基于继发性免疫失败的麻疹模型及其动力学行为

建立一类基于接种疫苗引发的继发性免疫失败的麻疹传染病模型. 先利用下一代矩阵法得到该模型的基本再生数R₀, 并给出其生物学意义; 再通过构造合适的Lyapunov函数, 证明R₀是一个阈值参数: 当R₀≤1时, 无病平衡点是全局渐近稳定的; 当R₀>1时, 无病平衡点是不稳定的, 传染病平衡点是全局渐近稳定的.     

Reduction of the number of mice used for potency testing of human and animal rabies vaccines

Summary Eight different rabies vaccines were tested for their potency in the standard mouse potency test using 3-, 5- and 7-week-old mice. 5-week-old mice seem to be best suited for this purpose, variability from test to test could be reduced considerably. An ELISA was used in parallel for the evaluation of the rabies glycoprotein content of rabies vaccines. Results of the mouse potency test correlated well with those of the ELISA if highly purified human vaccines were tested. Unspecific reactions in the ELISA caused by adjuvanted veterinary vaccines could not be blocked. Further experiments will be needed in order to evaluate the potency of inactivated veterinary rabies vaccines by a in vitro test.     

HPV16E7-HSP70 Hybrid DNA Vaccine Induces E7-Specific Cytotoxic T Cells and Antitumor Immunity

0 IntroductionInbroicguhltat einxpge cDtaNtiAonvafcocri nper eivse ant ninegw aanpdp cruoraicnhg wdiits-heases . Due to the comparative weakness of cellulari mmunity that is purely induced by E7 DNA vac-cine,research on DNA vaccine is now focused onhowto enhance the i mmunogenicity of DNA vac-cine.It has been found in some research that thestrength of cellular i mmunity activity has things todo with the speed of antigen molecules’degrada-tion,i .e.the faster the degradation,the higher th…     

转乙肝表面抗原基因植物疫苗研究的进展

介绍了转基因疫苗生产的原理及方法，综述了转乙肝表面抗原基因植物疫苗的研究进展，探讨了转基因植物研究中所存在的问题及其转基因植物疫苗的优点及前景。     

人工免疫算法对遗传算法改进的仿真研究

遗传算法是一种很好的优化算法,但其本身存在着易早熟、效率低等不足.人工免疫算法是参考生物免疫系统机制的一种算法,它通常用于对其它算法的改进.论文用人工免疫算法对遗传算法进行改进,在遗传算法中引入浓度机制并从问题中提取疫苗.通过实验对比,它对遗传算法的改进取得了较好的效果.     

树突状细胞抗肿瘤疫苗的基础及临床研究现状

树突状细胞（Dendritic Cells,DCs）是目前发现的免疫系统中功能最强的专职递呈细胞。大量研究表明DCs疫苗在抗肿瘤免疫性中扮演着非常重要的角色。本文就DC的生物学特性及功能？在临床肿瘤治疗中的意义？国内外应用DC治疗常见肿瘤的现状进行综述。这将为有关DC的基础和临床试验提供有价值的信息。     

猪链球菌灭活苗的实验研究

猪链球菌病在一些地区经常发生。菌株主要有C、D、L、E、R等多群血清型。目前多采用C群疫苗对猪群进行防疫，但不能完全控制本病的发生．通过在发病猪场从经诊断为链球菌病的病猪体内分离出链球菌菌株，并自制链球菌灭活苗，再应用于发病猪场进行防疫，实验证明此方法免疫效果良好。     

猪大肠埃希氏菌多价灭活苗的免疫实验

选择通辽地区优势血清型大肠杆菌 ,以其致病性强、免疫原性好的O8;S2 1、S3 1;O60 ;P3 8、PL4 0 ;O13 8;SF12 、SD65;O14 1;TB4 　J70 菌株 ,制成多价大肠杆菌灭活苗 ,对妊娠基础母猪进行免疫接种 ,使仔猪通过初乳获得被动免疫 ,经 45 0 0头仔猪小群试验 ,免疫保护率为 98 5 % ,预防效果令人满意 ,可进一步扩大试验 ,以期用于生产 .     

Secretory expression of the fusion protein composed of human IL-2 and PreS antigen of hepatitis B virus in mammalian cells

In order to make entire HBV pmSAg secrete from mammalian cells, we conatmcted an eukaryotic expression vector by using leader sequence of human interleukin-2 (IL-2) as secretory signal peptide, and using high hydmphilic amino acids as the linker between IL-2 C end and preSAg N end. As a result, the IL-2preS fusing protein could be secreted from mamalian cells transfected with the reconstructed vector and the expression efficiency was identical to that of natural IL-2. It was considered that the retentive effect of preSlAg could be successfully bypassed. The results not only laid a theoretical and practical foundation for constructing specific gene vaccine against HBV persistent infection, but also supplied experimental evidence for studying modulation of protein secretory expression.     

鸡传染性法氏囊病地方流行毒株的分离与制苗种毒的筛选

从河北省昌黎县不同鸡场发生的法氏囊病鸡群中,分离到ＪＤ１,ＪＤ２,ＪＤ３,ＪＤ４,ＪＤ５共５株ＩＢＤ病毒毒株,通过初步分离与试验,并对其作了致病性、鸡胚适应性和免疫保护性等项试验。结果表明：所分离的５株均为ＩＢＤＶ,且可使易感鸡１００％发病,致死率在０～４０％。其中ＪＤ２和ＪＤ５可以在鸡胚中稳定增殖并使鸡胚规律性死亡。尽管通过鸡胚驯化,使分离的ＩＢ－ＤＶ毒力有所下降,但其灭活后免疫鸡,仍可使鸡对ＩＢＤ流行毒株的攻击达到８５％的保护率。ＪＤ２可作为ＩＢＤ囊组织抗原的种毒,也可作为ＩＢＤ鸡胚抗原的种毒。