共查询到20条相似文献，搜索用时 187 毫秒
1.
鹅副粘病毒的组织嗜性 总被引：2，自引：0，他引：2
用单克隆抗体介导的免疫过氧化物酶（MC－IP）技术，对21只鹅副粘病毒病鹅体内的病毒抗原进行定位，结合组织病理学观察结果，探讨了鹅副粘病毒的组织嗜性。结果显示，除脑和心脏未检测到病毒外，在气管、肺、食道、肝脏、腺胃、胰腺、肠、哈氏腺、胸腺、脾脏、法氏囊、肾脏等器官都能检测到病毒，病毒抗原定位于上述器官的各种上皮细胞，淋巴细胞、网状细胞和巨噬细胞的胞浆内，其中以胃肠粘膜上皮细胞和法氏囊、胸腺、脾脏的淋巴细胞和网状细胞内检出率高，阳性反应强。这些结果提示，鹅副粘病毒是一种泛嗜性病毒，胃肠粘膜上皮和淋巴组织是其主要侵嗜部位。 相似文献
2.
通过对鸭静脉接种或眼-鼻-口腔-泄殖腔接种禽流感病毒A/duck/Guangdong/220/2004(H5N1)后,采用免疫组织化学方法检查病毒核蛋白抗原,探讨了该病毒在组织器官中的定位与分布.结果表明,病毒核蛋白抗原主要存在于鸭的心肌细胞、肝细胞、枯否氏细胞、胰腺泡上皮细胞、肾小管上皮细胞、血管内皮细胞和血液吞噬性自细胞;在气管和支气管黏膜上皮,脑组织,肠黏膜上皮,胸腺、法氏囊、脾脏和肺脏的巨噬细胞或组织细胞以及坏死的细胞碎片中也可检查到少量病毒核蛋白抗原;而在食管、胃、睾丸、卵巢、甲状腺、肾上腺、哈德氏腺、骨骼肌等未检查到该抗原. 相似文献
3.
《国外畜牧学(猪与禽)》2015,(10)
<正>猪圆环病毒病(Porcine Circovirus Diseases,PCVD)或称猪圆环病毒相关性疾病(PCVAD)是主要由猪圆环病毒2型(PCV2)引起的免疫抑制性疾病,临床表现为仔猪先天性震颤(CT)、断奶仔猪多系统衰竭综合征(PMWS)、猪皮炎肾病综合征(PDNS)、猪呼吸道病综合征(PRDC)、母猪繁殖障碍(RF)等[1]。猪圆环病毒2型(PCV-2)主要在机体的单核细胞、巨噬细胞等抗原递呈细胞中生长和复制。引起这类抗原递呈细胞的抗原递呈能力下降,导致机体的免疫机能受到抑制。使得畜体免疫功能受到损害,造成其他细菌或者病毒的并发和继发感染[2]。最近几年我国养猪业面 相似文献
4.
用云南绵羊舌病病毒（ＢＴＶ）人工摘种绵羊３０只，接毒后１～１５天，每天剖检２只，同时剖检健康对照羊２只，用免疫荧光和细胞化学技术对靶器官和免疫器官进行连续观察，在接毒后６～８天，绵羊血片中发现了荧光阳性反应红细胞，接毒后２天，口角毛囊上皮，７天，颊、鼻粘膜上皮棘细胞层棘细胞胞浆观察到病毒抗原，且接近糜烂溃疡灶含病毒抗原的棘细胞和游走进来吞噬抗原的巨噬细胞越多。在免疫器官从接毒后５～６天起就可见嗜酸 相似文献
5.
用云南绵羊益舌病病毒（ＢＴＶ）人工摘种绵羊３０只，接毒后１～１５天．每天剖检２只，同时剖检健康对照羊２只，用免疫荧光和细胞化学技术对靶器官和免疫器官进行连续观察．在接毒后６～８天．绵羊血片中发现了荧光阳性反应红细胞．接毒后２天，口角毛囊上皮，７天，颊、鼻粘膜上皮棘细胞层棘细胞胞浆观察到病毒抗原，且越接近糜烂溃疡灶含病毒抗原的棘细胞和游走进来蚕噬抗原的巨噬细胞越多．在免疫器官从接毒后５～６天起就可见嗜酸性粒细胞增生，巨噬细胞胞浆有病毒抗原．且在嗜酸性粒细胞周围观察到荧光强度不一、均质、多形态的抗原－抗体复合物附着．免疫器官中免疫活性细胞在接毒后６～９天受损较重，Ｔ细胞数减少．Ｂ细胞中成熟型和衰竭型浆细胞大量增加．有分泌抗体能力的未成熟型浆细胞不能形成增殖高峰，１２天后，Ｔ、Ｂ细胞增殖均形成高峰．本文就上述观察结果与动物发病、耐过等临床表现的相关性进行了讨论． 相似文献
6.
