排序方式: 共有18条查询结果,搜索用时 15 毫秒
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方光远 《金陵科技学院学报》1998,(2)
鸡传染性支气管炎病毒(IBV)目前已知至少有27个血清型,IBV基因组中的S1基因长度约为1.73Kb,S1基因变异性大,它与IBV的血清型有重要关系。通过对分离出的IBV进行血清型鉴定和致病机理的研究,制定正确的免疫程序和合理选用疫苗或利用自家组织灭活油乳苗对鸡进行预防接种,可有效地免疫预防鸡传染性支气管炎(IB)。 相似文献
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《Journal Of Applied Aquaculture》2013,25(3-4):231-249
ABSTRACT Aquaculture produce in Asian countries contributes a major share to total global fish production. However, disease due to biotic and abiotic factors results in considerable losses to the industry. The most frequently encountered bacterial agents associated with fish diseases in tropical environments are Vibrio sp. in marine and brackish-water systems and motile aeromonads in freshwater systems. Virulence mechanisms of these bacterial species have been widely studied. Though a few viral agents such as rhabdovirus, reo-like virus, infectious pancreatic necrosis virus, picornavirus, and irido-like virus have been recorded in different parts of Asia, such reports are scanty. Among fungal pathogens, Aphanomyces invaderis is the most virulent and has been reported to be associated with epizootic ulcerative syndrome. Other fungal agents such as Achlya sp. and Saprolegnia sp. have been recorded in various disease conditions. In addition to various conventional microbiological and serological methods, nucleic acid-based methods are being widely adopted for diagnosis of different fish diseases. Few successful vaccines have been developed to protect against disease conditions, and some of the better known ones are against vibriosis and furunculosis. Many other vaccines are still in the experimental stages. Early diagnosis of disease and development of successful vaccines are important for the future development of aquaculture. 相似文献
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王扬伟 《郑州牧业工程高等专科学校学报》1995,(1)
1992年7月下旬至8月上旬,河南省某大型鸽场发生以神经症状、绿色或白色稀便、出血性肠炎和肝肿大出血为特征的传染病,共死鸽3000羽,经病原分离鉴定和动物接种试验,确诊为多杀性巴氏杆菌和鼠伤寒沙门氏杆菌混合感染所致.随后检查多批由该场及郊县送检的病、死鸽及血清,证明了引起鸽死亡的主要传染病是鸽巴氏杆菌病和沙门氏菌病.用从病、死鸽分离的多杀性巴氏杆菌和鼠伤寒沙门氏杆菌制成二联灭活苗(下称二联苗),用副粘病毒制成副粘病毒油乳剂灭活苗,将二联苗和副粘病毒油乳剂灭活苗同时接种鸽,沙门氏菌抗休80%阳性,用巴氏杆菌和鼠伤寒沙门氏菌攻毒100%保护,副粘病毒HI几何平均值为6log_2.而未免疫组攻毒100%死亡.用以上二种疫苗免疫鸽60万余羽份,经二年多的流行病学调查和抽样检验表明,研制的疫苗安全,有坚强和持久的免疫效力. 相似文献
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为了克服锥虫抗原变异对宿主免疫反应的干扰,探索伊氏锥虫病高效保护性抗原,根据伊氏锥虫在宿主体内第一次发生变异产生的变异抗原免疫原性相同的规律,设计了伊氏锥虫变异前抗原(VSG1)和第二次变异所产生的抗原(VSG2)复合物作免疫原,对小鼠进行免疫与单用变异前抗原免疫鼠相比较,两组鼠都用带变异前抗原的虫攻击,另以未免疫的鼠作对照,结果VSG1+VSG2免疫组小鼠8只全部获得保护,单用VSG1免疫组小鼠10只和未免疫组小鼠10只血中全部出虫而死亡,前者比后者出虫时间和存活时间延长,提示运用伊氏锥虫抗原变异这一规律设计的这种免疫复合物,能激收缩主克服虫体抗原变异对免疫保护的干扰。 相似文献
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1998年在疫区内某对虾养殖场,用对虾副粘病毒细胞培养灭活疫苗,对日本和中国对虾苗(体长0.8~1cm)进行了侵泡免疫试验。对虾养殖试验结果表明,5月3日放苗后,免疫试验组对虾没有发病,其中单纯用疫苗免疫的日本对虾试验池的对虾规格,养殖73d(至7月15日)平均达95尾/kg,219d(至11月8日)平均达38尾/kg,2次出池合计平均170.9kg/km^2;单纯用疫苗免疫的中国对虾试验池的对虾规格,养殖86d(至7月28日)平均达110尾/kg,221d(至11月10日)平均达22尾/kg,2次出台合计平均167.3kg/hm^2。日本对虾和中国对虾的免疫试验对照池与非免疫试验池的对虾,分别于6月28日和7月15日发生副粘病毒病而死亡。 相似文献
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