共查询到19条相似文献，搜索用时 468 毫秒
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彭春香 《中国动物传染病学报》2012,20(3):27-30
为明确FP1株番鸭源禽Ⅰ型副粘病毒强毒与鸡新城疫强毒标准株F48E9之间的抗原性差异,本研究通过交互血凝抑制试验、血清交叉中和试验及雏番鸭免疫攻毒保护试验比较了FP1株番鸭源禽I型副粘病毒强毒与鸡新城疫强毒标准株F48E9之间的抗原性.结果显示同源阳性血清对病毒的血凝抑制效价比异源阳性血清对病毒的血凝抑制效价高2.66～4个滴度;两者之间的抗原相关值R为0.35;对于5日龄经肌注途径免疫接种1羽份量La Sota弱毒疫苗14d后的雏番鸭,以FP1株番鸭源禽Ⅰ型副粘病毒强毒、鸡新城疫强毒标准株F48E9分别攻击后,其保护指数分别为54.5、92.9.以上结果表明,FP1株番鸭源禽Ⅰ型副粘病毒与鸡新城疫强毒标准株F48E9存在较明显的抗原性差异,为鸭副粘病毒病疫苗的研制和该病的防控提供了依据. 相似文献
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近年来典型ND分离株的致病性和抗原性变异研究 总被引：1，自引：1，他引：0
8株ND分离株经过毒力测定(MDT小于47h；ICPI大于1．65)均属于NDV强毒，交互凝集抑制试验表明：分离株与C30和48株在HI效价上差1～3个滴度；攻毒试验表明不同毒株致病性明显不同；鸡胚中和试验则表明，La Sota单因子血清对分离株有中和作用，但中和滴度有明显差异。 相似文献
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新城疫作为家禽养殖业危害最大的疫病之一,近些年来常发生免疫失败的现象,究其原因,由于免疫压力的增大和变异株的增多,使疫苗的免疫效果受到极大的挑战,因此选择合适的病毒株制备疫苗对免疫效果具有重要的意义。论文通过测定抗体水平比较新城疫基因Ⅶ型A-Ⅶ株和传统基因Ⅱ型La Sota株油乳剂灭活疫苗对鸡只免疫效价的影响,通过攻毒后的保护、排毒情况及病毒载量的研究,综合比较了2种毒株的免疫原性。通过本试验发现,利用基因Ⅶ型A-Ⅶ株灭活苗与基因Ⅱ型La Sota株灭活苗免疫SPF鸡后,A-Ⅶ株灭活苗所产生的HI抗体效价明显高于La Sota株灭活苗。而通过基因Ⅶ型YND株和标准强毒F48E9株攻毒试验结果显示,2种疫苗均能100%的保护鸡只不死亡,但A-Ⅶ株比La Sota株灭活苗能够更好地抑制强毒在体内的复制和排毒。由此可见,基因Ⅶ型A-Ⅶ株对不同基因型强毒的抵抗能力优于基因Ⅱ型La Sota株,具有更好的免疫原性,通过本试验可为新城疫的防控选择合适的疫苗提供一定的参考。 相似文献
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10株新城疫病毒分离F基因的克隆及遗传变异分析 总被引：18，自引：0，他引：18
对10株具有一定代表性的NDV分离株的F基因进行RT-PCR扩增和序列测定,核苷酸序列及其推导的氨基酸序列比较结果表明:F基因核苷酸序列的同源性为93.6%,推导氨基酸序列同源性为95.39%;根据F基因裂解位点的氨基酸序列推测,其中2株属于弱毒株,8株属于强毒株,该结果与致病性试验测定的结果完全相符;不同年代、不同宿主分离株的F基因序列一致,高度保守.通过BLAST SEARCH比较,8株强毒株与广东鹅分离株GDGO(Y97)高度同源,处于进化树的同一分支.2株弱毒分离株与La Sota疫苗株仅有1～4个氨基酸改变,推测可能是免疫或散播La Sota疫苗株.抗原性指数分析表明HI分离株有三处明显变异,抗原位点推测分析表明H分离株比F48株和La Sota多出6个抗原位点,而Liu株抗原位点在446位后缺失. 相似文献
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为了明确不同血清新城疫病毒(NDV)抗体水平对鸡的保护效果,本研究采用重组NDV灭活疫苗(A-Ⅶ株)对鸡进行免疫,通过交叉血凝抑制(HI)试验比较A-Ⅶ株与La Sota株间的血清学差异,并采用NDV标准强毒株F48E8和基因Ⅶ型强毒株JSC0804对不同抗体水平免疫鸡进行了攻毒保护试验。结果显示：抗A-Ⅶ株血清用A-Ⅶ株抗原测得的平均HI抗体效价显著高于La Sota株抗原(P<0.01),约高1.5log2,而抗La Sota株血清用La Sota株抗原测得的平均HI抗体效价稍高于A-Ⅶ株抗原,但无显著差异(P>0.05),表明2种疫苗株存在一定的血清学差异。在试验条件下,所有免疫鸡经点眼滴鼻攻毒后均未表现明显临床症状,但存在不同程度的排毒现象,排毒率总体上随抗体效价升高呈逐渐下降趋势。A-Ⅶ株疫苗免疫鸡血清HI抗体效价分别达≥13log2和≥14log2时可完全阻止F48E8株和JSC0804株排毒。免疫鸡排毒一般仅限于攻毒后5 d内。本... 相似文献
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鸡新城疫CHR 株冻干疫苗中试产品3 批以及La Sota 株冻干疫苗( 符合质量要求) , 以5 种免疫途径: 肌注、滴鼻、喷雾、饮水、拌料分别接种11 日龄雏鸡。每批疫苗每种途径接种1 组, 20 只/ 组, 共20 组。雏鸡群免疫前血凝抑制抗体(HI) 效价为1∶2-13 , 于14 d 、28 d 后再测HI抗体水平, 并分别用10 000 鸡胚半数致死量(ELD50) 新城疫标准强毒北京株攻击。从而检测2 种疫苗用5 种免疫途径免疫后在不同时间的近期免疫效力。结果表明, 近期内CHR 株疫苗HI抗体呈上升趋势, 而La Sota 株疫苗HI抗体先升高后下降; CHR 株疫苗以饮水和拌料途径效果较好, 其它3 种途径效果相似。接种后14 d 攻毒, 2 种疫苗均能较好保护强毒攻击; 28 d 后, CHR 株保护率高于La Sota 株。 相似文献
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用新城疫病毒La Sota株作为复合物疫苗抗原,与新城疫特异性中和抗体混匀配制成4种不同比例的复合物疫苗,用1日龄普通雏鸡进行免疫效果对比试验。试验1~4组分别为免疫复合物疫苗1~4,试验5组免疫常规新城疫活苗,试验6组为空白对照组。免疫后3周采血测定HI抗体效价,同时用新城疫强毒北京株F48E9攻击。试验结果显示,试验1~6组HI抗体效价分别为3.2log2、3.1log2、3.3log2、3.2log2、3.1log2、2.9log2;攻毒后,试验1~6组鸡的死亡率分别为15%、20%、0%、35%、30%、50%。因此,新城疫病毒La Sota株与新城疫特异性抗体制备成复合物疫苗,能保持疫苗中抗原的免疫原性,并可减轻疫苗的毒副作用,提高疫苗的安全性,其免疫效果比常规活苗好。 相似文献
