口蹄疫嵌合病毒疫苗的研究

口蹄疫病毒（ＦＭＤＶ）ＶＰ１（１３２－１５９位残基）的Ｇ－Ｈ环是病毒粒子表面的主要特征，它在疫苗效力，抗原变异和细胞结合中起着主要作用。我们用ＦＭＤＶ的感染性ｃＤＮＡ构建一种Ａ血清型病毒，在该病毒中，其Ｇ－Ｈ环被Ｏ或Ｃ血清型病毒的同源序列取代。这种嵌合病毒的复制滴度高，并表现与野毒相似的噬斑形态。由此证明，Ｇ－Ｈ环可在血清型之间交换。单克隆抗体分析表明，环内所含抗原表位可被转移至嵌合体，并保持由Ａ     

口蹄疫病毒灭活的研究

将兔体传代的Ｏ型口蹄疫病毒（ＦＭＤＶ）适应ＢＨＫ２１细胞培养，该细胞毒的ＴＣＩＤ５０达７－７．６。在ＰＨ７．９的介质中，用胺类衍生物能使ＦＭＤＶ彻底灭活。给豚鼠接种灭活毒后１个月攻击强毒，能极有效地保护豚鼠抵抗强毒攻击，实验动物的保护达１００％。     

斑点ELISA检测口蹄疫病毒的研究

斑点ＥＬＩＳＡ检测口蹄疫病毒的研究杨永钦，黄德生，李乐（云南省畜牧兽医研究所，昆明６５０２２４）材料与方法一、病毒系本所保存的口蹄疫种毒Ｏ型和ＡｓｉａⅠ型；二、豚鼠高免血清ＰＢＳ将种毒制成１０￣（－１）悬液，部穿刺接种０．５ｍｌ，重复免疫３次，无菌抽...     

猪口蹄疫防控特辑：猪口蹄疫的流行特点

猪口蹄疫有着悠久的历史,一直被视为对养猪业最重要的疾病之一,是可造成重大经济损失的一种人畜共患病。对猪口蹄疫的流行特点．防控策略进行了综述。     

猪口蹄疫流行现状

口蹄疫(Foot-and-mouth disease,FMD)是由口蹄疫病毒所引起的一种急性、热性、高度接触性的动物传染病。感染对象是猪、牛、羊等主要畜种及其他家养和野生偶蹄类动物,易感动物多     

认识口蹄疫

英国发生口蹄疫，欧洲震惊，欧盟及其成员国紧急行动，构筑防火墙；全球惊恐，联合国发出警告：全球严防口蹄疫；世界各国都积极采取严格措施严防死守，惟恐避之不及。约９０个国家和地区对来自欧盟国家的牲畜和产品颁布了禁令 口蹄疫是什么？口蹄疫是如何传括的？它的危害到底有多大？其原因及其控制措施？这是谈牛色变，闻蹄心惊时应调研、认识的。１ 什么是口蹄疫 口蹄疫（ｆｏｏｔ－ａｎｄ－ｍｏｕｔｈ　ｄｉｓｅａｓｅ，ＦＭＤ）是由口蹄疫病毒引起偶蹄兽的一种急性热性、高度接触感染的传染病。患病动物的口、舌、唇、鼻、蹄、乳房等…     

口蹄疫流行现状的分析及防控措施

口蹄疫是由口蹄疫病毒引起偶蹄兽的一种急性、热性、高度接触性传染病.本病传染性强,是全球范围内最具感染性的动物疾病之一,其危害性极大,为世界法定传染病.世界各国由于此病的爆发流行已遭受巨大的经济损失,在生产实践中如不能很好的加以控制,不仅严重危害人身健康,同时将带来不可估量的经济损失.本文通过对口蹄疫的发展史、病原、流行病学、发生原因等流行因素进行分析,提出了有效的防控措施,以切实可行地控制和消灭口蹄疫.     

