共查询到19条相似文献，搜索用时 593 毫秒
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雏鸡在感染IBDV后红细胞免疫功能变化的研究 总被引：20，自引：1，他引：19
在经ＩＢＤ弱毒苗免疫和未免疫的３０～５９日龄ＡＡ鸡研究了感染ＩＢＤＶ后红细胞免疫功能的变化。结果表明：从以ＩＢＤＶ攻毒前１天到攻毒后头５天内,未免疫攻毒鸡（Ａ组）和免疫攻毒鸡（Ｂ组）ＲＢＣ－ＣＲ１花环率降低或显著降低,而未免疫未攻毒鸡（Ｃ组）没有类似变化,高于Ｂ组,明显高于Ａ组,以后Ａ和Ｂ组逐渐回升到攻毒前水平。Ａ和Ｂ组ＲＢＣ－ＩＣ花环率在ＩＢＤＶ攻毒后第５天明显降低,均显著低于Ｃ组水平,以后Ａ组仍处于较低水平上变动,Ｂ组即逐渐回升,三组比较,Ａ组仍低于Ｃ组,同时也低于Ｂ组。 相似文献
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网状内皮组织增殖病病毒感染鸡红细胞免疫功能的动态变化 总被引：6，自引：0，他引：6
对１日龄ＳＰＦ鸡分别腹腔接种３株禽网状内皮组织增殖病病毒（ＲＥＶ）的ＲＥＶ－Ｔ，ＤＩＡ和Ｃ４８株，测得试验鸡红细胞补体（Ｃ３ｂ）受体花环率自接种后１１ｄ起显著低于对照组；而红细胞免疫复合物（ＩＣ）花环率从接种后２５ｄ起（３２ｄ除外），又显著高于对照组。接种不同ＲＥＶ毒株的鸡红细胞Ｃ３ｂ受体花环率和ＩＣ花环率的变化程度不一致，表明不同毒株引起的免疫抑制程度不同。 相似文献
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鸡包涵体肝炎病毒（IBHV）对雏鸡淋巴细胞和红细胞免疫功能的影响 总被引：9，自引：0，他引：9
为探讨鸡包涵体肝炎病毒（ Ｉ Ｂ Ｈ Ｖ）引起免疫抑制的机理，给 １ 周龄雏鸡经口感染鸡Ⅷ型腺病毒，观察了感染后不同时间血液淋巴细胞转化率、 Ｒ Ｂ Ｃ Ｃ３ｂ 受体花环率和 Ｒ Ｂ Ｃ Ｉ Ｃ 花环率的动态变化。结果表明，淋巴细胞转化率和 Ｒ Ｂ Ｃ Ｃ３ ｂ 受体花环率于感染后 ３ ｄ 开始下降，至 ９ ｄ 降至最低，显著低于对照组（ Ｐ ＜ ００１）； Ｒ Ｂ Ｃ Ｉ Ｃ 花环率于感染后 ５ ｄ 开始升高，至 １１ ｄ 达最高，显著高于对照组（ Ｐ ＜ ００１）。证实 Ｉ Ｂ Ｈ Ｖ 能够引起淋巴细胞和红细胞免疫功能降低。 相似文献
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北京鸭红细胞免疫功能初探 总被引：9，自引：2，他引：7
应用改进的红细胞Ｃ＿３ｂ６受体花环和红细胞免疫复合物花环试验，对３２例成年北京鸭红细胞免疫功能进行研究。证实北京鸭红细胞除了传统观念上的功能外，还具有Ｃ＿３ｂ受体（即ＣＲ＿１，ＣｏｍｐｌｅｍｅｎｔＲｅｃｅｐｔｏｒｔｙｐｅＩ），可借助ＣＲ＿１进行免疫粘连（ＩＡ），并以此为基础发挥多种免疫防御机制，即ＲＣＩＳ概念亦适用于北京鸭。文中还对鸭ＲＣＩＳ的生物学作用和临床诊断价值进行了探讨，并对两种花环率的含义作出了新的解释。 相似文献
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以正常鸡胚尿囊液和环磷酰胺预处理试验兔, 再以Ⅰ型鸭肝炎病毒（Ｄｕｃｋ Ｈｅｐａｔｉｔｉｓ Ｖｉｒｕｓ Ｔｙｐｅ Ⅰ, ＤＨＶ Ⅰ） 标准强毒（ＡＴＣＣ, Ｃ９／Ｄ２） 接种后致死鸡胚的尿囊液, 经灭活、乳化制成油佐剂抗原多次免疫试验兔, 获得了鸡胚中和效价（ＥＰＤ５０） 达１∶３２ 以上的兔抗Ⅰ型鸭肝炎病毒高免血清（ＤＨＶ ⅠＳ） 。 相似文献
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淫羊藿－蜂胶合剂对鸡红细胞CR_1增强作用的实验研究 总被引：1，自引：0，他引：1
用不同浓度的淫羊藿－蜂胶合剂与鸡红细胞在体外进行孵育，然后测其红细胞补体Ｉ型受体（ＣＲ１）的活性，以判定淫羊霍－蜂胶合剂对红细胞免疫功能的增强作用。结果显示：经２０％、１０％和５％的淫羊藿－蜂胶合剂处理后的鸡红细胞ＣＲ１花环率（ＣＲ１－Ｒ）分别为：３８．９％、２２．０％和９．０％，面对照组鸡红细胞ＣＲ１－Ｒ是９．３％。此结果表明：淫羊藿－蜂胶合剂具有明显的增高红细胞ＣＲ１活性作用，并与剂量有关。 相似文献
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禽流感病毒血凝素基因的克隆及其DNA疫苗的免疫原性 总被引：22，自引：3，他引：19
禽流感病毒（ＡＩＶ）的表面结构蛋白血凝素（ＨＡ）是其主要保护性抗原。本研究参考已发表的Ｈ７亚型ＡＩＶ的ＨＡ基因序列，设计合成了１对Ｈ７ＨＡ特异引物，以ＡＩＶＡ／Ａｆｒｉ．Ｓｔａｒ．／Ｅｎｇ－Ｑ／９８３／７９／（Ｈ７Ｎ１）（Ａ／Ａｆｒｉ．Ｓｔａｒ．／Ｅｎｇ）核酸为模板，通过ＲＴ－ＰＣＲ扩增出１条１．７ｋｂｃＤＮＡ片段。将这一片段定向克隆到ｐＵＣ１８中，对其５′端及３′端部分序列测定后，确证其为ＨＡｃＤＮＡ。将ＨＡ基因置于ＳＶ４０启动子和增强子下游，构建了这一基因的真核表达质粒ｐＳＶＨ７。以此质粒１００μｇ肌肉注射免疫３周龄ＳＰＦ鸡６只，４周后以１００倍鸡胚感染剂量（ＥＩＤ）的ＨＡ基因同源病毒对所有鸡进行攻毒，１周后以棉拭子进行泄殖腔病毒分离；免疫后１～６周每周对所有鸡翅静脉采血，分离血清，检测ＨＩ抗体。结果，１００μｇ免疫组鸡病毒分离数为０／６，对照组为６／６；攻毒后１周免疫组鸡ＨＩ效价为１∶３２～１∶６４，对照组为１∶４～１∶１６。表明所构建的ＨＡ基因表达质粒可作为基因疫苗诱导鸡产生免疫保护反应。 相似文献
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应用葡萄球菌A蛋白协同凝集试验快速检测鸭肝炎病毒的研究 总被引：9，自引：2，他引：7
用提纯的鸭肝炎病毒（ＤＨＶ）免疫家兔制备高免血清，常规方法提取ＩｇＧ，与１％葡萄球菌Ａ蛋白（ＳＰＡ）阳性菌悬液混合，以ＰＨ７．２０．２ｍｏｌ／ＬＰＢＳ作缓冲液，制成鸭病毒性肝炎（ＤＶＨ）ＳＰＡ协同凝集试验（ＳＰＡ－ＣｏＡ）诊断试剂，同时制备阴性对照试剂。用ＳＰＡ－ＣｏＡ检测人工感染致死的雏鸭肝脏、含ＤＨＶ强毒的鸭胚液、适应鸡胚的疫苗毒鸡胚尿囊毒的检出率均为１００％。用ＳＰＡ－ＣｏＡ检测强毒时，样品 相似文献
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本文选用１０株ＮＤＶ疫苗、１０株ＮＤＶ／ＩＢＶ联苗，察接种２周龄雏鸡后对头部相关淋巴组织（ＨＡＬＴ）的影响。通过对接种鸡进行一系列体内试验，检测了哈德氏腺（ＧＨ）对布氏杆菌灭活抗原滴眼的反应情况。根据这一结果，对ＨＡＬＴ的几个部位和支气管进行组织学检查，并见到有微观变化。本研究表明：３种ＮＤＶ／ＩＢＶ联苗（１株Ｂ１／Ｍａｓｓ＆Ｃｏｎｎ、２株ＬａＳｏｔａ／Ｍａｓｓ＆Ｃｏｎｎ）可干扰ＧＨ对布氏抗原的反 相似文献
