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1.
为评价母源抗体对抗新城疫病毒(NDV)重组鸡痘病毒(rFPV)活疫苗免疫效力的影响,本研究用单表达、共表达NDV基因VII型病毒ZJ1株F、HN基因的rFPV活疫苗rFPV-12LSF、rFPV-12LSHN、rFPV-12LSFHN和油乳剂灭活疫苗分别免疫14日龄商品蛋鸡,rFPV疫苗的免疫剂量均为2×104pfu,免疫后21d分别用106ELD50NDV不同强毒株攻毒。其中F48E8株攻毒的免疫保护率分别为30.3%、73.2%、41.1%;而ZJ1株攻毒的免疫保护率分别为89.3%和35.8%、67.9%、78.6%、100%。用表达鸡IL-2基因的rFPV-12LSIL-2与rFPV-12LSHN联合免疫没有提高rFPV-12LSHN疫苗的免疫保护力。试验结果表明,单表达NDV HN基因的rFPV-12LSHN可作为NDV活疫苗候选株,为NDV重组鸡痘病毒活疫苗的进一步应用性开发奠定了基础。  相似文献   

2.
表达NDV HN基因的重组鸡痘病毒的部分生物学特性研究   总被引:1,自引:0,他引:1  
为了评价转基因对鸡痘病毒(FPV)生物学特性的影响,通过电镜观察表达新城疫病毒(NDV)血凝素-神经氨酸酶蛋白(HN)基因重组鸡痘病毒(rFPV-12LSHN)感染的鸡胚成纤维细胞(CEF).结果表明:在FPV中插入NDV HN基因后,不改变rFPV的形态、病毒成熟过程;rFPV-12LSHN与FPV在CEF上的产量无...  相似文献   

3.
鸡新城疫病毒HN基因亚单位疫苗诱导免疫保护的实验研究   总被引:3,自引:0,他引:3  
实验分别将应用Bac to Bac系统表达的新城疫病毒四平株和长春株血凝素-神经氨酸酶基因(HN基因)蛋白的重组杆状病毒感染Sf-9昆虫细胞后28℃培养72h后,洗涤、收集昆虫细胞,离心浓缩,-20℃冻融3次,用HA-HI实验和HN单抗中和试验测定表达产物的活性,将表达的重组蛋白作为亚单位疫苗免疫鸡,用间接ELISA和HI试验测定鸡体内抗体效价,免疫后第15d用国家标准强毒NDVF48E8攻毒,统计免疫保护率,结果表明,表达的NDVHN重组蛋白能够诱导鸡体产生抗NDV特异性IgG抗体和HI抗体,实验Ⅰ组(四平株)雏鸡保护率为65%,实验Ⅱ组(长春株)雏鸡保护率为100%。  相似文献   

4.
母源抗体的干扰是重组鸡痘病毒(FPV)活载体基因工程疫苗至今未能得到推广应用的主要原因,本试验使用FPV新的复制非必需区构建的载体pP12-18构建在高母源抗体商品鸡具有较高免疫力的基因工程疫苗.将H5亚型禽流感病毒分离株的血凝素(HA)基因和神经氨酸酶(NA)基因定向插入鸡痘病毒转移载体pP12-18中,H5A和NA基因的启动子分别为PS和PE/L,获得用不同的启动子启动不同的外源基因且两基因盒方向为背向串联的重组转移载体p12LSH5HANA.将p12LSH5HANA转染至已感染鸡痘病毒282E4疫苗株(wt-FPV)的鸡胚成纤维细胞(CEF)中.p12LSH5HANA与wt-FPV基因组DNA之间的同源重组产生了重组鸡痘病毒rFPV-12LSH5HANA.通过在含X-Gal的营养琼脂上连续挑选蓝色病毒蚀斑,获得纯化的重组病毒.经传代证实该重组病毒具有良好的遗传稳定性.用105PFU的rFPV-12LSH5HANA免疫无特定病原体(SPF)鸡,能激发机体产生有效的血凝抑制(HI)抗体.初步的动物试验表明,该重组病毒能使经滴鼻点眼攻毒的SPF鸡抵抗H5亚型AIV的致死性攻击,保护率为100%.在高母源抗体的商品鸡上,rFPV-12LSH5HANA与原有载体构建的重组疫苗rF-PV-11SH5HANA的免疫效力有显著差异,保护率分别为81.4%和45.4%.结果表明,选择FPV合适的复制非必需区构建载体是提高重组FPV在高母源抗体商品鸡免疫效力的有效策略之一.  相似文献   

