猪大肠杆菌病的流行特点及防治

1流行特点 致病性大肠杆菌主要存在于母畜的肠道、产道及周围环境,因此,带菌母猪是本病的重要传染源。猪的大肠杆菌病主要通过消化道感染。     

犊牛大肠杆菌病的诊治

1发病特点犊牛大肠杆菌病又称犊牛下痢或犊牛白痢,由多种血清型的病源性大肠杆菌所引起的犊牛胃肠黏膜表层乃至深层的炎症,临床上主要以腹泻为主要特征。各个品种的犊牛均易感染,主要发生于1周龄至1月龄之内的犊牛,也有的在出生后没有吃到初乳就开始发病。     

猪大肠杆菌病

<正> 猪大肠杆菌病是由病原性大肠杆菌引起的仔猪一组肠道传染性疾病。常见的有仔猪黄痢、仔猪白痢和仔猪水肿病三种,以发生肠炎、肠毒血症为特征。病原本病菌为革兰氏染色阴性,无芽胞,一般有数根鞭毛,常无荚膜的、两端钝圆的短杆菌。在普通培养基上易于生长,于37℃24小时形成透明浅灰色的湿润菌落;在肉汤培养中生长丰盛,肉汤高度浑浊,并形成浅灰色易摇散的沉淀物,一般不形成菌膜。生化反应活泼,在鉴定上具有意义     

猪副猪嗜血杆菌病流行特点及综合防控

1流行特点1.1血清型多副猪嗜血杆菌有多种血清型,其至少可分为15种以上的血清型。     

猪大肠杆菌病的流行特点、临床症状、治疗和预防

猪大肠杆菌病是仔猪阶段经常发生的一种疾病,是由于感染致病性大肠埃希氏菌而导致的一种细菌性人畜共患传染病。因病菌分泌肠毒素、黏附素、水肿素或者内毒素而使病猪出现多种临床症状,如肠炎、肠毒血症、水肿等。我国各地猪场都能够出现发病,但轻重程度有所不相同。通常集中在寒冬、炎夏以及潮湿多雨季节发生,且仔猪具有较高的发病率,往往超过90%,死亡率也较高,严重损害养猪经济效益。现概述该病的防控措施,供大家参考。     

猪大肠杆菌病

<正> 细胞毒素:SLT 有3型:SLT-Ⅰ SLT-Ⅱ及 SLT-Ⅳ,目前研究发现 SLT-Ⅱ使猪产生水肿病的临床症状和病理变化。除此之外据有致病性的因子还有定植因子、直接侵袭性、大肠杆菌素。临床症状:仔猪黄痢仔猪黄痢又称早发性大肠杆菌病,是1-7日龄左右的仔猪发生的一种急性、高度致死性的疾病。临床上以剧烈腹泻、排黄色水样稀便、迅速死亡为特征。剖检常有肠炎和败血症,有的无明显病理变化。从病猪分离到的大肠杆菌有溶血性或非溶血性两类,其 O 抗原型因不同地域和时期而有变化。但在同一地点的同一流行中,常限于1～2个型。多数病原菌株都有菌毛吸着因子并产生肠毒素,已知吸着因子(也称粘     

我国近年来鸡大肠杆菌病的流行特点和防治方法

我国近年来鸡大肠杆菌病的流行特点和防治方法钟镇光谭丽屏（广州市农牧渔业局）（广州市畜牧兽医总站）致病性大肠埃希氏菌（Ｅｓｃｈｅｒｒｃｈｒａｃｏｌｉ）在鸡场里的分布十分广泛，以致大肠杆菌病（ｃｏｌｉｂａｃｉｌｏｓｉｓ）成为鸡的一种常见病和多发病，而且是...     

猪大肠杆菌病的流行情况和防制措施

猪大肠杆菌病是由致病性大肠杆菌引起的一种仔猪肠道传染病,其病死亡率高,给养猪户造成较大损失.故本文对这几种主要的猪大肠杆菌病的流行特点,流行情况及防制措施进行了阐述.     

猪大肠杆菌病的流行情况和防制措施

猪大肠杆菌病是由致病性大肠杆菌引起的一种仔猪肠道传染病,其病死亡率高,给养猪户造成较大损失。故本文对这几种主要的猪大肠杆菌病的流行特点,流行情况及防制措施进行了阐述。     

肉鸡大肠杆菌病的流行特点及防治

近期，许多养鸡户饲养的肉鸡受到了严重的大肠杆菌感染，导致死亡率升高，有的高达３０％以上，造成了巨大的经济损失。现就有关此病的一些情况简介如下，以供广大养殖户参考。１发病特点１．１发病广，死亡严重发病广，几乎所有的养殖户的肉鸡都受到了大肠杆菌的感染，无一幸免，只是发病日龄不同，感染程度有别而已。死亡严重，从大部分发病鸡群来看，日死亡率在１％以上。１．２各日龄鸡均易感染主要表现为脐炎、卵黄性腹膜炎、气囊炎等，采食减少或废绝，精神萎顿，两翅下垂，沉郁呆立，闭眼缩颈，严重口腔流粘液，拉黄白色稀粪，粘在肛…     

Experimental Colibacillosis in Gnotobiotic Baby Pigs II. Pathology

Sixty-two neonatal gnotobiotic pigs were used in three experiments to determine the lesions produced by two closely related strains of Escherichia coli O138:K81:NM (of Michigan origin) and O138:K81 (of Minnesota origin). Exposure was by subcutaneous injection of bacterial culture into the umbilical stump or by oral inoculation.

