绵羊支原体肺炎的诊治

1　发病情况　 2 0 0 1年 1月 ,靖江市郊区一养羊户从浙江省某地调进湖羊 1 0 6只 (其中母羊 1 0 1只 ,多为怀孕绵羊 ) ,入场后第 5天发现一只公羊流浆液性鼻涕 ,咳嗽 ,体温升高 ,食欲减退 ,经常反复。到第 2 0天 ,部分母羊体温升高、不食 ,后经紧急治疗 ,疫病得到有效控制 ,共     

绵羊肺炎支原体和精氨酸支原体双重PCR检测方法的建立及应用

为建立绵羊肺炎支原体和精氨酸支原体的双重PCR检测方法,本试验分别设计了绵羊肺炎支原体和精氨酸支原体的特异性引物,优化反应条件后对其特异性和敏感性进行评价,并对40份鼻拭子进行了检测。结果显示,该方法能同时扩增出绵羊肺炎支原体545 bp和精氨酸支原体806 bp的特异性片段,而对其他病原的DNA扩增均为阴性。该双重PCR方法对绵羊肺炎支原体和精氨酸支原体的最低检测限分别为100和10 pg/μL。40份鼻拭子检测结果显示,双重PCR检测方法与分离培养法符合率高达92.5%,均能鉴定出绵羊肺炎支原体和精氨酸支原体。结果表明,本研究建立的双重PCR方法可用于绵羊肺炎支原体和精氨酸支原体的临床快速诊断。     

丝状支原体簇及绵羊肺炎支原体双重PCR方法的建立及应用

为了快速检测和鉴别丝状支原体和绵羊肺炎支原体,试验采用2对检测丝状支原体和绵羊肺炎支原体的特异性引物,成功建立了一种能同时检测丝状支原体和绵羊肺炎支原体的双重PCR方法.结果表明:该方法特异性强、敏感性高,对临床病料的检测效果好.     

绵羊肺炎支原体的研究进展

文章介绍了绵羊肺炎支原体的病原特征、致病性及致病机理、疫苗研制情况,并提出加强研究的方向,为该病的防治及疫苗开发提供参考。     

从湖羊肺脏中分离绵羊肺炎支原体的鉴定

从新疆湖羊肺脏病料中分离出一株支原体XJ-3f，用其培养物人工感染80日龄健康绵羊，28d后剖杀，剖检可见肺表面肉粉色实变，显微病理变化为大灶性融合性肺炎。参考国际已知支原体16SrRNA序列，设计一对扩增700bp片段的通用引物，直接提取肺脏组织DNA进行PCR扩增并克隆、测序。将该序列与GenBank中33种支原体序列比较，结果证明该序列与绵羊肺炎支原体（M．ovipneumonia）标准株Y．98同源性为99．9％，而与山羊支原体山羊亚种（M．capricolum subsp．capricolum，Mcc）、丝状支原体山羊亚种（M．mycoides subsp．Capri，Mmc）、丝状支原体丝状亚种LC型（M．mycoides subsp．mycoides LC，M．mmLC）等同源率为81％。以感染羊血清和Y．98与从发病羊肺脏中分离出的三株支原体茵体蛋白进行Western blot，证明均与感染羊血清有特异性反应，且与Y．98相比无明显差异，故确定分离株为绵羊肺炎支原体（M．ovipneumonia）。     

绵羊肺炎支原体的培养与提纯

试验用改进的Ｈａｒｔｌｅｙ氏消化汤培养基,培养绵羊肺炎支原体效果较好,一般在菌体复苏后２４～４８ｈ即可使培养基ｐＨ值下降至６．９左右,同时建立了操作简单,省时,省力,染色效果良好的支原体复红染色法和提纯绵羊炎支原体抗原的具体方法。     

新疆石河子地区绵羊支原体肺炎流行病学调查

对石河子地区湖羊支原体肺炎进行了流行病学调查。结果表明,湖羊的发病率是20.4%,死亡率为18.2%,病死率达89.3%。同群细毛羊发病较湖羊少,波尔山羊对本病有一定的抵抗力。发病羊中以3月龄以下的绵羊较易感。该病多发生于冬春季节,即11月份到来年4月份。羊在这段时间吃不上新鲜的牧草,主要以青贮饲料为主,极易导致本病暴发流行。用间接血凝方法对135只绵羊血清进行MO抗体检测,结果湖羊MO的感染率达77.9%。     