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新城疫是严重危害世界养禽业的一种禽类传染病。近年来,鸽新城疫的流行越来越严重,引起了养殖户和兽医工作者的广泛关注。本研究在4批发病鸽组织病料中分离到了4株鸽源新城疫强毒株和2株鸽源弱毒株。病毒分离株经鸡胚有限稀释法纯化5次后,新鲜尿囊液用于提取病毒RNA。经RT-PCR扩增、测序得到分离株的F基因和HN基因序列。通过对F基因的遗传进化分析发现,4株鸽源强毒株属于ClassⅡ基因Ⅵb亚型,2株鸽源弱毒株与Class II基因II型疫苗株La Sota高度同源。进一步遗传进化分析结果显示,4株鸽源新城疫病毒强毒株与目前国内流行株属于同一遗传分支,这些毒株与欧洲流行株亲缘关系十分相近,而与中国20世纪90年代鸽源分离株遗传距离稍远,因此推测当前鸽源流行强毒株可能源自欧洲。生物信息学分析显示鸽源毒株HN蛋白345~353位的一个线性抗原表位发生了改变,而血清学实验显示La Sota疫苗株和鸽源毒株的交叉血凝抑制存在明显差异,暗示鸽源毒株已经发生了抗原性变异。因此,使用鸡疫苗株La Sota免疫鸽存在免疫失败的风险,需要研发鸽专用新城疫病毒疫苗用于鸽新城疫的防疫工作。 相似文献
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鸡新城疫的流行与免疫 总被引：1，自引：0，他引：1
门诊病例统计表明，我国鸡群中ND的发病率仍非常普遍。近些年来，世界各地对NDV分离株的研究结果发现，其HN基因和F基因序列的某些位点发生的变化，致使毒株间的毒力差异较大，抗原性亦有差异，但其主要抗原表位未发生变化。山东家禽研究所禽病室对1998－1999年的6个NDV分离株做了比较研究，各毒株的毒力不同且都比经典的F48E9强，其中二个属基因Ⅶ型。但交叉免疫保护试验表明，用La Sota株弱毒苗及其灭活油乳苗免疫的鸡，在用这6个分离毒分别攻毒后，均有1005保护率。同样，用这6个分离毒制成的灭活油乳苗免疫鸡后，对经典毒E48F9亦产生100％保护率。这表明，从目前发病鸡群中分离的NDV毒株与La Sota弱毒株、标准F48E9强毒株间有很好的交叉免疫保护作用。 相似文献
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Isolation of a monoclonal antibody with specificity for commonly employed vaccine strains of Newcastle disease virus 总被引：2，自引：0，他引：2
A monoclonal antibody, AVS-I, was produced from a hybridization of murine myeloma cells and splenocytes from mice immunized with the La Sota strain of Newcastle disease virus (NDV). The hybridoma producing AVS-I, selected from 184 NDV-positive supernatants, is one of two supernatants that reacted exclusively with lentogenic strains in an indirect enzyme-linked immunosorbent assay. AVS-I can also be assayed by hemagglutination-inhibition (HI), which was used to test selected reference avian paramyxovirus (PMV) strains of types 1 to 3. NDV vaccines La Sota and B1 and field isolates from chickens, turkeys, pigeons, and cockatoos were also used as antigens. AVS-I had a high binding affinity for all La Sota and B1 strains, including vaccines. The antibody bound with a lower titer to the Australian Queensland V4 and Ulster strains, but it did not bind to the F strain, a lentogenic strain from England. AVS-I was HI-negative against the other PMV reference strains. AVS-I may be valuable for identifying field isolates antigenically similar to La Sota and B1 and rapidly differentiate those vaccine strains from more virulent viruses. 相似文献
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XIONG Xiaoyan QIN Zhenbin MO Hongfang HE Dongxian YU Lintian XU Jiarong 《中国畜牧兽医》2007,47(12):4032-4040