口蹄疫抗体免疫金标快速检测试纸法的建立

应用免疫学原理与胶体金层析技术，采用双抗原夹心ELISA建立了检测口蹄疫(O型)抗体水平的“口蹄疫抗体(O型)免疫胶体金快速检测试纸法”。应用该法与“口蹄疫正向间接血凝抗原法”对300份猪、鸡、鸭、牛、羊等血液或血清进行口蹄疫抗体水平检测试验，符合率达100％。试验结果显示，该法与间接血凝法一样，具有微量、特异、准确等优点，且操作简易，不需要任何仪器，检测时间短，结果直观，容易判定，适用于基层兽医站、养猪场使用和大面积口蹄疫抗体普查。     

口蹄疫疫苗研究新进展

口蹄疫是由口蹄疫病毒引起的一种急性、热性、高度接触传染性和可快速远距离传播的动物疾病。大多数流行口蹄疫的国家采取以计划免疫为主的措施预防和控制口蹄疫。文章综述了口蹄疫疫苗的研究概况,以期对口蹄疫的防控提供指导。     

贵阳地区家畜口蹄疫免疫抗体监测结果分析

采用LB—ELISA方法对贵阳地区6个种畜场、8个规模养殖场、11户农村散养户和5个屠宰场迭检的826份血清样本进行口蹄疫免疫抗体检测，结果表明：贵阳市家畜口蹄疫免疫抗体的平均合格率为84．6％，达到农业部要求。其中种畜场口蹄疫免疫抗体的平均合格率为97．1％，规模养殖场为92．19，5，农村散养户为72．79，5，屠宰场为63．79，5，免疫抗体合格率的总体趋势为种畜场〉规模场〉散养户〉屠宰场。     

比较3种间接ELISA试验检测口蹄疫感染抗体的研究

将3种检测口蹄疫非结构蛋白抗体的间接ELISA试验进行了比较。这3种间接ELISA试验检测田间血清样品的最低符合率为96％，最高符合率达98％：有2种间接ELISA试验可以检测到感染口蹄疫第10天后血清中的口蹄疫感染抗体．有1种间接ELISA试验可以检测到感染口蹄疫第14天后血清中的口蹄疫感染抗体；这3种间接ELISA试验检测12份已知口蹄疫阳性血清的试验结果吻合。研究表明．这3种间接ELISA试验方法对于检测口蹄疫感染抗体具有较好的特异性．其中猪口蹄疫3A蛋白间接ELISA诊断试剂盒在灵敏性、特异性和符合率方面更优于另外2种试剂盒。     

检测奶牛隐性感染FMDV RT-PCR方法的建立及应用

根据已发表的口蹄疫病毒(FMDV)基因序列设计了一对引物,扩增FMDV 3D后1/3区段,应用反转录聚合酶链式反应(RT-PCR)技术,从组织培养液中扩增出大小为489 bp的基因片段,建立了FMDV RT-PCR检测方法.该方法灵敏度高,可检测出0.01个TCID50的病毒含量;特异性好,不与其他病毒如PRV、PRRSV、JEV等发生交叉反应.阳性样品的检测结果与反向间接血凝(IHA)检测结果的符合率为100%.应用所建立的RT-PCR方法,对采自3个奶牛场的55份鲜奶样品及40份牛鼻拭子样品进行检测.结果表明,所建立的检测方法可用于奶牛隐性感染FMDV的检测.     

