxes fed commercial ERA vaccine in a specially designed bait developed rabies serum neutralizing antibodies. The vaccine bait did not cause clinical signs of rabies when consumed by foxes, raccoons, skunks, dogs, cats, cattle and monkeys. When presented, in the laboratory, to wild rodents of the species Microtus, Mus musculus and Peromyscus, the vaccine baits caused vaccine-induced rabies only in Mus musculus. Laboratory mice of the CD-1 and CLL strain were susceptible to vaccine-induced rabies; however, studies showed that transmission of virus to other animals did not occur. These studies suggest that the vaccine bait described could be useful in a rabies control program in areas where foxes and wild dogs are the principal vectors. 相似文献
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M Mochizuki T Tamazumi A Kawanishi T Azuma T Shimizu 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(5):963-968
During a virus survey carried out in the period 1989-90 with 148 fecal samples collected from cats in Japan, three reovirus strains were isolated in feline cell cultures. Two strains (Nos. 114 and 140) were from 48 diarrheal fecal samples and another strain (No. 32/41) was from 100 normal fecal samples. The strains grew in feline and simian cell cultures with producing typical intracytoplasmic inclusion bodies in which virus particles were densely packed. All strains, especially Nos. 32/41 and 140 strains, showed trypsin-dependent growth in vitro. Their ultrastructural and genomic properties were characteristic of genus reovirus in the Reoviridae. All strains agglutinated erythrocytes of human type O but not of bovine. Although they were identified as serotype 2 by hemagglutination-inhibition test with the hyperimmune sera against human reovirus prototype strains, No. 114 strain was typical and the other two strains were atypical serotype 2 reoviruses. Furthermore, from the reason that Nos. 32/41 and 140 strains possessed some common properties though derived from cats in distant locations, they were considered to be reoviruses having been maintained in the cat population. Seroepizootiologic survey revealed that the prevalence of serotype 3 infection was most widespread and serotype 2 was least among three serotypes of reovirus in a cat population. 相似文献
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青海省互助县某羊场藏系绵羊患病死亡,伴有腹泻、神经症状,为快速确诊发病原因,及时防控和治疗,采集病羊样品5份,通过镜检、细菌分离培养、分子生物学试验及致病性试验进行病原鉴定分析。结果证明此次病原菌为羊致病性D型魏氏梭菌,毒素基因分析显示该菌同时含有α和ε两种毒素基因,动物致病性试验结果表明该菌对昆明系小鼠具有较强的致病性,并从试验致死的小鼠中分离到与藏羊病原相一致的细菌。三种基因的遗传进化树显示,该菌具有较强的多样性。研究确定了本次藏羊致死的主要病原为D型魏氏梭菌,结果可为该羊场梭菌病的治疗和预防提供科学依据。 相似文献
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鸭黄病毒病为近年来新发的鸭病,给养鸭业带来了极大的经济损失。为了深入研究本病的防制,本试验对鸭黄病毒(duck flavivirus,DFV)进行了分离鉴定。取疑似感染DFV的病鸭病料,经细菌分离初步排除细菌感染后,应用RT-PCR检测呈现DFV阳性,处理后将其接种到鸭胚成纤维细胞(DEF)和健康鸭胚上进行病毒分离传代。结果显示,在DEF细胞上第1代48 h就开始出现CPE,随着时间的延长CPE更加明显,通常在72~96 h产生典型CPE;接种鸭胚每一代均出现死亡,且死亡时间多集中于接种后60~72 h,死亡鸭胚胚体水肿、出血、发育不良、胚肝严重出血、肿胀或斑驳样坏死等病变。将病毒DEF细胞和鸭胚分离物应用血凝试验、毒价测定、病毒中和试验、RT-PCR及人工感染试验进行检测鉴定,证明所分离到的病毒为DFV,并将其命名为DFV SDbz株。 相似文献
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2018年9月广西某羊场部分山羊发生流涕、咳嗽、呼吸困难和体温升高等临床症状的疾病,为确诊发病原因并提供治疗方案,采用病原分离培养、PCR扩增鉴定的方法进行诊断,并对分离菌进行生化鉴定、致病性试验和药敏试验。结果显示,病料在血平板有圆形的小菌落生长,革兰阴性小球短杆菌,而在PPLO培养基上不生长;病料的PCR扩增结果显示绵羊肺炎支原体和多杀性巴氏杆菌均为阳性;所分离到的病原菌经生化鉴定,该菌符合多杀性巴氏杆菌的特性;用多杀性巴氏杆菌种属和D型多杀性巴氏杆菌特异性引物扩增为阳性;致病性试验显示该菌对小鼠有很强的致病性;药敏试验显示该菌对头孢他啶、头孢噻肟、氧氟沙星高度敏感,对复方新诺明、强力霉素、红霉素、青霉素为耐药。结果表明该病是由绵羊肺炎支原体和D型多杀性巴氏杆菌混合感染引起。 相似文献
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猪胸膜肺炎放线杆菌浊度与细菌计数的关系 总被引：2，自引：0，他引：2
为了弄清猪胸膜肺炎放线杆菌生长特性、细菌悬液浊度与细菌计数的关系,从而也为探讨细菌致病机理及指导临床上细菌疫苗的生产等提供参考依据,利用地方流行优势菌株APP-7型,将其于TSB液体培养基中培养14 h,按1 h间隔动态取样,测定菌悬液的浊度值(OD630)并用平板法进行活菌计数。结果表明:细菌在接种后2 h进入对数生长期,并持续约3 h,然后进入稳定期。对细菌浊度和细菌计数进行相关性统计分析,发现两变量间存在着极显著相关(P<0.01),以细菌浊度为X,细菌数为Y,建立了曲线回归方程,即:Y=9.817×1014X5.817。 相似文献