This study was designed to evaluate the synergistic effect of VA5 immunopotentiator on pigeon ND4416 inactivated vaccine.160 healthy pigeons were randomly divided into four groups,including ND4416 strain inactivated vaccine group (NDV group),ND4416 strain inactivated vaccine and immunopotentiator (VA5) mixed group (NDV+VA5 group),La Sota inactivated vaccine group (La Sota group) and normal saline as the control group (C group),to assess their vaccine efficacy against virulent pigeon NDV by serological analysis and animal testing.Pigeons sera were collected at different time points after immunization and measured the HI antibody titer of each group.The results showed that VA5 immunopotentiator significantly improved the serum antibody level of pigeons immunized with pigeon Newcastle disease inactivated vaccine (P<0.05).In addition,comparative test of spleen lymphocyte transformation was conducted at various time points after immunization.The results indicated that VA5 effectively stimulated the lymphocyte transformation of immune pigeon.Pigeons in each groups were challenged with ND4416 strain at the 30th,90th and 180th d after immunization.The results presented that the NDV+VA5 group had 100% protection rate and higher than La Sota group.The duration of immunization test showed that the antibody titer of NDV+VA5 group reached peak 11.20log2 at the 21st d,remained 7.50log2 at 180th d,and the protection rate remained 100% at 180th d.It indicated that VA5 immunopotentiator sustained the immune duration of pigeon NDV vaccine up to 180 d.Moreover,the in vitro detoxification test results suggested that VA5 immunopotentiator reduced the in vitro detoxification cycle of pigeons after challenge.Overall,this study suggested VA5 immunopotentiator could significantly improve the immune efficacy of pigeon Newcastle disease inactivated vaccine,which provided a basis for further enhancing the efficacy of Newcastle disease vaccine,as well increased experimental data for the application of immunopotentiators. 相似文献
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试验旨在探究VA5免疫增强剂对鸽新城疫病毒（NDV）灭活疫苗（ND4416株）的免疫增效作用。选取160只健康鸽随机分为4组：ND4416株灭活疫苗组（NDV组）、ND4416株灭活疫苗与免疫增强剂（VA5）混合组（NDV+VA5组）、La Sota灭活疫苗组（La Sota组）及生理盐水空白对照组（C组）,进行免疫效力及免疫持续期试验。采用血凝抑制试验检测各组鸽免疫后不同时间点的血清抗体效价,结果显示,VA5免疫增强剂能够显著提高鸽NDV灭活疫苗血清抗体水平（P<0.05）。脾脏淋巴细胞转化试验结果显示,VA5能够有效刺激免疫鸽的淋巴细胞转化。在免疫后第30、90、180天,各组鸽子采用ND4416株进行攻毒试验,结果显示,NDV+VA5组在3个时间点的攻毒保护率均为100%,均高于La Sota组。免疫持续期试验结果显示,NDV+VA5组血清抗体水平在免疫后第21天达峰值11.20log2,第180天仍能达到7.50log2,攻毒保护率达100%,表明VA5免疫增强剂可延长鸽新城疫疫苗的免疫效力持续期至180 d。攻毒后体外排毒检测结果表明,VA5免疫增强剂能够缩短攻毒后鸽的体外排毒周期,减少体外排毒。综上,VA5免疫增强剂能够显著提高鸽NDV灭活疫苗的免疫效果,为研制效果更好的鸽NDV疫苗提供了基础依据,同时也为免疫增强剂的应用增加了试验数据。 相似文献
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NDVLaSota、V4疫苗免疫鸡及免疫攻毒鸡的主要特异性血清抗体动态变化规律比较 总被引：2，自引：0，他引：2
本研究应用间接ELISA方法对新城疫LaSota和V4疫苗免疫SPF鸡及免疫后攻毒SPF鸡的血清中新城疫病毒（NDV）特异性HI抗体、IgM和IgG抗体水平的动态变化进行了检测。结果表明，V4较LaSota疫苗免疫鸡HI抗体提前3天左右出现，但除高峰期（1周左右）外，其HI抗体水平均低于LaSota免疫鸡。LaSota免疫鸡。LaSota疫羁免疫鸡血清中NDV特异性IgM和IgGr抗体高峰较V4免疫鸡提前约2周出现，攻毒后，LaSota免疫鸡血清中特异性IgG和IgG回忆应答显著，而V4免疫鸡IgM和IgG回忆应答不明显。 相似文献
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ZHANG Zhen-hua LI Lin ZHANG Jian-wei SHEN Jia SHI Ai-hua HUANG Feng-jun ZHENG Xiao-lan JIANG Bei-yu 《中国畜牧兽医》2016,43(5):1374-1378
