共查询到19条相似文献,搜索用时 978 毫秒
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<正>随着生物技术的发展,新一代疫苗包括合成肽疫苗、基因工程疫苗等新型疫苗不断涌现,但是现代疫苗研究过程中遇到的关键问题是其免疫原性弱,必须由佐剂来克服,因此免疫佐剂的研究越来越受到人们的关注。免疫佐剂也称佐剂或抗原佐剂,是一类单独使用时一般无免疫原性,但与抗原物质合并使用时能增强抗原物质免疫原性,增强机体免疫应答,或改变机体免疫应答类型的物质。1925年,法国兽医免疫学家Ranmon发现 相似文献
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从感染率90%以上的阳性牛血中分离温氏附红细胞体,利用反复冻融-超声波裂解法制备温氏附红细胞体抗原蛋白悬液,通过切胶纯化和免疫印迹法筛选具有良好免疫原性的抗原组分,制备温氏附红细胞体亚单位疫苗,并同时将抗原悬液灭活后制成温氏附红细胞体灭活苗。疫苗经检测合格后在小鼠动物模型上进行免疫持续期测定和免疫效力检验。结果显示,温氏附红细胞体亚单位疫苗对小鼠的免疫持续期为12周,免疫保护率为100%,灭活苗免疫保护率为80%,表明温氏附红细胞体特异抗原组分亚单位疫苗具有较好的免疫原性,能诱导小鼠产生良好的免疫保护作用。 相似文献
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根据GenBank中报道的猪抑制素基因序列设计两对引物,克隆含有抑制素抗原决定簇基因片段α(1~32)的p1INH和p2INH,在这两个片段中都设有限制性内切酶XbaⅠ的酶切位点,通过XbaⅠ把plINH与p2INH串联起来。串联抑制素基因片段与pcDNA3.1载体通过EcoRⅠ、HindⅢ酶切位点连接后经过转化DH5a感受态细菌构建重组载体。以重组载体作为模板,以含有EcoRⅠ、HindⅢ酶切位点的引物进行PCR,产物经验证为含串联的抑制素基因。串联的抑制素基因产生的融合蛋白具有抑制素的免疫原性,且不会与体内其他蛋白发生免疫交叉反应。串联后的基因片段在单位体积内的抗原位点数增多,免疫效果也会加强。可以反馈性地抑制FSH的分泌,提高母畜的排卵数,提高产仔数。 相似文献
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鸭疫里氏杆菌油乳剂三价灭活疫苗的研究 总被引:2,自引:1,他引:1
为了更有效地控制鸭疫里氏杆菌病的流行,选择鸭疫里氏杆菌3个不同血清型流行菌株GXRA01、GXRA07和RAGX09制备油乳剂三价灭活疫苗。对疫苗进行免疫接种剂量试验、安全性检验、免疫效力检测以及保存期试验。结果表明,疫苗安全有效,每只雏鸭颈部皮下注射0.5 mL,能抵抗鸭疫里氏杆菌的攻击,免疫保护期为50 d,4℃~8℃疫苗保存期为6个月。研制的鸭疫里氏杆菌油乳剂三价灭活疫苗具有良好的安全性和免疫原性。 相似文献
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Five live virus vaccines against avian infectious laryngotracheitis were studied with regard to safety, immunogenicity and route of administration. Significant differences in virulence between the vaccine strains were found. Reduced virulence was accompanied by a reduction of immunogenicity and capacity to spread. After eyedrop application, a low virulent vaccine induced 90-100% flock immunity for the first 10 weeks after vaccination (PV), followed by a slow decline to 50% at 31 weeks PV, whereas flock immunity induced with the more virulent types remained at about 90% till the end of the experiments (24 and 48 weeks PV). Aerosol vaccination induced 70-100% flock immunity but vaccine reactions were severe. Application of vaccine in a coarse spray did not result in adverse vaccine reactions but induced a maximal protection rate of only 50%. Microneutralisation titres provided a useful indicator of immunity from the onset of immunity until immunity started to decline. A vaccine virus carrier state was demonstrated by means of sentinel birds. 相似文献
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An improved Corynebacterium pseudotuberculosis vaccine for sheep 总被引:1,自引:0,他引:1
Extensive experiments in mice confirmed that the immunogenicity of a Corynebacterium pseudotuberculosis vaccine could not be significantly improved with the use of various adjuvants. Immunity against C. pseudotuberculosis likewise could not be enhanced by incorporating various immunostimulants into the vaccine or by the use of live vaccines. However, a combination of aluminium hydroxide gel and saponin as adjuvant did have a beneficial effect. This vaccine was tolerated better, and a smaller dose apparently protected sheep more effectively against intralymph node challenge than the currently available alum-precipitated vaccine. 相似文献
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T Dravecky J Kazár I Zársky S Schramek J Urv?lgyi M Trávnicek J Balascák 《Veterinární medicína》1987,32(5):309-313
Reactogenicity was studied in a combined vaccine against Q-fever and chlamydia-induced abortion in ewes; the vaccine consisted of a mixture of purified corpuscles of Chlamydia psittaci (100 micrograms) and Coxiella burnetii (50 micrograms). The immunogenicity of the combined vaccine, evaluated by the number of positive serums after vaccination and by the average geometric titre of antibodies, was the same as that of the vaccine separate constituents as to the antibodies to C. burnetii, but somewhat higher in the case of antibodies to Chlamydia psittaci. When studied on a smaller number of ewes, the combined vaccine had an optimum immunogenicity in the cases of the prevalence of Chlamydia psittaci over C. burnetii in the vaccine. 相似文献