共查询到19条相似文献，搜索用时 156 毫秒
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Bosworth B Erdman MM Stine DL Harris I Irwin C Jens M Loynachan A Kamrud K Harris DL 《Comparative immunology, microbiology and infectious diseases》2010,33(6):e99-e103
An alphavirus derived replicon particle (RP) vaccine expressing the cluster IV H3N2 swine influenza virus (SIV) hemagglutinin (HA) gene induced protective immunity against homologous influenza virus challenge. However, pigs with maternal antibody had no protective immunity against challenge after vaccination with RP vaccines expressing HA gene alone or in combination with nucleoprotein gene. 相似文献
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猪流感诊断技术研究进展 总被引：3，自引：0，他引：3
猪流感是由甲型流行性感冒病毒感染引起的一种急性呼吸道传染病。除常规的临床症状及病理变化诊断外,猪流感的确诊依赖于实验室诊断方法,方法主要有电镜技术、病毒分离和鉴定、血清学试验、免疫学试验、分子生物学方法等。作者从传统的实验室诊断技术和分子生物学诊断技术两个方面综合阐述了猪流感的诊断研究进展,为SIV的临床快速诊断和深入研究提供科学依据。 相似文献
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Intratracheal inoculation of a field isolate of influenza A H1N1 caused high fever, anorexia and dyspnoea in unvaccinated pigs. In a limited study, it was shown that animals vaccinated once with an inactivated influenza A H1N1 strain showed partial protection at challenge, indicated by mild or absent clinical signs and by the suppression of viral replication. There appeared to be a correlation between the hemagglutination-inhibition titers of the serum of vaccinated pigs and the degree of protection. Animals vaccinated with two spaced injections were completely protected at challenge. Viral replication was inhibited in their respiratory tract since no virus was isolated from animals at slaughter and no increase in antibody titer was observed in challenged vaccinates followed serologically. It was concluded that vaccination of swine against influenza with an inactivated vaccine can result in a protective immunity in the respiratory tract. The New Jersey vaccine strain could protect against swine influenza strains (H1N1) currently prevalent in several European countries. 相似文献
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Analysis of the quality of protection induced by a porcine influenza A vaccine to challenge with an H3N2 virus 总被引：3，自引：0，他引：3
Heinen PP van Nieuwstadt AP de Boer-Luijtze EA Bianchi AT 《Veterinary immunology and immunopathology》2001,82(1-2):39-56
Antigenic drift of swine influenza A (H3N2) viruses away from the human A/Port Chalmers/1/73 (H3N2) strain, used in current commercial swine influenza vaccines, has been demonstrated in The Netherlands and Belgium. Therefore, replacement of this human strain by a more recent swine H3N2 isolate has to be considered. In this study, the efficacy of a current commercial swine influenza vaccine to protect pigs against a recent Dutch field strain (A/Sw/Oedenrode/96) was assessed. To evaluate the level of protection induced by the vaccine it was compared with the optimal protection induced by a previous homologous infection. Development of fever, virus excretion, and viral transmission to unchallenged group mates were determined to evaluate protection. The vaccine appeared efficacious in the experiment because it was able to prevent fever and virus transmission to the unchallenged group mates. Nevertheless, the protection conferred by the vaccine was sub-optimal because vaccinated pigs excreted influenza virus for a short period of time after challenge, whereas naturally immune pigs appeared completely protected. The immune response was monitored, to investigate why the vaccine conferred a sub-optimal protection. The haemagglutination inhibiting and virus neutralising antibody responses in sera, the nucleoprotein-specific IgM, IgG, and IgA antibody responses in sera and nasal secretions and the influenza-specific lymphoproliferation responses in the blood were studied. Vaccinated pigs developed the same or higher serum haemagglutination inhibiting, virus neutralising, and nucleoprotein-specific IgG antibody titres as infected pigs but lower nasal IgA titres and lymphoproliferation responses. The lower mucosal and cell-mediated immune responses may explain why protection after vaccination was sub-optimal. 相似文献