绵羊肺炎支原体

本文主要从绵羊肺炎支原体(MO)的特性、流行病学、致病机理、临床症状、病理变化、诊断及防治等方面进行简单的概述。     

绵羊肺炎支原体与猪肺炎支原体交叉抗原研究

为了研究绵羊肺炎支原体标准株Y98与猪肺炎支原体标准株232全菌蛋白免疫原性的异同,试验采用SDS-PAGE和免疫印迹分析技术对其进行了研究,结果表明:绵羊肺炎支原体标准株Y98同猪肺炎支原体标准株232免疫印迹结果基本一致,在70,50,40,25 ku蛋白带处存在共同抗原。     

Seroepidemiological survey of sheep flocks from Northern Japan for Mycoplasma ovipneumoniae and Mycoplasma agalactiae

Sheep flocks from Hokkaido, Iwate and Aomori, three northern prefectures of Japan, were screened for antibodies to Mycoplasma ovipneumoniae and Mycoplasma agalactiae by ELISA. Sixty four animals out of 246 (26%) were seropositive to M. ovipneumoniae, with positive results obtained from all three prefectures. None of the sera tested were serologically positive to M. agalactiae.     

The prevalence of Mycoplasma ovipneumoniae and Mycoplasma arginini in the respiratory tract of sheep

Abstract

Extract

In an initial study of mycoplasmas of the respiratory tract of New Zealand sheep a number of strains of mycoplasma were recovered and identified as either M. ovipneumoniae or M. arginini (Clarke et al., 1974 Clarke, J. K., Brown, V. G. and Alley, M. R. 1974. Isolation and identification of mycoplasmas from the respiratory tract of sheep in New Zealand. N.Z. vet. J., 22: 117–121. [Taylor &; Francis Online] , [Google Scholar]). Investigations in Australia have produced evidence that M. ovipneumoniae is associated with a proliferative interstitial pneumonia in Queensland sheep (Sullivan et al., 1973 Sullivan, N. D., St. George, T. D. and Horsfall, N. 1973. A proliferative interstitial pneumonia of sheep associated with mycoplasma infection. I. Natural history of the disease in a flock. Aust. vet. J., 49: 57–62.  [Google Scholar]) and for this reason the present survey was undertaken to investigate the prevalence of mycoplasmas in the respiratory tract of sheepin New Zealand.     

绵羊肺炎支原体感染羊细胞因子的动态变化

为检测绵羊在感染绵羊肺炎支原体(MO)前后细胞因子的含量变化情况,将6只巴什拜羊和6只盘羊杂交羊人工感染MO,在感染前后分别采集静脉血,分离血清,用ELISA方法检测IL-1β、TNF-α、IL-8、IL-10及IFN-γ含量。结果显示:两组羊在感染后IL-1β浓度均升高,第21天巴什拜羊的IL-1β含量降低,且显著低于杂交羊(P0.05);感染后两组的TNF-α含量逐渐升高,第14~21天巴什拜羊TNF-α含量开始下降,且第14天显著低于杂交羊(P0.05),第21天极显著低于杂交羊(P0.01);感染后第14和21天,巴什拜羊的IL-8含量开始下降,而杂交羊则继续升高,且杂交羊IL-8含量均极显著高于巴什拜羊(P0.01);两组羊的IL-10含量在第5天达到最高,且杂交羊极显著高于巴什拜羊(P0.01),而第14和21天巴什拜羊显著(P0.05)和极显著(P0.01)高于杂交羊;感染后两组羊的IFN-γ含量逐渐升高,第14~21天,巴什拜羊的IFN-γ含量开始下降,而杂交羊则继续升高,第14和21天巴什拜羊显著(P0.05)和极显著(P0.01)低于杂交羊。结果提示:绵羊感染MO前后细胞因子变化明显,巴什拜羊和杂交羊细胞因子变化也有差异,这对研究支原体肺炎发病机理及免疫治疗有指导意义。     

Experimental infection of sheep with Mycoplasma ovipneumoniae and Pasteurella haemolytica