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Transmission and immunopathology of the avian influenza virus A/Anhui/1/2013 (H7N9) human isolate in three commonly commercialized avian species 
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下载免费PDF全文 B. Vidaña R. Dolz N. Busquets A. Ramis R. Sánchez R. Rivas R. Valle I. Cordón D. Solanes J. Martínez N. Majó 《Zoonoses and public health》2018,65(3):312-321
H7N9 virus infection is a global concern, given that it can cause severe infection and mortality in humans. However, the understanding of H7N9 epidemiology, animal reservoir species and zoonotic risk remains limited. This work evaluates the pathogenicity, transmissibility and local innate immune response of three avian species harbouring different respiratory distribution of α2,6 and α2,3 SA receptors. Muscovy ducks, European quails and SPF chickens were intranasally inoculated with 105 embryo infectious dose (EID)50 of the human H7N9 (A/Anhui/1/2013) influenza isolate. None of the avian species showed clinical signs or macroscopic lesions, and only mild microscopic lesions were observed in the upper respiratory tract of quail and chickens. Quail presented more severe histopathologic lesions and avian influenza virus (AIV) positivity by immunohistochemistry (IHC), which correlated with higher IL‐6 responses. In contrast, Muscovy ducks were resistant to disease and presented higher IFNα and TLR7 response. In all species, viral shedding was higher in the respiratory than in the digestive tract. Higher viral shedding was observed in quail, followed by chicken and ducks, which presented similar viral titres. Efficient transmission was observed in all contact quail and half of the Muscovy ducks, while no transmission was observed between chicken. All avian species showed viral shedding in drinking water throughout infection. 相似文献
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Ok-Mi Jeong Min-Chul Kim Min-Jeong Kim Hyun-Mi Kang Hye-Ryoung Kim Yong-Joo Kim Seong-Joon Joh Jun-Hun Kwon Youn-Jeong Lee 《Journal of veterinary science (Suw?n-si, Korea)》2009,10(1):53-60
Highly pathogenic avian influenza viruses (HPAIV) of the H5N1 subtype have spread since 2003 in poultry and wild birds in Asia, Europe and Africa. In Korea, the highly pathogenic H5N1 avian influenza outbreaks took place in 2003/2004, 2006/2007 and 2008. As the 2006/2007 isolates differ phylogenetically from the 2003/2004 isolates, we assessed the clinical responses of chickens, ducks and quails to intranasal inoculation of the 2006/2007 index case virus, A/chicken/Korea/IS/06. All the chickens and quails died on 3 days and 3-6 days post-inoculation (DPI), respectively, whilst the ducks only showed signs of mild depression. The uninoculated chickens and quails placed soon after with the inoculated flock