7.
为研究鹅新城疫（ND）的发病机理,用3株鹅新城疫病毒强毒株分别人工感染25日龄雏鸡,以单克隆抗体介导的免疫组化（IHC）法检测攻毒鸡体内NDV抗原的分布及定位,研究了鹅新城疫病毒（NDV）对鸡的组织嗜性。结果显示。在试验鸡多种组织器官中均能检测到NDV抗原,病毒抗原主要定位于淋巴细胞、网状细胞、巨噬细胞、肝细胞及各种上皮细胞的胞浆内。结果表明,鹅NDV强毒株对鸡是一种泛嗜性病毒。 相似文献
8.
用免疫荧光技术对接种马传贫弱毒的14匹马和20头驴体内病毒抗原进行了8－9个月的连续跟踪观察，结果表明，病毒抗原主要出现在肝淋、脾淋、脾淋、蛋白髓等免疫器官，其形态主要有三大类，第一类存在于巨噬细胞胞浆内；第二类是以免疫复合物形式附贴在增生的嗜酸性粒细胞及其崩解的颗粒上，第三类的为泡沫样无定型荧光，主要存在于肾细胞管管腔中，本文就弱毒抗原在体内持续存在的机理，弱毒抗原与免疫形态学及机体免疫状态关系，神经内分泌调节在免疫发生中的作用以及马与驴免疫形态差异产生的原因等进行了讨论。 相似文献
9.
1.1感染率高PCV(圆环病毒)对猪具有较强的易感性。可经口腔、呼吸道感染不同年龄的猪,部分怀孕母猪感染PCV2后,经胎盘垂直传播给仔猪。用PCV2人工感染后,其他未接种猪同居感染率达100%。可经鼻液、粪便等废物中排出病毒。PCV2常与细小病毒和PRRS混合感染。1.2PCV2感染的猪具有免疫抑制特性如淋巴细胞缺失,B细胞和T细胞的数量下降,淋巴器官中的T、B淋巴细胞数量减少。淋巴组织巨噬细胞浸润,外周血和淋巴组织中的巨噬细胞、单核细胞数量升高,因此PCV2感染的猪群免疫功能下降,使猪群对其他病体的抵抗力大大降低。研究发现,PCV2感染… 相似文献
10.
不同基因型新城疫病毒强毒株对鸡的致病性 总被引：3，自引：1，他引：3
就不同基因型新城疫病毒强毒株对鸡的致病性进行了比较。用3种基因型（Ⅵg、Ⅶd亚型、Ⅸ型）新城疫病毒强毒株分别人工感染25日龄雏鸡，结果各株病毒接种鸡均100％发病、100％死亡，表现出嗜内脏型新城疫病毒感染引起的典型的新城疫症状和病理变化。免疫组化检测发现．攻毒鸡多种组织器官中能检测到病毒抗原，在能检测到病毒抗原的器官中，病毒抗原主要定位于淋巴细胞、网状细胞、巨噬细胞、肝细胞及各种上皮细胞的胞浆内；新城疫病毒对肠相关淋巴组织的亲嗜性优先于附近的上皮。本试验结果表明．基因Ⅵg、Ⅶd亚型、Ⅸ型新城疫病毒强毒株对鸡均具有高度致病性。 相似文献
11.
猪繁殖与呼吸综合征病毒缺失变异株的基因组特征 总被引：51，自引：1，他引：51
对猪繁殖与呼吸综合征病毒(PRRSV)分离株HB2(sh)／2002的全基因组序列进行了测定与分析。该毒株基因组全长为15373nt(不包括PolyA尾)，与国内外美洲型PRRSV分离株全序列相似性介于88．7％～95．1％之间。序列分析表明，该毒株是1个天然存在缺失的变异毒株，其ORFla的Nsp2存在编码12个氨基酸的连续36个核苷酸的缺失，ORF、3存在编码1个氨基酸的3个核苷酸的缺失。这是国内外首次发现PRRSV存在缺失变异现象，研究结果补充和丰富了PRRSV毒株的基因组信息数据，为深入研究该毒株的遗传与变异及其与生物学特性的关系奠定了基础。 相似文献
12.
猪繁殖与呼吸综合征病毒的分离与鉴定 总被引：9，自引：0，他引：9
从广东地区发病猪场的病料中,分离到1株致Marc-145细胞病变的病毒ShB6。扩增猪繁殖与呼吸综合征病毒(PRRSV)主要结构蛋白基因ORF2-ORF7并进行序列分析,结果表明,该分离株与国内PRRSV分离株HB-1(sh)/2002的同源性为96.9%;与ATCC VR-2332株的同源性为91%;而与Lelystad株的同源性仅为59.8%;用美洲型PRRSV单抗进行免疫组化染色,结果显示在细胞病变处呈现明显的阳性着色(为棕黄色)。综合可见,所分离的病毒为美洲型PRRSV。 相似文献
13.