A group of Caesarian-derived, colostrum-deprived lambs was inoculated intranasally and intratracheally with a virulent Mycoplasma ovipneumoniae isolate selected from ovine mammary studies and propagated in an ovine mammary gland. Other groups of lambs were inoculated with M. ovipneumoniae in combination with Pasteurella haemolytica type Al or P. haemolytica alone. The M. ovipneumoniae isolate alone did not induce any specific pneumonic lesions in the lambs and when combined with P. haemolytica type Al did not increase the severity of the P. haemolytica-type lesions. Fifty percent of lambs inoculated with P. haemolytica developed a purulent and exudative bronchopneumonia with pleurisy and high titres of P. haemolytica were recovered from these lesions.     

血清中不同甘露(聚)糖结合凝集素浓度的绵羊感染绵羊肺炎支原体后免疫因子表达的变化

为研究中国美利奴羊不同甘露(聚)糖结合凝集素(MBL)浓度感染绵羊肺炎支原体(MO)的免疫因子水平变化,本研究选择血清中MBL高、低浓度的绵羊各6只(感染组和对照组各3只),感染组人工感染MO,分别在人工感染前和感染后不同时间,采用荧光定量PCR法检测血液中血清因子及补体表达水平。结果显示,不同MBL浓度的绵羊人工感染后MBL m RNA水平呈下降趋势,MBL高浓度促炎因子IL-2和IFN-γ的m RNA表达水平较高,抗炎因子IL-4的m RNA表达水平在感染后1 d升高,此后开始下降,而IL-4的m RNA水平在14 d后有所升高;MBL低浓度羊感染后其TNF-α的m RNA水平显著升高,随炎症的缓解,逐渐降低;补体C1和C3的m RNA在感染后表现出不同的变化,MO感染可以激活补体途径。本研究结果表明,低血清MBL浓度与绵羊支原体肺炎具有一定的相关性,MBL不同浓度组之间其IL-2、IL-4、TNF-α、IFN-γ、补体C1、C3水平存在差异,低浓度MBL的绵羊更易发生比较严重的炎症反应。     

The isolation of multiple strains of Mycoplasma ovipneumoniae from individual pneumonic sheep lungs.

The heterogeneity of Mycoplasma ovipneumoniae isolates from the lungs of sheep with chronic non-progressive pneumonia (CNP) from the same flock raised the possibility that multiple isolates derived from one lung were not all identical. To test this hypothesis, thirty isolates were obtained from each of six pneumonic sheep lungs at slaughter. Four lungs had relatively severe lesions and from each of these, three or four strains of M. ovipneumonia, distinguishable by REA and in most cases by SDS-PAGE, were detected. From the lungs of each of two sheep with mild lesions, two strains of M. ovipneumoniae were detected. Four isolates from one lung were further examined by restriction endonuclease analysis (REA) using many restriction endonucleases. Those which differed with EcoRI also differed when other restriction endonucleases were used. However, partial digests occurred mainly with those restriction endonucleases which recognise cytosine-rich sequences. The presence of multiple strains of one species of microorganism in individual lesions is an unusual concept which may not be limited to one disease or to one host.     

绵羊支原体肺炎中不同甘露(聚)糖结合凝集素基因型对肺组织病变的影响

为建立不同甘露(聚)糖结合凝集素(MBL)基因型绵羊支原体肺炎的动物疾病模型,本研究选择MBL外显子1中4种不同基因型共32只绵羊作为试验组,6只健康羊作为对照组,在人工感染绵羊肺炎支原体3周后全部迫杀,取肺脏组织做病理切片,以组织病理学评分确定肺部的炎症反应程度.不同MBL型绵羊的肺脏呈现不同程度病理改变,组织病理学评分结果为MBLA型和B型平均分为18.3和19.1,表现为重度病变;MBLD型平均分为12.3,为中度病变;MBL C型平均分为8.9,为轻度病变.本研究以组织病理学评分方法客观量化了不同MBL基因型肺部炎症反应的严重程度,根据评分结果推测MBL A型和B型为易感型,C型为抗性型.本研究利用组织病理学评分方法对其肺炎程度进行量化评价,为筛选绵羊支原体肺炎抗性基因型提供依据.