1-day-old SPF chickens and commercial Jingfen chickens were vaccinated with IBD immune complex(IC) vaccine, NDV La Sota vaccine were inoculated simultaneously every one week and every two weeks.NDV La Sota immunization alone was as the control group.At the 2nd, 3rd, 4th and 5th week post inoculation, blood samples were taken and the ND HI antibody were tested.Experimental chickens were challenged with high virulent NDV at the 5th week post inoculation, the protective rate of each group was calculated.The results showed the ND HI antibody were not significant different in the combined immunization of IBD IC vaccine priming and NDV La Sota vaccine boost and NDV La Sota vaccine alone immunization (P>0.05).The results indicated that IBD IC vaccine has no immunosuppression on NDV La Sota vaccine in SPF chickens and commercial Jingfen chickens. 相似文献
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The immunogenicity of three Newcastle disease virus (NDV) strains--V4, Hitchner B1 and La Sota, was assessed in chickens that had varying levels of maternal antibody to the virus. Chickens were immunised at different ages by the eye drop and aerosol methods. The immune response of chickens to similar doses of the strains was affected by the presence of maternal antibody. Both the level of maternal antibody and the strain of virus used affected the result. Strain La Sota was least affected as it took higher levels of maternal antibody to depress response to it than were required to have a similar effect on Hitchner B1 and V4. Strain V4 was the strain most affected by circulating maternal antibody. The results demonstrated that strain V4 was less immunogenic than Hitchner B1 and La Sota when used in chickens with maternal antibody to NDV. 相似文献
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Protective efficacy of commercial Newcastle disease vaccines against challenge of goose origin virulent Newcastle disease virus in geese 总被引：1，自引：0，他引：1
Since 1997, severe outbreaks of Newcastle disease (ND) in geese in many regions throughout China have resulted in high morbidity and mortality, and great economic loss to farmers; however, no licensed, specific vaccine is yet available for this disease in China. In this study, goslings were immunized with different combinations and dosages of several commercial ND vaccines including La Sota vaccine, Mukteswar vaccine, recombinant live vaccine against avian influenza (AI) and ND (rL-H5 strain), and inactivated ND oil-emulsion vaccine (La Sota strain). The protective effects were evaluated based upon the level of antibody response and the degree of protection against the goose-origin virulent NDV strain. The result showed that two doses (i.e., one more than that for chicken) of La Sota vaccine priming, followed by 2-5 doses of Mukteswar vaccine boosting 2-3 weeks later, not only induced higher HI antibody levels, but also conferred longer-lasting protection. This immunization procedure can be recommended for prevention of ND in geese. 相似文献