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Lim YK Takada A Tanizaki T Ozaki H Okazaki K Kida H 《The Japanese journal of veterinary research》2001,48(4):197-203
Effective vaccinations against swine influenza reduce the economic loss of pig industries, and also may minimize the possibility of emergence of new pandemic viruses, since pigs are intermediate hosts to generate reassortant viruses among avian and mammalian influenza viruses. In this study, we showed that intranasal immunization of pigs with formalin-inactivated or ether-split influenza vaccine (A/Aichi/2/68) induced virus-specific IgG, IgM, and IgA antibodies in their nasal secretions and sera, resulting in complete protection from virus challenge. Antibody response to the challenge virus was not observed in the immunized pigs, suggesting that the replication of the virus in the primary targets, respiratory epithelial cells, was inhibited. The present results indicate that intranasal immunization of pigs with inactivated vaccines is effective to control swine influenza, and also provide a good model, as well as a mouse model, to evaluate an intranasal application of influenza vaccine for humans. 相似文献
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猪流感病毒研究进展 总被引：10，自引：1，他引：10
猪流感是由猪流感病毒引起的一种呼吸道传染病。目前 ,此病在世界各地都有发生 ,危害严重 ,经济损失巨大 ,并对人类的健康构成威胁。猪流感病毒属于正黏病毒科 A型流感病毒属 ,病毒粒子多形态。该病毒对热、消毒剂敏感 ,而对干燥和低温的抵抗力强大。其分子特性为多节段的 RNA病毒 ,由 8个片段组成 ,分别编码 1 0种蛋白质。猪流感病毒能够在多种动物的细胞上增殖 ,但病毒分离和疫苗生产时 ,经常采用鸡胚接种。病毒具有血凝活性 ,但不同毒株的抗原性无明显的区分。由于病毒受到抗体的压力很大 ,因此病毒的变异频繁 ,其机理涉及分子水平的抗原漂移和抗原转变。文章对病毒的理化、生物学特性、分子特性、病毒的蛋白和基因变异等方面的研究情况进行了综述 相似文献
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Investigations of the efficacy of European H1N1- and H3N2-based swine influenza vaccines against the novel H1N2 subtype 总被引：3，自引：0，他引：3
The efficacy of a commercial swine influenza vaccine based on A/New Jersey/8/76 (H1N1) and A/Port Chalmers/1/73 (H3N2) strains was tested against challenge with an H1N2 swine influenza virus. Influenza virus-seronegative pigs were vaccinated twice with the vaccine when they were four and eight weeks old, or with the same vaccine supplemented with an H1N2 component. Control pigs were left unvaccinated. Three weeks after the second vaccination, all the pigs were challenged intratracheally with the swine influenza strain Sw/Gent/7625/99 (H1N2). The commercial vaccine induced cross-reactive antibodies to H1N2, as detected by the virus neutralisation (VN) assay, but VN antibody titres were 18 times lower than in the pigs vaccinated with the H1N2-supplemented vaccine. The challenge produced severe respiratory signs in nine of 10 unvaccinated control pigs, which developed high H1N2 virus titres in the lungs 24 and 72 hours after the challenge. Vaccination with the commercial vaccine resulted in milder respiratory signs, but H1N2 virus replication was not prevented. Mean virus titres in the pigs vaccinated with the commercial vaccine were 1-5 log10 lower than in the controls at 24 hours but no different at 72 hours. In contrast, the H1N2-supplemented vaccine prevented respiratory disease in most pigs. There was a 4-5 log10 reduction in the mean virus titre at 24 hours in the pigs vaccinated with this vaccine, and no detectable virus replication at 72 hours. These data indicate that the commercial swine influenza vaccine did not confer adequate protection against the H1N2 subtype. 相似文献
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猪繁殖与呼吸综合征(porcine reproductive and respiratory syndrome,PRRS)是一种主要表现为母猪繁殖障碍与仔猪呼吸道症状的传染病。近年来,猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus,PRRSV)变异株不断出现,免疫逃避及持续性感染使得猪群发病率或复发率均相继增高,给养猪业带来了巨大的损失。目前所采用的胃肠道途径接种活疫苗或灭活疫苗的方法无法诱导对猪群的全面保护作用。为减少养猪业的经济损失,亟需研制新防制方法和新疫苗接种途径。作者主要从黏膜免疫的免疫部位、呼吸道保护性黏膜免疫反应诱导、黏膜免疫途径、佐剂的选择及病毒的免疫抑制反应等方面简要论述了有效防制PRRSV的黏膜免疫方法的研究进展,为进一步了解黏膜免疫抵御PRRSV突变株感染及黏膜疫苗研制等方面提供有用的信息。 相似文献