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1.
从云南新分离森林脑炎病毒(YH和T57)及东北株经脑内、皮下及腹腔感染成年中国云南树鼩,均发生病毒血症。持续时间为7—9天。抗体应答反应和病理改变程度成反比,病变轻的能产生较好的免疫应答。血凝抑制抗体、中和抗体和补体结合抗体分别于感染后的第5、7、13天出现,且血凝抑制抗体和中和抗体的升高呈正相关。经抗原定位研究发现,腹腔注射后48小时,各组织器官均能查到抗原,除中枢神经系统外,其它组织内病毒抗原消失都很快,随病毒血症的消失而转阴,中枢神经系统携带抗原可持续27天,且病变随病程的延长而加重,表现为充血、血管周围淋巴细胞呈套状浸润,局灶性出血,神经元变性,胶质细胞增生,轴索断裂等,说明靶器官是中枢神经系统。试验表明,成年中国云南树勉对森林脑炎病毒比较敏感,是森林脑炎病毒动物模型研究首选动物。  相似文献   

2.
树Ju对森林脑炎病毒的敏感性及发病机理的研究   总被引:2,自引:0,他引:2  
从云南新分离森林脑炎病毒(YH和T570及东北株经脑内、皮下及腹腔感染成年中国云南树Ju,均发生病毒血症,持续时间为7-9天。抗体应答反应和病理改变程度成反比,病变轻的能产生较好的免疫应答。血凝抑制抗体、中和抗体和补体结合抗体分别于感染后的第5、7、13天出现,且血凝抑制抗体和中和抗体的升高呈正相关。经抗原定位研究发现,腹腔注射后48小时,各组织器官均能查到抗原,除中枢神经系统外,其它组织内病毒抗原消失都很快,随病毒血症的消失而转阴,中枢神经系统携带抗原可持续27天,且病变随病程的延长而加重,表面为充血、血管周围淋巴细胞呈套状浸润,局灶性出血,神经元变性,胶质细胞增生,轴索断裂等,说明靶器官是中枢神经系统。试验表明,成年中国云南树Ju对森林脑炎病毒比较敏感,是森林脑炎病毒动物模型研究首选动物。  相似文献   

3.
从云南新分离森林脑炎病毒(YH和T57)及东北株经脑内、皮下及腹腔感染成年中国云南树鼯,均发生病毒血症,持续时间为7-9天。抗体应答反应和病理改变程度成反比,病变轻的能产生较好的免疫应答。血凝抑制抗体、中和抗体和补体结合抗体分别于感染后的第5、7、13天出发,且血凝抑制抗体和中和抗体的升高呈正相关。经抗原定位研究发现,腹腔注射后48小时,各组织器官均能查到抗原,除中枢神经系统外,其它组织内病毒抗原消失都很快,随病毒血症的消失而转阴,中枢神经系统携带抗原可持续27天,且病变随病程的延长而加重,表现为充血、血管周围淋巴细胞呈套状浸润,局灶性出血,神经元变性,胶质细胞增生,轴索断裂等,说明靶器官是中枢神经系统。试验表明,成年中国云南树鼯对森林脑炎病毒比较敏感,是森林脑炎病毒动物模型研究首选动物。  相似文献   

