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Post vaccination and colostral peste des petits ruminants antibody dynamics in research flocks of Kirdi goats and Foulbe sheep of north Cameroon 总被引:2,自引:0,他引:2
We studied Kirdi goats and Foulbe sheep kept on-station at the Institute of Agricultural Research for Development (IRAD), Garoua to look at their immunological response following vaccination with a specific peste des petits ruminant (PPR) virus vaccine. Pre-vaccination PPR antibody seroprevalences were 44 and 29% in goats and sheep, respectively. Seroprevalences following vaccination were 100% in both species. Titres remained above the protection threshold level (1:10) in both species at 12 months. Maternal antibodies in young animals were detectable to up to 6 months of age but fell below the protection threshold level at 3.5 and 4.5 months in lambs and kids, respectively. Kids and lambs from immunised or exposed dams should be vaccinated at 4 and 5 months of age, respectively. 相似文献
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Khan HA Siddique M Sajjad-ur-Rahman Abubakar M Ashraf M 《Tropical animal health and production》2008,40(7):521-527
Monoclonal antibody-based competitive ELISA (C-ELISA) has been used for the specific measurement of antibodies to peste des petits ruminants (PPR) viruses in sheep, goats, cattle and Buffalo. Serum samples from sheep (n = 232), goats (n = 428), cattle (n = 43), buffalo (n = 89) were tested. The animals had not been vaccinated against rinderpest or PPR. Findings suggested that the sero-positive cases were significantly higher in sheep (51.29%) than in goats (39.02%) (P = 0.002). The overall sero-prevalence of PPRV in small ruminants was 43.33%. The PPR antibodies seroprevalence was 67.42% in buffalo and 41.86% in cattle which was significantly higher in buffalo (P = 0.005). The overall sero-prevalence of PPRV in large ruminants was 59.09%. Cattle and buffalo sera showed a high prevalence of antibody against PPR virus which may explain the difficulty experienced in achieving high post-vaccination immunity levels against rinderpest. Because antibodies against PPR virus are both cross-neutralizing and cross-protective against rinderpest virus, further vaccination in the presence of antibodies against PPR virus may be a waste of national resources. It was also suggested that antibodies to PPR virus could prevent an immune response to the rinderpest vaccine. This paper presents serological evidence for the transmission of PPR virus from sheep and goats to cattle and buffalo and highlights the need to include PPR serology in the sero-monitoring programme to give a better indication of national herd immunity of sheep and goats against PPR. 相似文献
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Khan HA Siddique M Arshad M Abubakar M Akhtar M Arshad MJ Ashraf M 《Tropical animal health and production》2009,41(4):427-430
A total of 70 sheep and 330 goats were selected randomly. All the animals were kept under same housing and management conditions.