Gross signs common to monocontaminated pigs included distention of the flaccid small and large intestines with fluid contents. Edema was prominent in various tissues of most pigs exposed via the umbilical stump but not in those exposed orally.

Histological lesions were predominantly in the gastrointestinal tract and were variable. At one extreme acute hemorrhagic enteritis was present in two pigs, while at the other extreme in a few pigs it was difficult to distinguish tissues of infected pigs from those of noninfected germfree pigs. Significant histological lesions common to monocontaminates included mild inflammatory reaction, hydropic degeneration of the intestinal epithelium, evidence of interference with normal function of the villus-draining mechanisms, and vascular changes generally indicated by edema.

The findings suggest that interference with normal absorption of nutrients plays at least some role in the pathogenesis of colibacillosis in young gnotobiotic pigs.

     

规模化兔场流行大肠杆菌病的诊治

通过对一型养殖户存栏的仔兔死亡情况进行调查，结果表明本次流行的特点是，以糊状，胶冻样粪便和脱水为特征，剖检病变为胃肠道充满气液混合物，回肠内容物呈胶状半固体，表现覆有黏液，再根据生物学试验和生化试验，结果诊断为兔大肠杆菌病，通过紧急接种和抗菌药物治疗得到了控制。     

Experimental Colibacillosis in Gnotobiotic Baby Pigs I. Microbiological and Clinical Aspects

Sixty-two gnotobiotic pigs were used in three experiments to determine the means whereby two related strains of Escherichia coli colonized the intestinal tract. Pigs were exposed by a method simulating neonatal contamination of the umbilical stump. Bacteremia was produced within one and one half hours, and by 24 hours the infection was generally well established in the gastrointestinal tract. By 48 hours after exposure, the bacteremia had subsided so that only an occasional isolation from organs other than the gastrointestinal tract was made.

Oral exposure of one litter of germfree pigs produced heavy colonization of the entire gastrointestinal tract within four hours. Evidence of intermittent bacteremia was present in pigs of this litter. Diarrhea appeared earlier when pigs were exposed orally than when they were exposed by way of the umbilical stump.

     

中药肠炎康治疗猪大肠杆菌病的临床试验研究

为验证中药肠炎康[1]对猪大肠杆菌病的临床效果,对人工感染大肠杆菌猪进行治疗性试验.用大肠杆菌O301对试验组猪进行人工感染后,分为肠炎康低、中、高剂量治疗试验组,庆大霉素药物对照组和阳性对照组.结果表明,拌入饲料肠炎康(拌料10 g/kg体重 ,连用3 d)治疗猪大肠杆菌病,疗效可靠,效果明显.对人工感染引起的猪大肠杆菌病治愈率为86.7%,有效率100%,并能显著降低猪死亡率.     

复方白毛藤注射剂对仔猪大肠杆菌病的疗效研究

本试验研究了复方白毛藤注射液对大肠杆菌的体外抑菌作用和对猪大肠杆菌病的治疗效果。结果表明,该制剂对大肠杆菌的抑菌效果明显,其抑菌圈直径为(16.7±1.12)mm。该制剂对仔猪黄白痢的治疗效果显著,总治愈率为94.3％,明显高于药物对照组(P<0.01)。     

Studies of Escherichia coli in Gnotobiotic Pigs: I. Experimental Reproduction of Colibacillosis*

The successful experimental production of colibacillosis in young gnotobiotic pigs by the oral administration of E. COLI (08:K.:H21 was accomplished. Colibacillosis was not produced in gnotobiotic pigs infected with either of the 2 other strains of E.COLI employed.

Necropsy observations were presented and discussed. Emphasis was placed on the absence of grossly visible enteritis in pigs that died in the acute phase of the disease. The gross appearance of the intestinal tract changed some hours after death to resemble that associated with enteritis.

Bacteremia was detected in the gnotobiotic pigs orally infected with each of the 3 strains of E. COLI, and the special characteristics of the colostrum-deprived pig were stressed as important factors in these findings.

     

禽大肠杆菌病

禽大肠杆菌病是一种由大肠埃希氏菌或俗称大肠杆菌（图1）引起的具有传染性的疾病,该病存在于世界各地的家禽群体中。大肠杆菌可以引起皮下感染,即蜂窝组织炎,且通常可引起禽呼吸系统疾病,在严重的情况下该病会导致发病家禽出现败血症和死亡。禽大肠杆菌病主要影响4～6周龄的肉用仔鸡,是导致家禽群体大量死亡的主要原因。     

羊泰勒焦虫病的诊治

羊泰勒焦虫病有两种病原体:一是山羊泰勒焦虫,其引起的疾病一般呈恶性经过,死亡率高;另一种是绵羊泰勒焦虫,其引起的疾病呈良性经过,死亡率低.两种病原体均能感染绵羊和山羊,且两者的病原体形态,大小相似.笔者曾遇见过两起羊泰勒焦虫病(均为绵羊群)其死亡率介于两者之间,病原体为哪一种有待研究.现将诊断过程报告如下: 　　……     

猪主要传染病防疫程序

笔者在总结当地养猪场免疫经验和多年实践的基础上,探讨编制了猪主要传染病的防疫程序,供各养猪场、户参考.一般养猪场、户大多采取自繁自养的生产方式,所以多数传染病的预防免疫工作应重点从种公、母猪和仔猪期抓起抓好.具体步骤如下: 　　……