4.
EV71可感染幼龄中缅树鼩   总被引:1,自引:0,他引:1  
Wang WG  Huang XY  Xu J  Sun XM  Dai JJ  Li QH 《动物学研究》2012,33(1):7-13
  相似文献   

5.
目的采用临床分离的茄病镰刀菌感染树鼩角膜,建立茄病镰刀菌性角膜炎树鼩模型。方法茄病镰刀菌接种到沙保氏培养基,26℃培养箱培养7 d,收集真菌混悬液,血细胞计数板调整孢子数量为1×10~(10)CFU/m L。清洁级树鼩40只随机分为实验组(n=30)、对照组(n=10)。实验组用胰岛素针头(29 G)将真菌孢子混悬液50μL注入角膜基中央,对照组注入生理盐水50μL。通过前段照相、共聚焦显微镜检查、病理组织学变化、感染角膜组织培养对模型进行评价。结果真菌浸润范围、角膜上皮细胞和内皮细胞水肿程度、菌丝数量均与时间呈正相关;炎性细胞浸润数量造模后第7天达到高峰,以中性粒细胞为主;实验各时间点均可见菌丝平行于基质纤维生长;感染后角膜组织培养可见茄病镰刀菌生长;造模成功率为86%。结论采用基质注射茄病镰刀菌孢子的方法首次成功建立茄病镰刀菌性角膜炎树鼩模型。  相似文献   

6.
目的探讨树鼩呼肠孤病毒激起机体免疫变化的特征,为树鼩的病毒防范提供理论基础。方法选取40~50日龄的树鼩分为三组(MRV1/TS/2011病毒株、MRV3/TS/2013病毒株和空白对照),通过灌胃后,采集第1、8、14、21、28天尾静脉血样,RT-PCR检测病毒载量、流式细胞术检测CD4/CD8/CD19、ELISA检测IFN-γ。结果感染第14天,MRV1/TS/2011和MRV3/TS/2013组的树鼩病毒载量、CD_4~+及CD19+细胞数量达峰值,其中经MRV1/TS/2011感染后第1天CD_4~+就有较高表达且数值与对照组相比差异有显著性,CD_8~+细胞数量及IFN-γ表达量在感染后第21天达到峰值。CD_4~+经MRV1/TS/2011感染后表达量更高,CD_8~+经MRV3/TS/2013感染后表达量更高。结论初步得出MRV1/TS/2011及MRV3/TS/2013感染机体后,随病毒载量变化,CD4/CD8/CD19及IFN-γ产生的变化规律:MRV1/TS/2011感染前期主要激起机体体液免疫,CD_4~+细胞发挥主要作用;MRV3/TS/2013可能主要影响机体细胞免疫,体液免疫只在病毒表达量显著升高及感染后期发挥作用,CD_8~+细胞和IFN-γ通过细胞免疫参与抗病毒反应。CD_4~+细胞可能对1型呼肠孤病毒更敏感,而CD19细胞+可能对3型呼肠孤病毒更敏感。对树鼩呼肠孤病毒的感染特征研究和树鼩本身的病毒防范有一定指导意义。  相似文献   

7.
本实验将乙脑减毒活疫苗SA_(14)-14-2株以不同疫苗病毒量(3.87PFU/ml和5.87PFU/ml)分别一次免疫豚鼠,观察其对强毒攻击后抑制毒血症和抗体形成的能力。结果显示疫苗(5.87PFU/ml)免疫组豚鼠攻击前虽然中和抗体阴性或很低,但经攻击感染后不同时间内均未出现病毒血症,对照组豚鼠则于第2,3,4天全部出现病毒血症。表明一次活疫苗免疫后能有效地抑制病毒血症的产生。免疫后30天虽然免疫组的豚鼠中和抗体很低,但攻击感染后抗体迅速增长。第四天的抗体滴度为1:8~32,第5天达1:128~256,第14天抗体高达1:512~1024;而对照组抗体则上升很慢,第7天才出现低水平抗体(1:4)。血凝抑制抗体增长的动态与中和抗体近似。表明活疫苗免疫后虽然中和抗体水平不高,但一经感染可迅速产生高滴度抗体达到保护作用。  相似文献   

8.
广州首起输入性基孔肯雅热的调查分析   总被引:3,自引:0,他引:3  
广州网络报告的疑似"登革热"患者经广州市疾病预防控制中心流行病学调查、血清学检测、病原学分离培养等做出的诊断为首例输入性基孔肯雅热。又经中国疾病预防控制中心和广东省疾病预防控制中心对疑似基孔肯雅热患者作进一步基孔肯雅病毒抗体和核酸等检测,并对扩增出的基孔肯雅病毒特异性片段进行了序列测定和分析。核苷酸同源性比较显示,E2区(336nt)和NS1区(314nt)的核苷酸序列与意大利基孔肯雅病毒分离株ITA07-RA1及多株印度的基孔肯雅病毒分离株的序列高度同源(98%以上)。根据现场流行病学和实验流行病学的调查结果,可以确认这例疑似境外感染的输入性登革热实为基孔肯雅热病例,也是中国首例输入性基孔肯雅热病例。  相似文献   