died on 5.3 and 7.5 DPI, respectively. Both oropharyngeal and cloacal swabs were taken for all three species during various time intervals after inoculation. It was found that oropharyngeal swabs showed higher viral titers than in cloacal swabs applicable to all three avian species. The chickens and quails shed the virus until they died (up to 3 to 6 days after inoculation, respectively) whilst the ducks shed the virus on 2-4 DPI. The postmortem tissues collected from the chickens and quails on day 3 and days 4-5 and from clinically normal ducks that were euthanized on day 4 contained the virus. However, the ducks had significantly lower viral titers than the chickens or quails. Thus, the three avian species varied significantly in their clinical signs, mortality, tissue virus titers, and duration of virus shedding. Our observations suggest that duck and quail farms should be monitored particularly closely for the presence of HPAIV so that further virus transmission to other avian or mammalian hosts can be prevented. 相似文献
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Kosuke SODA Maya YAMANE Chiharu HIDAKA Kozue MIURA Trang T. H. UNG Hang L. K. NGUYEN Hiroshi ITO Mai Q. LE Toshihiro ITO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(12):1899
Low and highly pathogenic avian influenza viruses (LPAIVs and HPAIVs, respectively) have been co-circulating in poultry populations in Asian, Middle Eastern, and African countries. In our avian-flu surveillance in Vietnamese domestic ducks, viral genes of LPAIV and HPAIV have been frequently detected in the same individual. To assess the influence of LPAIV on the pathogenicity of H5 HPAIV in domestic ducks, an experimental co-infection study was performed. One-week-old domestic ducks were inoculated intranasally and orally with phosphate-buffered saline (PBS) (control) or 106 EID50 of LPAIVs (A/duck/Vietnam/LBM678/2014 (H6N6) or A/Muscovy duck/Vietnam/LBM694/2014 (H9N2)). Seven days later, these ducks were inoculated with HPAIV (A/Muscovy duck/Vietnam/LBM808/2015 (H5N6)) in the same manner. The respective survival rates were 100% and 50% in ducks pre-infected with LBM694 or LBM678 strains and both higher than the survival of the control group (25%). The virus titers in oral/cloacal swabs of each LPAIV pre-inoculation group were significantly lower at 3–5 days post-HPAIV inoculation. Notably, almost no virus was detected in swabs from surviving individuals of the LBM678 pre-inoculation group. Antigenic cross-reactivity among the viruses was not observed in the neutralization test. These results suggest that pre-infection with LPAIV attenuates the pathogenicity of HPAIV in domestic ducks, which might be explained by innate and/or cell-mediated immunity induced by the initial infection with LPAIV. 相似文献