5.
传染性喉气管炎新城疫鸡痘重组病毒免疫效力的研究   总被引:1,自引:2,他引:1  
在表达鸡传染性喉气管炎病毒(ILTV)糖蛋白gB基因和新城疫病毒(NDV)F基因的重组鸡痘病毒(rF-PV-gB-F)安全性检验合格后,以5.0×101~5.0×104PFU不同含量按0.1mL/鸡的剂量免疫100只30日龄SPF鸡,30d后分组分别用ILTVWG株和NDVF48E9株强毒进行攻击。免疫鸡抗鸡痘病毒抗体都转为阳性,痘反应和接种剂量有关,重组疫苗的最小反应剂量为50PFU。重组疫苗可以诱发对新城疫和传染性喉气管炎的保护,0.1mL/鸡的接种量在500~5000PFU浓度范围内的免疫效果最好,对于ILTV攻击的发病保护率在70%以上,对NDV强毒攻击的抗死亡保护率可以达到80%,这为进一步考察疫苗的免疫效力试验以及进行田间试验奠定了基础。  相似文献   

6.
为检测Asia 1口蹄疫(Foot and mouth disease,FMD)重组病毒免疫原性和安全性,将构建表达Asia 1型口蹄疫病毒(Foot and mouth disease virus,FMDV)3C基因、P1-2A基因和猪白细胞介素18(Interleukin 18,IL-18)基因的重组鸡痘病毒rFPV-P1-2A-3C和rFPV-3C-P1-2A-IL-18间隔2周免疫豚鼠3次,进行特异性抗体、中和抗体、淋巴细胞增殖、淋巴细胞亚类数量、IFN-γ、攻毒保护以及体内分布研究。重组鸡痘病毒可有效刺激豚鼠产生特异性抗体、中和抗体、T淋巴细胞亚类数量、IFN-γ分泌均显著高于对照组;重组鸡痘病毒rFPV-3C-P1-2A-IL-18的T淋巴细胞亚类数量、T淋巴细胞转化和IFN-γ分泌高于重组病毒rFPV-P1-2A-3C免疫组;2个重组病毒的攻毒保护率分别为4/5、3/5。2个重组病毒在接种最早12h可检测到重组病毒的基因,最晚7d可检测到重组病毒的基因。结果表明重组鸡痘病毒rFPV-P1-2A-3C和rFPV-3C-P1-2A-IL-18具有良好的免疫原性,可以有效抵御病毒的攻击,体内残留时间短,对免疫动物安全,为开发、应用新型FMDV疫苗奠定了基础。  相似文献   

7.
将共表达鸡传染性支气管炎病毒(mv)S1基因和鸡干扰素-γ基因的重组鸡痘病毒(rFPV—IFN-γ S1)接种4周龄SPF鸡,免疫3周后用同源(LX4株)及异源强毒株(LTJ95I)攻毒,评价重组疫苗对异源病毒的保护作用。结果显示,重组疫苗接种1周后,免疫鸡产生抗IBV的抗体;而且外周血中CD4^+和CD8^+T淋巴细胞的含量略高于非免疫对照组;攻毒后,异源强毒株攻毒的免疫组CD4^+T淋巴细胞呈下降趋势,并且该组低水平CD4^+的状态一直持续到试验结束,而其他组CD4^+T淋巴细胞均迅速上升,峰值达到14.5%;同源强毒株攻毒的免疫组CD8^+T淋巴细胞呈高水平的表达,而其他组攻毒后均无明显变化;保护率结果显示,同源强毒株攻毒免疫组的发病率和死亡率为21.43%和0%,与其他各组相比均有显著差异;另外同源强毒株攻毒的免疫组病理损伤与异源强毒株攻毒的试验组相比明显减轻,其排毒时间和排毒量也均有所减少;强毒攻毒后所有试验组体重无显著差异。以上结果可以说明,重组疫苗能对同源强毒株产生较好的免疫保护,但不能对遗传关系较远的强毒株产生有效的免疫应答。  相似文献   