9.
本文探查了树鼩对人单纯疱疹病毒Ⅱ型(HSV-Ⅱ)的敏感性。其结果报道如下: (一)动物感染HSV-Ⅱ后的死亡率:树鼩经HSV—Ⅱ感染后第3天开始死亡,5一7天死亡数达到高峰。腹腔感染组第7天死亡率达80.2%,第14天为100%;阴道感染的动物死亡率为76.8%,见表1。以兔肾细胞悬液经阴道填充和腹腔注射的对照动物无1例死亡。  相似文献   

10.
目的利用重组8型腺相关病毒介导1.3拷贝HBV基因组(1.3HBV,ayw亚型)在树鼩肝脏表达,建立HBV急性感染树鼩模型。方法通过大腿内侧静脉注射将携带有1.3 HBV的重组8型腺相关病毒(recombi-nant adeno-associated virus 8,rAAV8-1.3HBV)导入树鼩肝脏,通过ELISA检测树鼩血清中HBsAg、HBeAg、HBsAb、HBeAb、HBcAb,荧光定量PCR检测树鼩肝脏和血清中HBV DNA,全自动生化分析仪检测血清中ALT水平,并观察感染后肝脏的病变情况。结果 HBV感染主要血清标志物1~2周内均检测阳性;30 d后肝组织仍可检测到病毒抗原阳性细胞;55 d时肝组织HBV DNA拷贝数仍可达到104~105;树鼩血清中HBV DNA拷贝数持续一个月高于正常组;肝组织炎细胞略增多,血清ALT水平持续升高。结论 rAAV8所携带的HBV基因组高效专一导入树鼩肝细胞并复制表达,成功建立HBV急性感染树鼩模型,为进一步探索rAAV8树鼩慢性感染模型打下一定的基础。  相似文献   

11.
从云南省蝙蝠中分离基孔肯雅病毒及血清抗体调查   总被引:19,自引:1,他引:18  
  相似文献   

12.
克隆鸭乙型肝炎病毒DNA双体体内转染的研究   总被引:1,自引:0,他引:1  
用一种含头尾相连DHBVDNA双体的质粒体内转染2日龄芙蓉鸭,大多数鸭(86%)产生了短暂病毒血症。血清DHBs/preSAg和DHBVDNA于转染后第9天出现,第12~14天达峰值,第28天时多数转阴;少数鸭的病毒血症可持续50天以上。转染鸭肝组织中也检测到复制中间型DHBVDNA的存在。用转染鸭病毒血症期的血清作磷钨酸负染电镜观察,找到了完整的DHBV病毒颗粒,并且用此血清腹腔注射1日龄鸭,60%的鸭被感染成功,证明体内转染后有生物活性的DHBV病毒颗粒的产生。该研究方法的建立.对于研究DHBV变异株.DHBV基因结构与功能的关系等,均有一定理论意义及应用价值。  相似文献   

13.
用4株基孔肯雅病毒经口感染白纹伊蚊和埃及伊蚊,进行了易感性和传播性的研究。结果表明,这两种蚊虫对基孔肯雅病毒易感。无论白纹伊蚊或埃及伊蚊,感染后第5-6天即可通过吸血将病毒传播给乳鼠,至第8-13天,传播率可高达55.55%-100%。感染蚊亦可经叮咬将病毒传播给小鸡。埃及伊蚊的易感性和传播率高于白纹伊蚊。实验还发现,不同来源毒株之间存在一定差异,如分离自云南白纹伊蚊的M81株的感染率和传播率均高于其它毒株。这些结果表明,白纹伊蚊和埃及伊蚊在基孔肯雅病毒的保存和传播中起重要作用。  相似文献   

