共查询到20条相似文献，搜索用时 300 毫秒
1.
《中国家禽》2015,(6)
鼻气管鸟疫杆菌(Ornithobacterium rhinotracheale,ORT)是一种多形性、无芽孢、低致病力的革兰氏阴性杆菌,临床上主要引起肉鸡、火鸡、肉鸭和蛋鸡呼吸系统疾病,常常与其它呼吸道病原(禽流感病毒、新城疫病毒、禽偏肺病毒、鸡毒支原体、鹦鹉热衣原体和大肠杆菌)呈现混合感染,导致临床误诊和治疗失败。临床上,ORT发病率最高可达80%,单独感染后的死亡率较低,混合感染后死亡率在30%~87.5%。ORT分成18个血清型,鸡源分离株主要以A型为主,火鸡分离株主要以A、B和D型为主。本文分别对ORT病原学、流行病学、鉴别诊断、临床诊断和防治技术进行综述,阐述从1994~2014年的ORT相关研究进展,为防治ORT的发生和流行提供基础。 相似文献
2.
云南省土杂鸡呼吸系统疫病病因分析 总被引：1，自引：0，他引：1
为了分析云南省土杂鸡呼吸系统疫病病因,分别在云南省楚雄、安宁和石林等地采集出现呼吸系统疫病土杂鸡的喉气管、肺脏、脾脏等组织样品57份,采用RT-PCR或PCR方法对采集的样品进行新城疫病毒、禽流感病毒、鸡传染性支气管炎病毒、鸡传染性喉气管炎病毒、鼻气管鸟杆菌、副鸡嗜血杆菌和支原体等传染性疫病病原核酸检测。结果表明:有3份样品检测显示新城疫病毒核酸呈阳性,阳性率为5.26%;4份样品检测显示禽流感病毒核酸呈阳性,阳性率为7.02%;1份样品检测显示鸡传染性支气管炎病毒核酸呈阳性,阳性率为1.75%;11份样品检测显示鸡传染性喉气管炎病毒核酸呈阳性,阳性率为19.30%;19份样品检测显示鼻气管鸟杆菌核酸呈阳性,阳性率为33.33%;28份样品检测显示副鸡嗜血杆菌核酸呈阳性,阳性率为49.12%;48份样品检测显示支原体核酸呈阳性,阳性率为84.21%;9份样品未检测到上述病原核酸,占检测总数的15.79%。说明云南省土杂鸡呼吸系统疫病由多种病原引起,其中以支原体和副鸡嗜血杆菌感染为主。 相似文献
3.
【目的】分析云南省家禽及野鸟禽腺病毒4型(Fowl adenovirus-4,FAdV-4)流行情况、Hexon基因差异性及致病性,为研究FAdV-4流行及Hexon基因对病毒毒力的影响提供参考。【方法】2020年1月―2021年6月在云南省昆明市、曲靖市、楚雄州、大理州、红河州、玉溪市等家禽养殖密集区采集疑似感染FAdV-4家禽肝脏组织样品158份,候鸟迁徙地采集野鸟新鲜粪便310份,采用PCR技术检测FAdV-4核酸,对获得的代表性阳性样品进行病原分离鉴定,并对分离毒株进行致病性及Hexon基因序列分析。【结果】家禽肝脏组织样品中检出FAdV-4核酸阳性样品19份,阳性率为12.03%(19/158);黑颈鹤粪便样品中检出核酸阳性样品1份,阳性率为0.3%(1/310)。从FAdV-4核酸阳性样品中分离到7株FAdV-4,致病性研究结果显示,FAdV-4云南分离株均能致鸡胚发育不良,引起4周龄肉鸡发生心包积液-肝炎综合征,鸡胚半数致死量(ELD50)为10―6.17~10―4.32/mL。7株分离株均聚类于FAdV-C亚群,Hexon蛋白与国内FAdV-4高致病性毒株具有相同的188R、193R、195Q特征。分离株感染SPF鸡后,临床症状明显,具有高致病性且高致死率,肝细胞病变明显。【结论】研究初步掌握了云南FAdV-4的流行情况,首次在黑颈鹤粪便中检测到FAdV-4病原核酸,分离获得7株FAdV-4,部分毒株Hexon蛋白存在氨基酸突变。 相似文献
4.