Serum samples were collected from all the animals and tested for the presence of antibodies against Peste des petits ruminants
(PPR) virus using competitive ELISA (cELISA). All the animals were found negative showing percentage inhibition (PI) values
<50. The animals were vaccinated against PPR with Nig/75/1 strain vaccine of PPR Serum samples were collected from randomly
selected 12 sheep and 30 goats at 10, 30 and 45 days post-vaccination. The samples were subjected to cELISA to determine the
presence of antibodies against PPRV. The samples with PI >50 were considered as sero-positive. The sheep found positive at
10, 30 and 45 days post-vaccination were 1(8.3%), 7(58.3%) and 12(100%) respectively. In case of goats 3(10.0%), 29(96.6%)
and 27(90.0%) animals gave positive results at 10, 30 and 45 days post-vaccination respectively. Mean PI values in sheep at
10, 30 and 45 days post-vaccination were recorded as 37, 65 and 91 respectively, whereas in goats these values were 43, 78
and 86 respectively. 相似文献
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Ezeibe MC Okoroafor ON Ngene AA Eze JI Eze IC Ugonabo JA 《Tropical animal health and production》2008,40(7):517-519
Peste des petits ruminants (PPR) disease was confirmed in West African Dwarf goats. They were managed symptomatically with antibiotics and antidarrhoeics. Following clinical recovery, faeces were collected every week from 40 recovered goats to monitor excretion of the PPR virus haemagglutinins in their faeces. All the 40 recovered goats shed the PPR virus haemagglutinins for 11 weeks post recovery. Nine goats (22.5%) continued shedding the viral antigen 12 weeks post recovery. There was correlation between weekly mean haemagglutination titre of the PPR virus and time post recovery with r = -0.7504 (p < 0.01). 相似文献
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2007年小反刍兽疫(PPR)在我国西藏首次暴发,在西藏和新疆部分地区使用PPR Nigeria 75/1疫苗株制造的疫苗进行免疫接种。为明确疫苗的安全性,中国兽医药品监察所国家牛瘟参考实验室对其安全性能进行了系统评价。健康易感山羊、绵羊及怀孕山羊、怀孕绵羊按不同剂量接种疫苗后,均未观察到异常临床反应;怀孕母羊所产羔羊数量与对照组无明显差异。疫苗对小白鼠、豚鼠的非特异性安全试验表明,所有接种动物均健活。结果表明该疫苗安全性良好,可在田间大规模使用。 相似文献
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《Veterinary microbiology》2015,175(1):132-138
Nucleoprotein (NP) is the most abundant and highly immunogenic protein of morbillivirus, and is presently the basis of most diagnostic assays for peste des petits ruminants virus (PPRV). In this study, fine epitope mapping and conservation analysis of linear B-cell epitopes on the PPRV NP has been undertaken using biosynthetic peptides. Nineteen linear B-cell epitopes were identified and their corresponding minimal motifs were located on the NP of PPRV China/Tibet/Geg/07-30. Conservation analysis indicated that ten of the 19 minimal motifs were conserved among 46 PPRV strains. Peptides containing the minimal motifs were recognized using anti-PPRV serum from a goat immunized with PPRV vaccine strain Nigeria 75/1. Identified epitopes and their motifs improve our understanding of the antigenic characteristics of PPRV NP and provide a basis for the development of epitope-based diagnostic assays. 相似文献
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试验旨在探讨羊口蹄疫与小反刍兽疫疫苗单独与联合免疫对动物保护情况,为缓解动物应激、提高免疫效果提供研究依据。选取2 106只昌吉州辖区7个地区的散养羊,采用液相阻断ELISA方法检测口蹄疫O型、A型抗体效价,ID Screen小反刍兽疫病毒抗体检测试剂盒检测小反刍兽疫抗体效价,分析各地区不同年份羊口蹄疫O型、A型和小反刍兽疫免疫抗体效果,比较单独免疫与联合免疫的免疫结果。结果显示,2018、2019、2020年口蹄疫抗体合格率分别为85.65%、93.86%、92.22%;2018、2019、2020年小反刍兽疫抗体合格率分别为76.99%、86.46%、88.59%。研究表明,2019、2020年口蹄疫和小反刍兽疫联合免疫效果保护性好于2018年,联合免疫效果良好,达到预期的免疫效果。 相似文献
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Comparative nucleotide sequence analysis of the phosphoprotein gene of peste des petits ruminants vaccine virus of Indian origin 总被引:2,自引:0,他引:2