14.
A study was performed to determine if type C influenza infection could be established in dogs as a model for human cases. Mongrel dogs were infected with the Ann Arbor/1/50 strain of type C influenza virus and were examined for clinical symptoms, virus isolation and antibody response. After the first exposure to the virus, all infected animals developed nasal discharge and some of them also showed swelling of the eyelids, and suffusion of the eyes with tears and eye mucus, within 1 to 4 days. The animals showed an increase in hemagglutination-inhibiting (HI) serum antibody, and recovery of the agent from the nasal swabs was successful. The symptoms lasted for as long as 10 days in most infected dogs, which was comparable to our human cases reported previously (Katagiri, S., Ohizumi, A., and Homma, M. 1983. J. Infect. Dis. 48 : 51–56). After the second and third virus exposures at intervals of 50 days, all animals developed the same symptoms as those described above and the rise in antibody titer was evident. The virus could be recovered from four of the six dogs 2 to 5 days after the second exposure and from one dog as late as 10 days after the third exposure. Increases in antibody titer in the IgM fraction were observed after every infection. In control dogs which were mock-infected with UV-inactivated virus, no symptoms were evident and recovery of the virus was not successful although an increase in HI serum antibody titer was seen. These results show that mongrel dogs are sensitive to type C influenza virus and that repeated infections characteristic of human influenza C can be experimentally produced in dogs.  相似文献   

15.
The production of cytotoxic cells in the spleen of adult male BALB/c mice infected with Coxsackievirus B-3 has been examined.An in vitro 51Cr release assay was used to measure cytotoxic activity against virus-infected and uninfected neonatal sygeneic fibroblasts. Cytotoxicity of immune spleen cells against virus-infected targets was detected on the 3rd day after infection, reached a peak on day 7, and then declined to low levels by days 12 and 14. Spleen cells obtained 3 and 5 days after infection also exerted cytotoxicity against uninfected fibroblasts, but by the 7th day there was little or no reactivity against uninfected target cells, although activity against infected fibroblasts was maximal at this time. Reciprocal assays performed by using Coxsackie and vaccinia viruses provided evidence of virus specificity of the cytotoxic reaction. When spleen cells were obtained 7 days after infection, the Coxsackievirus-immune population was not cytotoxic for vaccinia-infected fibroblasts, and the vaccinia-immune population was not cytotoxic for Coxsackievirus-infected targets, although each immune cell preparation caused significant lysis of fibroblasts infected with the homologous virus. Additional studies showed that primary mouse or hyperimmune rabbit anti-Coxsackieviral serum could not block immune spleen cell cytotoxicity or induce complement-mediated lysis of infected targets. The findings indicate that Coxsackievirus infection results in surface membrane alterations, but no evidence was obtained that antiviral antibody could react with the infected cells.  相似文献   

16.
Sprague-Dawley rats were infected with Nippostrongylus brasiliensis larvae, and IgE formation was studied. Before infection, the serum IgE level was less than 0.4 μg/ml. The IgE level began to increase from the 10th day of infection, reached its maximum (50–100 μg/ml) at the 14th day and gradually declined. Reinfection of the rats resulted in an increase of the serum IgE level within 7 days. The IgE antibody response to N. brasiliensis antigens did not parallel the increase of IgE synthesis. In most animals, the antibody became detectable in the serum at the 21st day when the total IgE level already began to decrease. The animals showed a secondary IgE antibody response upon reinfection. Both mesenteric lymph nodes and spleen cell suspensions were examined for the presence of IgE-bearing cells (IgE-B cells) and IgE-forming cells by fluorescent antibody technique. The IgE-bearing lymphocytes became detectable in the mesenteric lymph nodes and spleen at the 8th day of infection. The proportion of the IgE-B cells in nonadherent cell population gradually increased and reached maximum at the 14th day; about 20% of immunoglobulin (Ig)-bearing cells in the mesenteric lymph nodes and 10% of Ig-bearing cells in spleen bore IgE on their surface. Evidence was obtained that these lymphocytes synthesized IgE. The IgE-forming cells were detected in both mesenteric lymph nodes and spleen of the infected animals. The number of IgE-forming cells was greater in the mesenteric lymph nodes than in spleen, indicating that the regional lymph nodes are the major source of serum IgE in the N. brasiliensis-infected animals.  相似文献   