猪流行性腹泻是猪场新生仔猪腹泻的主要病原之一。为确定云南省曲靖市某猪场新生仔猪出现呕吐、腹泻和高死亡率的病因,采集病死仔猪肠道、肠系膜淋巴结、脾脏等组织病料,处理后提取病原核酸,通过RT-PCR进行导致仔猪腹泻的猪流行性腹泻病毒（PEDV）、猪传染性胃肠炎病毒、猪轮状病毒、猪伪狂犬病病毒、猪瘟病毒、猪繁殖与呼吸综合征病毒等病原核酸检测。结果显示,仅PEDV核酸阳性,其他病原均为阴性。对检出的PEDV阳性样品N基因进行序列分析发现：阳性样品N基因与河北的T10-HB2018毒株核苷酸同源性最高,为99.7%;与疫苗株AJ1102和LW/L毒株核苷酸同源性为97.4%~97.5%,在同一个分支上,均属于基因II群;与经典毒株CV777株核苷酸同源性略低,为95.7%。结果表明,引起该仔猪群腹泻的主要病因为PEDV感染,流行毒株未发生变异,当前疫苗对其防控有效。依据分析结果,该场采取PEDV疫苗紧急免疫,使疫情得到有效控制。本研究对于指导该地区猪群腹泻病防控具有参考意义。 相似文献
5.
为了分析云南省2020年度鸡呼吸系统疫病病因,分别在昆明、红河、曲靖、大理、楚雄、昭通等地111个养鸡场采集疑似发生呼吸系统疫病鸡肺脏、脾脏、喉气管等组织混合样品111份。采用PCR检测方法对疑似样品进行副鸡禽杆菌、鸡毒支原体(MG)、滑液囊支原体(MS)、新城疫病毒(NDV)、传染性支气管炎病毒(IBV)、传染性喉气管炎病毒(ILTV)、禽流感病毒(AIV)、鼻气管鸟杆菌(ORT)等传染性疾病病原核酸检测,对部分核酸样品进行测序验证。结果表明,副鸡禽杆菌、MG、MS、NDV、IBV、ILTV、ATV、ORT的检测阳性率分别为18.92%(21/111)、10.81%(12/111)、5.41%(6/111)、4.50%(5/111)、2.70%(3/111)、39.64%(44/111)、9.00%(10/111)、18.92%(21/111);混合感染占32.43%(36/111),2种、3种和4种病原混合感染分别占18.92%(21/111)、11.71%(13/111)和1.80%(2/111)。由此可见,云南省2020年度鸡呼吸系统疾病由多种原因引起,其中以副鸡禽杆菌、ILT... 相似文献
6.
为确定河南开封某猪场发生猪呼吸系统疾病综合征（PRDC）的病原,本研究无菌采集病死保育猪肺脏、心脏和脾脏等组织样品,进行细菌学检验和药敏试验,通过PCR/RT-PCR检测样品中猪繁殖与呼吸综合征病毒（PRRSV）、猪圆环病毒2型（PCV2）、猪流感病毒（SIV）、猪伪狂犬病病毒（PRV）、猪瘟病毒（CSFV）和猪肺炎支原体（Mhp）等病原,并对核酸阳性病毒性病原的抗原结构基因进行测序和遗传演化分析。结果表明,通过细菌分离培养、形态观察、卫星现象观察和16S rRNA基因鉴定,从病死保育猪体内分离鉴定出1株副猪嗜血杆菌（Hps）,药敏实验表明该菌株对对氨苄西林、阿莫西林克拉维酸、头孢噻呋和四环素几种药物敏感。核酸检测PRRSV和PCV2核酸阳性,分别命名为PRRSV/HN-2019和PCV2/HN11-2019;进一步对PRRSV/HN-2019和PCV2/HN11-2019的结构基因分析发现,PRRSV/HN-2019与与NADC30分支的毒株亲缘关系较近,属于NADC30-like毒株;PCV2/HN11-2019与PCV-2d分支的毒株亲缘关系较近,属于PCV-2d分支。综上所述,本研究确定该猪场存在PRRSV、PCV2和Hps的混合感染,为该猪场下一步的PRDC有效防控提供了参考依据。 相似文献
7.
2022年3月云南省大理市某肉鸡规模化养殖场出现疑似肉鸡感染滑液囊支原体病例。为明确病因，对病死肉鸡病料进行滑液囊支原体(Mycoplasma synoviae,MS)核酸检测和MS可变脂蛋白血凝素基因(variable lipoprotein hemagglutinin gene A,vlhA)序列分析。结果显示：6羽病死肉鸡的病料样品中均检测到MS核酸，仅1羽病死肉鸡病料样品(6号样品)检测到vlhA基因；vlhA基因序列(MS-VLHA-TSS20220711-0871-01253 GO7)与中国的CHN-JX-JX02-2014、CHN-JS01-2013、CHN-HN03-2013、CHN-GD-LZ01-2014和CHN-GD-LZ03-2014滑液囊支原体株95%同源，与泰国的AHRU2015CU3505.1及匈牙利的IZSVE/378/D13/1滑液囊支原体株94%同源。 相似文献
8.