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通过使用血清3型鸭甲型肝炎疫苗免疫SPF鸡,制备了一批血清3型鸭甲型肝炎诊断用阳性血清,并对其进行了无菌、支原体和特异性检验以及中和效价测定。结果表明,该血清无菌检验合格,无支原体污染,特异性良好,无禽类常见13种外源病毒抗体,血清中和效价为10-2.8。本研究为鸭甲型肝炎病毒血清学鉴定及相关研究提供了重要的物质基础。 相似文献
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Saito T Watanabe C Takemae N Chaisingh A Uchida Y Buranathai C Suzuki H Okamatsu M Imada T Parchariyanon S Traiwanatam N Yamaguchi S 《Veterinary microbiology》2009,133(1-2):65-74
Highly pathogenic avian influenza (HPAI) viruses of the H5N1 subtype have caused several rounds of outbreaks in Thailand. In this study, we used 3 HPAI viruses isolated in Thailand in January 2004 from chicken, quail, and duck for genetic and pathogenetic studies. Sequence analysis of the entire genomes of these isolates revealed that they were genetically similar to each other. Chickens, quails, domestic ducks, and cross-bred ducks were inoculated with these isolates to evaluate their pathogenicity to different host species. A/chicken/Yamaguchi/7/04 (H5N1), an HPAI virus isolated in Japan, was also used in the chicken and quail studies for comparison. All four isolates were shown to be highly pathogenic to chickens and quails, with 100% mortality by 10(6) EID50 inoculants of the viruses. They caused sudden death in chickens and quails within 2-4 days after inoculation. The mean death times (MDT) of quails infected with the Thai isolates were shorter than those of chickens infected with the same isolates. Mortality against domestic and cross-bred ducks ranged from 50 to 75% by intranasal inoculation with the 10(6) EID50 viruses. Neurological symptoms were observed in most of the inoculated domestic ducks and appeared less severe in the cross-bred ducks. The MDTs of the ducks infected with the Thai isolates were 4.8-6 days post-inoculation. Most of the surviving ducks infected with the Thai isolates had sero-converted until 14 dpi. Our study illustrated the pathobiology of the Thai isolates against different poultry species and would provide useful information for improving control strategies against HPAI. 相似文献
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为探讨番鸭呼肠孤病毒(MDRV)和H9亚型禽流感病毒(H9 AIV)共感染对番鸭法氏囊免疫应答能力的影响,本研究将MDRV或/和H9 AIV人工感染8日龄番鸭,观察法氏囊病理组织学变化,检测法氏囊B细胞增殖能力及RE-5 AIV疫苗免疫后抗体变化规律.结果显示:H9 AIV感染组番鸭发病率低(10％),无死亡,法氏囊无病理变化,显著抑制番鸭法氏囊细胞增殖反应;MDRV感染番鸭发病率70％,死亡率40％,生长迟缓,法氏囊病理变化为萎缩,淋巴细胞减少,局部出现范围较小的坏死灶,番鸭法氏囊细胞增殖反应下降;共感染组番鸭发病率100％,死亡率80％,番鸭生长迟缓,法氏囊萎缩和淋巴细胞增殖反应下降程度均比单一病毒感染组严重.病毒感染使番鸭对RE-5 AIV疫苗免疫应答能力明显下降,其共感染组抑制抗体应答程度最严重;共感染组的病毒检出时间早于并且检出率大于单一病毒感染组.表明MDRV与H9 AIV共感染在番鸭免疫应答抑制方面有协同作用. 相似文献
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H5亚型禽流感疫苗对特禽及水禽的免疫效果观察 总被引：8，自引：0，他引：8
用H5N2亚型禽流感疫苗,分别免疫SPF鸡、乌鸡、珍珠鸡、贵妃鸡、火鸡、鸭及鹅,免疫后采血测定其HI抗体,观察我国现有的H5N2亚型禽流感疫苗对特禽及水禽的免疫效力.结果,免疫后3周,SPF鸡、乌鸡、珍珠鸡、贵妃鸡、火鸡、鸭及鹅的平均HI抗体滴度分别为2 7.2、2 7.6、2 4.3、2 4.83、2 4.6、2 6.2及2 5.3,乌鸡两次免疫,其中一次HI抗体为2 9.65.试验证明,SPF鸡、特禽及水禽用H5N2亚型禽流感疫苗免疫后,均能产生一定水平的HI抗体,但不同种类的家禽所产生的HI抗体滴度存在较大差异,以SPF鸡及乌鸡所产生的HI抗体滴度最高,而珍珠鸡、贵妃鸡及火鸡所产生的HI抗体滴度较低,水禽对H5N2亚型禽流感疫苗可产生一定水平的HI抗体. 相似文献