Muthuchelvan D Sanyal A Sarkar J Sreenivasa BP Bandyopadhyay SK 《Research in veterinary science》2006,81(1):158-164
The nucleotide sequences of the phosphoprotein (P) gene of peste des petits ruminants (PPRV) vaccine virus (PPRV Sungri/96) belongs to Asian lineage have been determined and the deduced amino acid sequences were compared with another vaccine strain PPRV/Nigeria75/1 and with those of the other morbilliviruses. The 1652 nucleotides of the P gene encode a phosphoprotein of 509 amino acid residues (from nucleotide numbers 60 to 1587), which is 91% identical to that of PPRV/Nigeria75/1. The C protein consists of 177 amino acid residues and is 91% identical with that of PPRV/Nigeria75/1. The conserved mRNA editing site (5'TTAAAAGGGCACAG) was present at positions 742-756 in the P gene, which is conserved in all other morbilliviruses. The CTT trinucleotide sequence is present at the N/P and P/M intergenic region, which is totally conserved in morbilliviruses. This will be the third sequence for the P gene of PPRV since that of the vaccine strain and a wild-type Turkish isolate has been published already. 相似文献
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Peste des petits ruminants virus (PPRV) has a non-segmented negative sense RNA genome and is classified within the Morbillivirus genus of the Paramyxoviridae. Using the Bac-to-Bac® baculovirus expression system, we constructed recombinant baculoviruses that were able to co-express the PPRV matrix and nucleocapsid proteins in insect cells under the control of the polyhedron and p10 promoters, respectively. The results showed that although both structural proteins were expressed at a relatively low level, the interaction between them caused the formation of virus-like particles (VLPs) by viewing of transmission electron microscopy. The VLPs morphologically resembled authentic PPRVs but lacked spikes protruding from the particulate surfaces. Interestingly, the diameter of PPRV VLPs ranged from 100 to 150 nm, far less than the mean diameter (400–500 nm) of parental virions. 相似文献
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为了建立鉴别检测小反刍兽疫疫苗毒与野毒的快速分子生物学检测方法,通过对自行测序的疫苗毒基因组序列及GenBank中登录的野毒基因组序列进行比对分析,设计了2套引物和TaqMan荧光探针,对实时荧光RT-PCR反应条件进行优化,建立了小反刍兽疫疫苗毒与野毒实时荧光RT-PCR鉴别检测方法。特异性试验证实,该检测方法只能检测到目的病毒核酸,表明其具有良好的特异性。灵敏性试验发现,检测疫苗株的最低检测限可达1.38mg/L的总RNA,检测野毒株的最低检测限为0.16mg/L的核酸。对同一样品进行重复性检测,检测的荧光扩增曲线阈值完全重舍,证明其重复性极好。从180份临床样品中,检测出2份疫苗病毒株阳性样品,其余均为阴性。结果表明,本研究所建立的实时荧光RT-PCR方法能对小反刍兽疫疫苗毒及野毒进行鉴别检测,具有特异性好、灵敏度高、重复性极好的优点,是开展小反刍兽疫疫情监测的有力工具。 相似文献
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小反刍兽疫病毒RT-LAMP检测方法的建立 总被引:1,自引:0,他引:1
利用逆转录环介导等温核酸扩增技术(RT-LAMP)建立了小反刍兽疫病毒快速检测方法,同时评价了该方法的灵敏性和特异性。结果表明,根据小反刍兽疫病毒N基因保守区域设计的LAMP引物能够在63℃恒温下,1小时内实现目的核酸的大量扩增,由于在检测前加入荧光指示试剂,检测结果可以直接用肉眼判断,避免了由于开盖检验带来的扩增产物污染导致的假阳性。该检测体系具有较高的特异性,只能特异性地检测目的病毒,与其他同属的病毒或类似病毒等无交叉反应;具有较高的检测灵敏度,比普通RT-PCR灵敏性高10倍,与荧光RT-PCR的灵敏度相当。 相似文献
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F D Adu T Joannis E Nwosuh A Abegunde 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,43(1):23-26
Progressive loss of virulence for goat kids was noticed when peste des petits ruminants (PPR) virus was passaged in Vero cells. While goats inoculated with the 60th passage suffered from the clinical PPR disease and mortality, goats inoculated with the 80th passage did not show any sign of the disease. If the progressive loss of virulence of the virus with passage continues, it will not be long before a homologous PPR vaccine will be obtained at the National Veterinary Institute, Vom. 相似文献