8.
将马立克氏病病毒(MDV)gB基因插入鸡痘病毒中,构建了含有MDV-gB基因的重组鸡痘病毒(rFPV),用rFPV、火鸡疱疹病毒(HVT)冻干疫苗、rFPV HVT二联疫苗分别免疫1日龄AA肉用雏鸡,8日龄攻毒后观察免疫保护效果。结果表明,3种疫苗均诱导了免疫应答,免疫保护率分别为69%、69%和85%。该重组病毒疫苗的免疫效果与HVT疫苗的免疫效果相当,二者联用具有免疫协同作用。  相似文献   

9.
将10日龄的SPF鸡和15、28日龄的商品鸡分别随机分组,同时免疫不同剂量的rFPV-HN(表达NDV HN基因重组鸡痘病毒)和表达不同细胞因子(IL-1β、IL-2、IFN-γ、MGF)的重组鸡痘病毒(rFPVs)。在免疫后不同时间,通过检测血液中抗NDV的HN蛋白抗体、脾脏中CD4+和CD8+T细胞的变化及攻毒保护率等指标。结果表明:IL-1β或IFN-γ在免疫后期能促进抗HN间接ELISA抗体的滴度上升,而且产生抗体的整齐度好;IL-1β或IL-2可以显著增加脾脏中CD4+和CD8+T细胞含量;IL-1β、IL-2或IFN-γ同样可以提高商品鸡攻毒后的存活率。IL-2和IFN-γ在增加脾脏中CD4+和CD8+T细胞的数量及攻毒保护方面表现出一定的协同增强作用。  相似文献   

10.
将共表达鸡传染性支气管炎病毒(IBV)SI基因和鸡干扰素.丫基因的重组鸡痘病毒(rFPV-IFNγ S1)接种4周龄SPF鸡,免疫3周后用同源(LX4株)及异源强毒株(LTJ951)攻毒,评价重组疫苗对异源病毒的保护作用.结果显示,重组疫苗接种1周后,免疫鸡产生抗IBV的抗体;而且外周血中CD4+和CD8+T淋巴细胞的含量略高于非免疫对照组;攻毒后,异源强毒株攻毒的免疫组CD4+T淋巴细胞呈下降趋势,并且该组低水平CD4+的状态一直持续到试验结束,而其他组CD4+T淋巴细胞均迅速上升,峰值达到14.5%;同源强毒株攻毒的免疫组CD8+T淋巴细胞呈高水平的表达,而其他组攻毒后均无明显变化;保护率结果显示,同源强毒株攻毒免疫组的发病率和死亡率为21.43%和0%,与其他各组相比均有显著差异;另外同源强毒株攻毒的免疫组病理损伤与异源强毒株攻毒的试验组相比明显减轻,其排毒时间和排毒量也均有所减少;强毒攻毒后所有试验组体重无显著差异.以上结果可以说明,重组疫苗能对同源强毒株产生较好的免疫保护,但不能对遗传关系较远的强毒株产生有效的免疫应答.  相似文献   

