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为了解2017-2018年鹦鹉喙羽病在福建省某些地区鹦鹉中的流行情况,收集了福建省部分地区298份鹦鹉粪便样品,采用PCR方法进行粪便样品检测,对其中鹦鹉喙羽病病毒检测呈阳性的5个地区的样品进行衣壳蛋白(Cap)基因测序后比较其同源性,绘制系统进化树,分析氨基酸序列,并通过生物信息学及序列分析软件预测Cap蛋白二级结构...  相似文献   

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鹦鹉喙羽病(PBFD)是鹦鹉目前最常见的疾病,对鹦鹉养殖业危害极其严重。根据鹦鹉喙羽病毒(PBFDV)基因片段的克隆和序列分析,设计合成1对特异性引物,以CP基因为模板,经PCR扩增获得830 bp的核苷酸DNA,并用DIG标记DNA,制备用于检测PBFDV的特异性核酸探针。用该核酸探针对疑似感染PBFDV的鹦鹉病料进行斑点杂交检测,并对鉴定为阳性的PBFDV进行全基因组扩增和测序分析。结果显示,利用PCR结合斑点杂交技术检测PBFDV,特异性强、敏感度高,具有可重复性。鉴定为阳性的2株PBFDV全基因组序列之间同源性为100%,与已报道序列的同源性为81.5%~98.9%。本研究为我国开展PBFDV感染的分子流行病学调查和临床诊断提供了一种敏感、特异的检测方法。  相似文献   

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Emerging diseases are acknowledged as a growing threat to wildlife, with the continued identification of pathogenic and potentially pathogenic viruses in avian species resulting from ongoing advances in molecular diagnostic techniques. Parvoviruses under the genus Chaphamaparvovirus (subfamily Hamaparvovirinae) are highly divergent. The detection and characterisation of parvoviruses in psittacine birds is limited. This study reports a novel parvovirus, tentatively named psittaciform chaphamaparvovirus 3 (PsChV-3) under the genus Chaphamaparvovirus, identified in an Australian free-ranging little corella (Cacatua sanguinea). The PsChV-3 genome is 4277 bp in length and encompasses four predicted open-reading frames, including two major genes, a nonstructural replicase gene (NS1), and a structural capsid gene (VP1). The NS1 and VP1 genes showed the closest amino acid identities of 78.8% and 69.7%, respectively, with a recently sequenced psittaciform chaphamaparvovirus 2 from Australian Neophema species grass parrots. In addition, the presence of two complete novel beak and feather disease (BFDV) genomes, 1993 and 1868 nt in length, respectively, were detected from the same bird. Both these BFDV genomes contained two bidirectional ORFs encoding the putative Rep and Cap proteins. Phylogenetic analysis showed that the sequenced novel BFDV genomes clustered in a distinct subclade with other BFDVs isolated from Australian cockatoos. This study contributes to the characterisation chaphamaparvoviruses and BFDV in Australian parrots and supports the need for ongoing monitoring and molecular studies into the avian virome in native Australian psittacine bird species.  相似文献   

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Elevation of the abomasal pH of ruminants is a well known consequence of nematode parasitism. Many have argued that the nematodes seek to increase pH to promote their survival. Indeed, there is limited evidence that substances released by the parasites are capable of directly influencing parietal cell activity. In one experimental series, excretions/secretions (ES) of Teladorsagia circumcincta reduced the apparent activity of rabbit gastric glands. Worm ES were shown to contain ammonia, probably accounting for the observed activity, and the effects of ES/ammonia are almost certainly an in-vitro phenomenon only. An alternative hypothesis contends that the loss of acid secretion arises as a consequence of the profound host response elicited by the presence of the parasites. Invariably, presence of parasites is accompanied by an inflammatory response in which eosinophils are conspicuous. Recent research has shown that exudates from inflamed tissues were also inhibitory to gastric gland activity and that during infection, expression of the pro-inflammatory cytokine interleukin 1-beta, the most potent known inhibitor of acid secretion by parietal cells, was increased. Further, the elevation of abomasal pH may prove to have adverse effects on the ability of the parasites to maintain their position within the abomasum.  相似文献   

