广西山羊传染性胸膜肺炎病原的分离鉴定
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摘要
山羊传染性胸膜肺炎是山羊的高度接触性传染病,临床上以高热、咳嗽、肺和胸膜发生浆液性和纤维蛋白性炎症为特点。广西近年时有疑似山羊传染性胸膜肺炎病例发生,但一直未能从病原学上确诊广西是否存在山羊传染性胸膜肺炎。
     本研究首先从流行病学上对该病在广西的状况进行了调查。广西山羊传染性胸膜肺炎多发于7-9月,主要侵害一岁左右的羊只,发病率从26.67%至56.25%,平均发病率为35.8%;死亡率从16.67%到50%,平均死亡率为27.5%。用微量间接血凝试验(MIHA)检测了广西六个地区668份山羊血清中的抗体,以Y-98为抗原的MIHA试验检测结果显示,阳性反应89头份,阳性率为13.3%(89/668)。以PG3为抗原的MIHA试验进行检测结果为:阳性125头份,阳性率为18.7%(125/668)。其中有60份血清同时检测出以上两种支原体抗体,占被检血清的8.98%(60/668)。
     采集南宁和柳州两地以呼吸道症状为主要特征的山羊病料进行了病原分离培养,在5份病料中有4份分离出支原体。分离物经纯培养、菌体和菌落形态的观察、生化试验、生长抑制试验、代谢抑制试验、动物感染试验,鉴定为丝状支原体山羊亚种(Macoplasma mycoides subsp. Capri)和绵羊肺炎支原体(Macoplasma ovipneumoniae)。首次在广西境内分离出山羊传染性胸膜肺炎病原,同时证明广西的山羊传染性胸膜肺炎由丝状支原体山羊亚种和绵羊肺炎支原体的混合感染引起。
     根据文献合成了检测丝状支原体山羊亚种和绵羊肺炎支原体的引物,对4份分离物及8个菌株和20份病料进行了检测,4份分离物均扩增出状支原体山羊亚种和绵羊肺炎支原体的基因片段。菌株GX1~#-1、GX2~#-1、GX4~#-1、GX5~#-1扩增出丝状支原体山羊亚种的基因片段;菌株GX1~#-2、GX2~#-2、GX4~#-2、GX5~#-2扩增出绵羊肺炎支原体标准株Y98的基因片段。20份疑似病料中检测有14份为阳性,6份扩增出丝状支原体山羊亚种的基因片段,10份扩增出绵羊肺炎支原体的基因片段,其中6份均扩增出两种支原体的基因片段。从分子生物学上对广西的传染性胸膜肺炎及其病原加以确诊。
     以鹿寨传染性胸膜肺炎病羊的纯分离物为菌株制作了灭活菌苗,经无菌检验、安全性试验、免疫效果试验和田间应用试验,免疫效果好,可以转入中试。
Contagious caprine pleuropneumonia (CCPP) is an highly contagious disease ofgoats, caused by Mycoplasma spp., characterized by high fever, coughing, serous andfibrinous pleuropneumonia. In the recent years, suspectable CCPP cases always happenedin Guangxi. But agents couldn't be isolated.
     In this project, firstly an epidemiological survey was performed on the status of CCPPin Guangxi. The results showed CCPP mainly happens between July to September andaffects young goats of one year old or so, the average incidence and mortality were35.8%(from 26.67% to 56.25%) and 27.5% (from 16.67% to 50%).,and 668 goat serumsamples were tested by Minim Indirect Haemagglutination test (MIHA) for detecting theAntibodies of M. ovipneumoniae and M. mycoides subsp, capri The antibody positiverate of M. ovipneumoniae and M. mycoides subsp, capri were 13.3%(89/668) and 18.7%(125/668) respectively,, and 60(8.98%) samples were both seropositive to M.ovipneumoniae and M. mycoides subsp, capri.
     4 isolates of Mycoplasma spp. were isolated from 5 samples of diseased goats mainlycharacterised by respiratory signs in Nanning and Liu Zhou. The isolates were M.ovipneumoniae and M. mycoides subsp, capri identified by morphology, culture character,biochemical tests, growth inhibition test, metabolism inhibition test and animalexperiment, .It's first time that the pathogens of CCPP were identified in Guangxi. And atthe same time, it was confirmed that CCPP was caused by M. mycoides subsp, capri, and M.ovipneumoniae together.
     PCR primers to M. mycoides subsp, capri, and M. ovipneumoniae(which gene?) werecomposed respectively according to the references. Four isolates, 8 strains and 20 sampleswere tested by PCR. Segments in genes of M. mycoides subsp, capri, and M.ovipneumoniae were amplified in all of the 4 isolates. A segment in gene of M. mycoidessubsp, capri, was amplified from strains GX1~#-1,GX2~#-1,GX4~#-1 and GX5~#-1. A segmentin gene of M. ovipneumoniae was amplified from strains GX1~#-2,GX2~#-2,GX4~#-2 andGX5~#-2. Fourteen of 20 samples were positive by PCR test. A segment in gene of M.ovipneumoniae was amplified in 10 samples and a segment in gene of M. mycoides subsp. and M. ovipneumoniae were amplified in 6 samples. CCPP in Guangxi and its agents werediagnosed by molecular biological techniques.
     Inactive vaccine of isolate from CCPP infected goat was produced and was provenqualified by sterility test, safety test, potency test and field tests. And it got good feedbacks.So it can enters the experimental stage.
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