11.
将H5亚型禽流感病毒血凝素HA基因克隆入插入载体pllS中获得重组转移质粒p11SH5A,通过酶切鉴定获得了预期的转移质粒p11SHSA,将质粒p11SHSA和野生禽痘病毒(wtFPV)共转染鸡胚成纤维细胞(CEF),通过蓝白斑筛选纯化得到重组病毒rFPV-11SH5A.以间接免疫荧光法证实,HA基因得到了表达.将该重组病毒rFPV-11SH5A以10(5)PFU/只免疫7日龄SPF鸡,于7、10、14、18、21d分别采血分离血清检测HI抗体,于免疫21d后用10(5)ELD50的野生病毒进行肌肉注射观察疫苗保护率.结果表明,该疫苗能提供100%的保护.  相似文献   

12.
在正常饲养条件下,在肉种鸡鸡群中试用网状内皮增生病病毒(reticuloendotheliosis virus,REV)的弱毒疫苗,观察其对体重增长、产蛋生产性能、对其他疫苗应答有无影响。同时连续定期测定种鸡血清REV抗体,并测试抗体阳性鸡的后代有无病毒垂直传播。结果表明,该疫苗接种18周龄种鸡后,对生长、产蛋率、受精率和孵化率等生产性能均无不良影响,对正常疫苗免疫的抗体应答也无影响。经免疫接种REV弱毒疫苗的种鸡,在开产后及产蛋高峰期,均不表现病毒的垂直传播。免疫种鸡后,其激发的抗体可持续280d以上,且雏鸡血清中母源抗体可持续至少7d。结果表明,该REV弱毒在开产前种鸡应用时有很高的安全性,并能为雏鸡提供足够的特异性母源抗体。  相似文献   

13.
新城疫病毒通用型实时RT-PCR检测方法的建立与应用   总被引:3,自引:0,他引:3  
采用TaqMan方法,经引物和探针的设计、筛选及反应条件优化,研究了检测活禽和禽产品中新城疫病毒的通用型实时RT-PCR(RRT-PCR)方法。结果显示,对12株分别为速发型、中发型、缓发型和疫苗株新城疫病毒的尿囊液倍比稀释液的检测极限在10-5~10-7之间;建立的方法与常见禽类病毒无交叉反应,特异性良好;在检测人工感染肉鸡的脏器组织、咽喉、泄殖腔拭子中病毒的灵敏度同鸡胚分离试验基本一致;弱毒疫苗免疫鸡群在免疫后14 d,应用本方法不能从咽喉、泄殖腔拭子中检测到病毒;临床样品检测表明,该方法不仅可以检出中强毒力新城疫毒株,也可检出缓发型野毒株和疫苗毒株。  相似文献   

14.
Two types of live attenuated vaccines have been used worldwide for the control of infectious laryngotracheitis virus (ILTV): 1) chicken embryo origin (CEO) vaccines; and 2) tissue culture origin vaccines (TCO). However, the disease persists in spite of extensive use of vaccination, particularly in areas of intense broiler production. Among the factors that may influence the efficiency of ILTV live attenuated vaccines is a possible interference of Newcastle Disease virus (NDV) and infectious bronchitis virus (IBV) vaccines with the protection induced by ILTV vaccines. The protection induced by CEO and TCO vaccines was evaluated when administered at 14 days of age alone or in combination with the B1 type strain of NDV (B1) and/or the Arkansas (ARK) and Massachusetts (MASS) serotypes of IBV vaccines. Two weeks after vaccination (28 days of age), the chickens were challenged with a virulent ILTV field strain (63140 isolate, group V genotype). Protection was evaluated at 5 and 7 days postchallenge by scoring clinical signs and quantifying the challenge virus load in the trachea using real-time PCR (qPCR). In addition, the viral load of the vaccine viruses (ILTV, NDV, and IBV) was quantified 3 and 5 days postvaccination also using qPCR. The results of this study indicate that the NDV (B1) and IBV (ARK) vaccines and a multivalent vaccine constituted by NDV (B1) and IBV (ARK and MASS) did not interfere with the protection induced by the CEO ILTV vaccine. However, the NDV (BI) and the multivalent (B1/MASS/ARK) vaccines interfered with the protection induced by the TCO vaccine (P < 0.05). Either in combination or by themselves, the NDV and IBV vaccines decreased the tracheal replication of the TCO vaccine and the protection induced by this vaccine, since the ILTV-vaccinated and -challenged chickens displayed significantly more severe clinical signs and ILTV load (P < 0.05) than chickens vaccinated with the TCO vaccine alone. Although NDV and IBV challenges were not performed, the antibody responses elicited by NDV and/or the IBV vaccinations were significantly reduced (P < 0.05) when applied in combination with the CEO vaccine.  相似文献   