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2008年7月末,我国青岛即墨地区患病的虎皮鹦鹉幼雏出现体重下降、脱羽和羽毛变形萎缩、鸟喙变形及胸腺结构变异等症状,怀疑为鹦鹉喙羽病(PBFD)。利用PCR对濒死鹦鹉进行鹦鹉喙羽病病毒(PBFDV)的检测,并对扩增的C1基因进行了测序与分析。结果表明,有两只检测为PBFDV阳性,B last分析发现,QD-CN08株与GenBank中已发表的PBFDV分离株C1基因同源性为82%~93%,进化树分析表明与日本的毒株有比较近的亲缘关系。结合临床症状、流行病学特征和实验室诊断,确诊为鹦鹉喙羽病,此病为中国大陆首次报道。  相似文献   

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Birds are known to harbour many pathogens, including circovirus, herpesviruses, adenoviruses and Chlamydia psittaci. Some of these pose zoonotic risks, while others, such as beak and feather disease virus (BFDV), have a significant impact on the conservation of endangered bird species.  相似文献   

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为了解广西柳州地区猪主要病毒性传染病的流行情况及变化规律,本试验应用实时荧光RT PCR及实时荧光PCR对2020~2023年柳州市部分地区屠宰场、散养猪场和规模猪场的组织、抗凝血、棉拭子进行猪繁殖与呼吸综合征病毒(PRRSV 和Nsp2 1559 1680变异株)、猪瘟病毒(CSFV)、猪圆环病毒2型和3型(PCV2 3)和猪塞内卡A 型病病毒(SVA)4种疫病病原检测。检测结果显示:(1)HPRRSV Nsp2 1559 1680变异株、PRRSV、CSFV、PCV2、PCV3、SVA 的病原平均阳性率分别为0.00%(0/191)、8.04%(191/2 377)、0.08%(2/2 377)、45.23%(992/2 193)、32.74%(718/2 193)、0.16%(2/1 239);(2)PRRSV、PCV2、PCV3感染率较高,CSFV 和SVA 为零星感染,其中PCV2的感染率呈逐年下降趋势,PRRSV 和PCV3的感染率波动较大,2020~2022年呈逐年下降趋势,2023年较2022年的感染率呈上升趋势;(3)PCV2和PCV3在不同年份度中健康猪样品病原阳性率均高于病死猪样品病原阳性率,而PRRSV 在不同年份度中健康猪样品病原阳性率均低于病死猪样品病原阳性率;二重感染以PCV2混合其他病毒感染为主,其中PCV2和PCV3感染较为严重,平均感染率为15.18%;(4)三重感染以PRRSV、PCV2、PCV3混合感染较为严重,平均感染率为2.74%。结果表明:PRRSV、PCV2、PCV3是目前对广西柳州市猪群危害较为严重的主要病毒性疫病,且混合感染较为普遍,应进一步加强流行病学监测,并制定科学合理的免疫程序和计划强化各场点的生物安全防控措施,减少病原的污染、传播与流行,促进广西柳州市生猪行业的健康稳定发展。  相似文献   

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猪圆环病毒病是由猪圆环病毒感染后引起的一种免疫抑制性传染病.不同阶段的猪感染后可能表现不同的临床症状,而且容易发生连续感染,增加治疗难度,给猪场造成巨大损失.文章从猪圆环病毒病的病原、流行病学、临床症状与病理变化、诊断方法和防控措施进行了概述,以期为广大养猪生产者提供借鉴.  相似文献   

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九孔鲍鱼病毒病的防治试验   总被引:1,自引:3,他引:1  
在福建东山个发病的鲍鱼养殖场进行了对比试验。该种病毒病可通过隔离,使用沙滤水,用鲍毒清药浴或将药拌入产而得到治疗并控制其蔓延。对照池的鲍鱼未采取防治措施短时间内全部死亡。  相似文献   

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牛病毒性腹泻的流行情况及防制   总被引:1,自引:0,他引:1  
牛病毒性腹泻是由牛病毒性腹泻病毒引起的一种急性热性传染病。除了引起牛发病外,还可引起猪、羊、鹿及多种野生动物感染,给畜牧业造成严重的经济损失。作者对牛病毒性腹泻的流行情况进行了总结,并提出了相应的防制措施。   相似文献   