为了探究广东省猪繁殖与呼吸综合征病毒(PRRSV)的流行情况,分析所分离毒株的分子遗传进化特征,本研究用RT-PCR方法对广东11个地区66个养殖场的189份病料进行了PRRSV的检测,结果表明,样本的PRRSV总阳性率为48.7%(92/189),其中变异株占63.0%(58/92);阳性病例样本经处理后接种Marc-145细胞,成功分离到9株PRRSV。对分离到的9个毒株进行ORF3、ORF5基因和Nsp2主要变异区基因的扩增、克隆、测序和遗传变异分析。序列分析结果发现,其中2株Nsp2基因没有缺失,7株病毒的Nsp2基因发生了与高致病性PRRSV毒株相同的缺失,即第481位有一个氨基酸缺失,第532-560位有连续29个氨基酸缺失。同源性分析表明,分离毒株GDYF、GDZC、GDEP、GDSD、GDSH2、GDTH1、GDTH2与国内的HB-1(sh)/2002毒株及其它高致病性PRRSV同源性较高;GDX071108和GDSH1则与VR2332、RespPRRSVMLV、CH-1a的同源性较高,分离株之间的同源性为60.3%-100.0%。系统进化分析发现,GDX071108与PA8和RespPRRSVMLV的亲缘关系很近,与VR2332亲缘关系较近;而GDYF、GDZC、GDEP、GDSD、GDSH2、GDTH1、GDTH2则与JXA1、GD、HUB1、HUB2、HN2、HUN1、HNyz、HEB1、HUN4都在HB-1(sh)/2002的同一分支上。 相似文献
14.
Genetic variation analysis of porcine reproductive and respiratory syndrome virus isolated in China from 2002 to 2007 based on ORF5 总被引：5，自引：0，他引：5
Yufeng Li Xinglong Wang Ping Jiang Xiaofeng Wang Wen Chen Xianwei Wang Kewei Wang 《Veterinary microbiology》2009,138(1-2):150-155
The complete open reading frame 5 (ORF5) sequences of 34 field porcine reproductive and respiratory syndrome virus (PRRSV) isolates from China in 2002–2007 were detected and compared with the different variable Chinese isolates S1, CH-1a, HB-1, HB-2 and JXA1. The results showed that all isolates were of type 2 PRRSV and could be assigned to two clusters. The isolates in cluster sg1 was high similar with the highly pathogenic PRRSV strain JXA1, while sg2 clustered with type 2 PRRSV isolate VR2332. It was interesting that the isolate SH02 which was isolated from Shanghai in 2002 has 98.8% identity with JXA1 emerged in 2006. And the ZJJ07 isolate was found to be a natural recombinant between a Chinese highly pathogenic SY0608 isolate and a VR-2332 derivative NH04 isolate. Analysis of the potential glycosylation sites indicated that they were frequently mutated and formed five putative N-linked glycosylation (NGS) sites patterns based on N30, 33–35, 44 and 51 in those isolates. It indicated that the highly variable PRRSV strain with different NGS patterns spread widely in China. The great genetic diversity could be taken into consideration for the control and prevention of this disease. 相似文献
15.
16.