17.
Four-week-old rats (WKA/Hkm strain) were infected intranasally with the Ann Arbor/1/50 strain of influenza C virus and examined for clinical symptoms, virus replication, and serum antibody response. Although the animals showed no definite signs of illness, the virus replicated in the nose, and the hemagglutination-inhibiting (HI) and neutralizing antibodies were produced in their sera. When the inoculum sizes of 106.2 and 103.2 PFU were used, virus was recovered from nasal homogenates between days 1 and 10, and serum HI antibody became detectable by 10 days after infection. The rats infected with 101.2 PFU of the virus continued to shed virus until as late as day 20 without producing serum HI antibody. The amount of virus recovered from the nose was not affected significantly by either sex. age, or strain of the rat except that a slower virus growth was seen in the LE strain. It was also observed that the rats, previously inoculated with 103.2 PFU of the virus, showed no virus shedding when reinfected 7 weeks later but produced virus though in low titers when reinfected 50 to 55 weeks later. Virus was also recovered from rats once inoculated with 101.2 PFU of the virus when challenged 7 weeks later. Thus repeated infections characteristic of human influenza C can be produced in rats under the restricted conditions.  相似文献   

18.
Amino acid requirements for the growth of Aedes albopictus, clone C6/36, cells and for the production of dengue (DEN) and Chikungunya (CHIK) viruses were examined by growing the cells or the viruses in media which were deprived of one of the 20 amino acids. Cell growth was markedly inhibited when cystine was omitted from the medium, and to a lesser extent by arginine deprivation. On the other hand, omission of alanine, asparagine, aspartic acid, and glutamic acid at the same time did not affect cell growth. Marked accumulation of alanine was observed in the medium when the cells were grown for 8 days in complete medium, with concomitant depletion of aspartic acid and glutamic acid. The production of CHIK virus was inhibited markedly by omission of cystine from the medium after virus infection, while the production of DEN viruses was more affected by glycine deprivation, although cystine deprivation also inhibited virus production to a lesser extent. On the other hand, production of CHIK and DEN viruses was not affected when alanine, asparagine, aspartic acid, and glutamic acid were omitted from the medium at the same time.  相似文献   

19.
使用重组霍乱毒素B亚基(CTB)与恶性疟原虫抗原表位融合蛋白(AWTE)免疫恒河猴,研究其免疫应答并观察对食蟹疟原虫攻击的保护作用。结果表明:在0,14,28天分别通过鼻腔和肌肉注射免疫恒河猴,第3次免疫后2周,抗CTB抗体平均滴度可达1∶512(鼻腔免疫)和1∶10000(肌肉免疫);肌肉免疫后抗疟原虫抗体滴度也显著高于鼻腔免疫组。用125×108个食蟹疟子孢子攻击,对照组5只恒河猴在攻击后10~14d全部感染,其中1只在攻击后21d死亡,另4只重度感染,感染持续30d以上。鼻腔免疫组的5只动物均在攻击20d后出现原虫,其中3只轻度感染,感染持续4d后即恢复,其余2只感染持续36d以上。肌肉注射组3只未受感染,其余2只在攻击后19d后轻度感染,感染4d后即完全恢复。以上结果表明,使用霍乱毒素B亚基为载体蛋白构建的重组疟疾疫苗具有良好的免疫原性,对食蟹疟攻击具有良好的交叉免疫保护作用。  相似文献   

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