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Extract

Paradontal disease is a general name applied to disease processes involving the tissues which surround teeth. Anatomically, these tissues (see Fig. 1) ; comprise the gum margin, the gingival crevice or sulcus, and the epithelial attachment and subgingival epithelium. Diseases of these tissues are .termed marginal gingivitis. Next is the bony alveolus lined by the periodontal membrane which serves both as periostium to the alveolus and cement layer of the tooth, and, by virtue of fibrous bands, as an anchor for the tooth in the alveolus. Disease processes in this membrane are termed periodontitis or paradenitis. When the alveolar hone is involved, the appropriate name, is given—e.g., alveolar ostitis, which is commonly, rarefying (alveolar atrophy), or osteomyelitis. For all practical purposes, these paradontal tissues may be considered as a single unit, as a disease process originating in any one of these tissues invariably involves the others, either, simultaneously or consecutively, resulting in general involvement of all the paradontal tissues in the condition often called alveolar pyorrhoea.  相似文献   

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目前乃至今后威胁猪健康的最危险的潜在因素之一,就是免疫抑制引起免疫失败及对病原的易感性增加。作者主要阐述与讨论了2种目前常见的猪病毒性免疫抑制病的概念、免疫抑制机理及防制,以此引起同行对该病的进一步重视。  相似文献   

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在福建省东山县和漳浦县的2个鲍鱼养殖场进行鲍鱼球状病毒病防治试验。该病可以通过隔离,使用砂滤水消毒,用鲍毒清药浴,投喂药物饵料综合防治措施进行预防。未采取防治措施的对照组则在短期内全部死亡。  相似文献   

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鸡痘是一种由鸡痘病毒引起的急性,高度接触性的传染性疾病。临床上常见的类型有皮肤型、黏膜型和混合型。皮肤型临床表现特征多以皮肤(由以头部皮肤、鸡冠、肉髯及翅下无毛或少毛区)的痘疹,继而结痂、脱落;黏膜型多以口腔和咽喉黏膜的纤维素性坏死性炎症为特征,形成假膜。感染鸡痘病毒的鸡群死亡率并不是很高,但可引起病鸡生长发育缓慢,产蛋量下降,孵化率降低等,并可继发其他传染病。在饲养卫生条件不达标、营养不良的情况下,可使病情加剧,严重者可引发大批死亡。免疫接种是防控本病的主要措施,但近年来该病仍有大规模暴发,经过分析诸多临床病例,发现饲养环境差是该病频发的原因之一。因此,必须加强饲养管理,定期进行环境消毒,保持良好的通风,提升机体抵抗力,从而提高鸡痘的防控效果。  相似文献   

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欧美牛病毒性腹泻防控措施及对我国的启示   总被引:1,自引:0,他引:1  
牛病毒性腹泻是牛的重要疫病,导致产奶量下降、肉产量降低、繁殖障碍、生长迟缓、继发其他病原几率增加甚至死亡等,给养牛业造成较大的经济损失。欧美国家在牛病毒性腹泻防控方面形成了一套行之有效的方法,有效地控制并逐步根除了BVD。借鉴欧美牛病毒性腹泻防控策略可对我国该病的防制提供一定的指导。  相似文献   

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2020年4月,山东省威海市某猪场发生一起以哺乳仔猪精神不振、体温升高以及头部、颈部、背部、四肢出现多处皮肤化脓性坏死结痂为基本特征的疾病,发病率为32.43%,病死率为16.67%。为确诊病原,探究病因,采集病猪血液与患处脓液进行生化试验、药敏试验和胶体金试纸检测。结果显示:胶体金试纸检测为猪圆环病毒阳性,生化试验结果符合葡萄球菌特性,结合临床症状与剖检病变,确诊为猪圆环病毒病继发葡萄球菌感染。根据药敏试验结果,选用高敏感的头孢噻呋钠对病猪进行注射治疗,并在产房内外喷洒消毒液,同时全猪群紧急免疫接种猪圆环病毒Ⅱ型灭活疫苗,由此疫情得到有效控制。这提示,规模化猪场既要重视免疫抑制性疫病的控制,也要加强猪场环境卫生与猪群饲养管理。本研究可为猪圆环病毒病并继发细菌感染的诊断与治疗提供参考。  相似文献   

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