Nielsen J Bøtner A Tingstedt JE Aasted B Johnsen CK Riber U Lind P 《Veterinary immunology and immunopathology》2003,93(3-4):135-151
It is well known that piglets congenitally infected with porcine reproductive and respiratory syndrome virus (PRRSV) can be viremic at birth, and that preweaning mortality due to secondary infections often increases during acute outbreaks of PRRS. Therefore, an immunosuppressive effect of in utero infection has been suggested. The aim of the present study was to characterise the changes of leukocyte populations in piglets surviving in utero infection with PRRSV. A total of 27 liveborn uninfected control piglets and 22 piglets infected transplacentally with a Danish strain of PRRSV were included. At 2 and 4 weeks of age, 21 of 22 (96%) and 7 of 14 (50%) examined infected piglets were still viremic, whereas PRRSV could not be detected in the six infected piglets examined at 6 weeks of age. Flow cytometry analysis was used to determine the phenotypic composition of leukocytes in peripheral blood and bronchoalveolar lavage fluid (BALF) of 2-, 4- and 6-week-old infected piglets and age-matched uninfected controls. The key observation in the present study is that high levels of CD8(+) cells constitute a dominant feature in peripheral blood and BALF of piglets surviving in utero infection with PRRSV. In BALF, the average high level of CD8(+) cells in 2-week-old infected piglets (33.4 +/- 12.6%) was followed by a decline to 7.3 +/- 3.0 and 11.1 +/- 3.0% at 4 and 6 weeks of age. BALF of control piglets contained 1.6 +/- 0.9, 2.3 +/- 1.8 and 1.9 +/- 0.5% CD8(+) cells, only. In peripheral blood, however, the average number of CD8(+) cells remained at high levels in the infected piglets throughout the post-natal experimental period (2.8 +/- 1.9, 2.9 +/- 1.8 and 3.2 +/- 1.7 x 10(6) CD8(+) cells/ml at 2, 4 and 6 weeks, respectively). In the controls, the average levels of CD8(+) cells were 0.9+/-0.2, 1.9 +/- 1.7 and 1.6 +/- 0.5 x 10(6)/ml, respectively. Furthermore, the numbers of CD2(+) , CD4(+)CD8(+) and SLA-classII(+) cells, respectively, in peripheral blood, together with the levels of CD2(+) and CD3(+) cells in BALF were increased in the infected piglets infected in utero compared to the uninfected controls.The kinetic analyses carried out in the present study reflect that in utero infection with PRRSV modulates immune cell populations in peripheral blood and BALF of surviving piglets. The observed changes are characterised by high levels of CD8(+) cells supporting an important role of these cells in PRRSV infection. The present results, however, do not support the existence of post-natal immunosuppression following in utero infection with PRRSV. 相似文献
17.
猪繁殖与呼吸综合征病毒核酸在仔猪呼吸及繁殖系统动态分布的研究 总被引：11，自引：0，他引：11
应用针对 PRRSV ATCC VR- 2 332株基因组 ORF6片段的 4 6 3bp的 c DNA探针 ,对 4 5日龄 SPF仔猪分别人工感染 ATCC VR- 2 332株及北京分离株 B96 - 4后不同时间呼吸系统及繁殖系统组织中病毒核酸的分布进行了研究。结果显示 ,在感染后 30 h,即可在鼻黏膜、气管、肺脏、睾丸、附睾、精囊、前列腺、子宫、扁桃体等组织中检出阳性杂交信号 ,且一直持续到感染后 2 8天。其中扁桃体中病毒的数目远多于呼吸系统及繁殖系统组织中的数目 ,说明扁桃体可作为活体检查的目的器官之一 相似文献
18.
Porcine reproductive and respiratory syndrome virus (PRRSV) and porcine circovirus type 2 (PCV2) are pathogens, which can significantly affect the swine industry worldwide. Field surveys suggest that simultaneous PRRSV and PCV2 infection is common in pigs. The objective of this study was to measure the changes in peripheral blood leukocyte subpopulations in piglets co-infected experimentally with PRRSV and PCV2, in order to analyze the synergistic influence of co-infection on the immune system. Changes in peripheral blood leukocyte subpopulations were systematically measured by flow cytometry (FCM). The levels of antibodies to PRRSV and PCV2 were detected by indirect Enzyme-Linked ImmunoSorbent Assay (ELISA) and the indirect fluorescent antibody test (IFA), respectively. Serum viral loads were measured using real-time PCR. The results showed that piglets co-infected with PRRSV and PCV2 exhibited slower generation and lower levels of antibodies to PRRSV and PCV2, and increased amounts and a prolonged presence of both PRRSV and PCV2 in serum, in comparison to the piglets infected with either virus alone. The major finding in our study was that the total and differential leukocyte counts, including white blood cells (WBCs), monocytes, granulocytes and lymphocytes (T, B and NK cells, as well as T-cell subpopulations), dramatically decreased early during co-infection with PRRSV and PCV2 for about two weeks, in contrast with animals singly infected with either PRRSV or PCV2. These results suggest that PRRSV and PCV2 co-infection results in a synergistic decrease in immune cells in the peripheral blood of piglets. These data contribute to the understanding of the immunosuppressive effects resulting from PRRSV and PCV2 co-infection in pigs. 相似文献
19.
上海地区出现猪繁殖与呼吸综合征和2型猪圆环病毒混合感染 总被引：21，自引：2，他引：19
上海地区6个规模化猪场断奶后仔猪出现全身消耗性综合征，剖检的18头病仔猪都表现肺脏严重病变和淋巴结肿大出血。分别设计针对猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus，PRRSV)N蛋白和2型猪圆环病毒(porcine circovirus type2，PCV-2)部分基因的特异性PCR引物，通过RT—PCR和PCR技术从患病猪肺脏组织均扩增出PRRSV和PCV-2的特异基因片段。结合临床症状和流行病学调查，证实上海地区出现PRRSV和PCV-2的混合感染。 相似文献
20.