RT-PCR快速检测口蹄疫病毒

根据口蹄疫病毒VP1基因的序列，设计了1对引物，建立了检测口蹄疫病毒的RT－PCR方法。对FMDV各毒株检测，结果均为阳性，而对猪病毒性疾病相关病毒进行检测，结果均为阴性；检测19份已知阳性样品，检出率100％；与动物接种试验比较，符合率100％，证明该方法特异，与经典方法动物接种试验比较，其灵敏度提高100倍左右；对O3I3株的细胞毒进行检测，其敏感度达10个TCID50。初步结果表明所建立的RT－PCR技术可用于口蹄疫的诊断和流行病学调查。     

A Comparison of Methods for Measuring the Antibody Response in Mice and Cattle following Vaccination against Food and Mouth Disease

We present a comparison of methods for evaluating the potency of foot and mouth disease vaccine in the laboratory. The anti-FMDV antibodies (Ab) in vaccinated mice were tested by liquid phase (lp) ELISA, solid phase (sp) ELISA and virus neutralization (VN), and were compared with the Ab titres detected by lpELISA, which is the official test in Argentina for testing the potency of FMD vaccines and protection against a virulent challenge in cattle. The results demonstrated that it is possible to relate the Ab levels induced in vaccinated mice with both the Ab and protective responses elicited in cattle. Furthermore, it was found that the anti-FMDV Ab titres in mice detected by lpELISA 14 days after vaccination should be an accurate parameter for predicting the results of the challenge test in cattle. Thus, this test in mice appears to be an inexpensive and rapid alternative for testing FMD vaccines in cattle.     

口蹄疫病毒前导蛋白结构及功能研究进展

口蹄疫病毒前导蛋白为一种木瓜蛋白半胱氨酸酶,用一个半胱氨酸区作为亲和试剂.由于结构上的特殊性,使其能够进行自身切割,从正合成的多聚蛋白中游离自己,并通过切割宿主蛋白eIF的两种相似因子4GⅠ和4GⅡ减弱宿主细胞转录自身mRNA的能力,尤其使α/β干扰素的翻译受到抑制,从而为病毒的复制及感染创造有利条件.文章从结构特点、功能特性方面对其进行阐述.     

Recombinant pseudorabies virus expressing P12A and 3C of FMDV can partially protect piglets against FMDV challenge

One of the crucial factors for evaluation of an effective genetically engineered vaccine is whether susceptible animals are protected from virus challenge after vaccination. In this study, a recombinant pseudorabies virus (PRV-P12A3C) that expressed capsid precursor polypeptide P12A and nonstructural protein 3C of foot-and-mouth disease virus (FMDV) was used as a vaccine. The expression of P12A3C and its immunogenicity and protective efficacy against FMDV challenge were measured. Humoral and cellular immune responses were evaluated after each immunization. Subsequently, each piglet was challenged with 1000 ID₅₀ (50% infection dose) FMDV serotype O, named OR/80, which is used to produce vaccine in China. PRV-P12A3C induced a high level of neutralizing antibody and FMDV-specific lymphocytes. Inactivated vaccine provided 100% protection, and the vector strain (TK⁻/gE⁻/gI⁻) showed no protection. PRV-P12A3C induced 60% protection, compared with piglets that were vaccinated with TK⁻/gE⁻/gI⁻. The severity of clinical signs for the remaining two piglets was lighter and the appearance of vesicles was delayed.     

Detection of Foot and Mouth Disease and Porcine Reproductive and Respiratory Syndrome Viral Genes Using Microarray Chip

Two viral pathogens, namely, porcine reproductive and respiratory syndrome virus (PRRSV) and foot and mouth disease virus (FMDV), were selected as models for multiple pathogen detection in a cDNA microarray. Two signature regions selected from ORF2 (around 500 bp) and ORF5 (around 600 bp) of PRRVS (America serotype), and one signature region from structural genes VP1 (around 500 bp) of FMDV type O were designed and spotted on a nylon membrane. For PCR sensitivity study, the cloned FMDV–VP1 template could be diluted to near one copy and its PCR product was still detectable in gel electrophoresis. In the microarray detection, the labelling FMDV probes (3 mg/ml) could be diluted 320 times and still maintained a visible colour when hybridized with the chip. Using the mixing primers, the microarray chip demonstrated rapid and accurate detection of the specific genes. To our knowledge, this preliminary study is the first example reported applying the long signature sequences to the multiple pathogen detection in cDNA microarray.