15.
16.
Despite the intensive vaccination policy that has been put in place to control Newcastle disease virus (NDV), the recent emergence of NDV genotype VII strains in Korea has led to significant economic losses in the poultry industry. We assessed the ability of inactivated, oil-emulsion vaccines derived from La Sota or Ulster 2C NDV strains to protect chickens from challenge with Kr-005/00, which is a recently isolated Korean epizootic genotype VII strain. Six-week-old SPF chickens were vaccinated once and challenged three weeks later via the eye drop/intranasal route. All vaccinated birds were fully protected from disease, regardless of the vaccine strains used. All vaccinated and challenged groups showed significant sero-conversion 14 days after challenge. However, some vaccinated birds, despite being protected from disease, shed the challenge virus from their oro-pharynx and cloaca, albeit at significantly lower titers than the unvaccinated challenged control birds. The virological, serological, and epidemiological significance of our observations with regard to NDV disease eradication is discussed.  相似文献   

17.
The avian adeno-associated virus (AAAV) is a replication-defective nonpathogenic virus member of the family Parvoviridae that has been proved to be useful as a viral vector for gene delivery. The use of AAAV for transgenic expression of Newcastle disease virus (NDV) hemagglutinin-neuraminidase (HN) protein and its ability to induce immunity in chickens were assessed. Proposed advantages of this system include no interference with maternal antibodies, diminished immune response against the vector, and the ability to accommodate large fragments of genetic information. In this work the generation of recombinant AAAV virions expressing the HN protein (rAAAV-HN) was demonstrated by electron microscopy, immunocytochemistry, and western blot analysis. Serological evidence of HN protein expression after in ovo or intramuscular inoculation of the recombinant virus in specific-pathogen-free chickens was obtained. Serum from rAAAV-HN-vaccinated birds showed a systemic immune response evidenced by NDV-specific enzyme-linked immunosorbent assay and hemagglutination inhibition testing. Positive virus neutralization in embryonated chicken eggs and indirect immunofluorescence detection of NDV infected cells by serum from rAAAV-HN vaccinated birds is also reported. A vaccine-challenge experiment in commercial broiler chickens using a Venezuelan virulent viscerotropic strain of NDV was performed. All unvaccinated controls died within 5 days postchallenge. Protection up to 80% was observed in birds vaccinated in ovo and revaccinated at 7 days of age with the rAAAV-HN. The results demonstrate the feasibility of developing and using an AAAV-based gene delivery system for poultry vaccination.  相似文献   

18.
本研究以新城疫病毒(NDV)V蛋白羧基端结构域(Vc)的重组蛋白为包被抗原,建立了用于检测NDV V蛋白抗体的间接ELISA方法,并采用该方法检测了鸡群免疫或接毒后血清中的V蛋白抗体水平。结果显示:两组不同NDV灭活疫苗组在免疫后的3周内检测结果均为阴性;两组灭活疫苗免疫3周后再人工感染NDV强毒的鸡群,攻毒后第7、14和21 d,NDV阳性率分别为60%、80%、70%和50%、80%、70%;两组不同的NDV弱毒疫苗免疫组鸡群,仅在免疫后第21 d阳性率分别为20%和10%。以上结果表明,NDV疫苗免疫组与强毒感染组的V蛋白抗体阳性率存在明显差异,本方法可在群体水平上区分新城疫疫苗免疫与强毒感染鸡群,为NDV血清学诊断和流行病学调查提供了一种新的检测手段。  相似文献   

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