蓝舌病病毒群特异性RT-LAMP检测方法的建立与初步应用 总被引：1，自引：0，他引：1
本研究旨在建立针对中国流行蓝舌病病毒（bluetongue virus,BTV）的逆转录-环介导等温扩增（RT-LAMP）检测方法。根据我国分离BTV毒株Seg-5基因序列的高度保守区域,设计特异性引物,优化反应条件及反应体系,进行特异性及灵敏度验证,建立BTV RT-LAMP检测方法;对46株中国分离的12种血清型BTV（BTV-1、-2、-3、-4、-5、-7、-9、-12、-15、-16、-21与-24）代表毒株进行检测,进一步对120份BTV核酸阳性血液样品及60份2020年采集自监控动物的临床血液样品进行BTV的RT-LAMP及qRT-PCR检测,验证建立的RT-LAMP检测方法的准确性和可靠性。试验结果表明,本研究建立的RT-LAMP方法最佳反应条件为64℃,扩增45 min;反应体系中外引物：内引物：环引物的最佳浓度及比例为0.2 μmol·L-1：0.6 μmol·L-1：0.4 μmol·L-1。该方法可特异性检测中国流行的12种血清型BTV核酸,与动物流行性出血病病毒（EHDV）、中山病毒（CHUV）、阿卡斑病毒（AKAV）、口蹄疫病毒（FMDV）及非洲马瘟病毒（AHSV）核酸均无交叉扩增现象;最低可检测4.5拷贝·μL-1的BTV核酸。对46株分属12种血清型的BTV代表毒株的检测结果均为阳性;120份BTV核酸阳性血液样品的检测结果与qRT-PCR检测结果无显著差别（McNemar检验P>0.05）,符合率为95.0%;60份临床血液样品的检测结果与qRT-PCR结果完全一致,以上结果表明本研究建立的RT-LAMP方法准确可靠,对中国分离的BTV毒株及临床血液样品均具有良好的检测效果。本研究建立的BTV RT-LAMP检测方法具有反应快速、结果可视化、特异性强和敏感度高等优点,为我国开展BTV检测诊断与流行病学研究提供了技术支持,具有较好的应用前景。 相似文献
9.
为了解福建省鸡场圆圈病毒3型（GyV3）的流行及其VP2基因变异情况，2021年在南平市、龙岩市和福州市的36个鸡场，采集365份疑似GyV3感染病鸡的腺胃样品，通过PCR进行GyV3核酸检测。结果显示：共检出GyV3核酸阳性55份，阳性检出率为15.06%。对5份GyV3阳性样品进行VP2基因序列分析发现，5份样品的VP2基因核苷酸和推导氨基酸序列相似性分别为98.6%~99.9%和98.3%~100%，与参考株山东肉鸡分离株SDAU-1和巴西家鸡分离株核苷酸和推导氨基酸序列的相似性分别为98.3%~99.2%和97.5%~99.2%，均属于Group A分支中的GyV3小分支。结果表明：福建省鸡场存在GyV3流行；其VP2基因遗传序列稳定，可作为GyV3感染流行病学监测的首选基因。本研究为GyV3的后续研究提供了理论依据。 相似文献
10.
2022年10月中旬，湖南长沙某规模化猪场发生疑似猪繁殖障碍综合征疫情。为探究发病原因，采集病料样品进行细菌分离鉴定和常见病原荧光定量PCR（q PCR）鉴定。结果发现，病料样品中未分离得到细菌，q PCR检测结果显示组织病料为HP-PRRSV和NADC30-like毒株核酸阳性，其他病原核酸均为阴性。为进一步分析该猪场PRRSV流行株遗传变异情况，对PRRSV Nsp2基因序列进行逆转录PCR（RT-PCR）扩增、测序及分析。结果显示，HP-PRRSV株Nsp2基因序列与Hu N4-F112株（PRRSV弱毒疫苗株）同源性最高，类NADC30株Nsp2基因序列与已知NADC30株同源性最高。以上研究结果表明，该场疫情是HP-PRRSV和类NADC30株混合感染引起，其中HP-PRRSV可能为弱毒疫苗株。 相似文献
11.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(9):347-350
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario.
Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously.
相似文献12.
Heartworm in dogs in Canada in 1982 总被引：8，自引：8，他引：0
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(7):227-229
13.
Owen J Slocombe D McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(9):324-328
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%).
Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada.
相似文献14.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(6):504-508
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
15.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1985,26(10):323-327
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal.
Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection.
相似文献16.
17.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated.
Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively.
相似文献18.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(8):641-646
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
19.
Owen J Slocombe D McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1987,28(8):491-495
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%).
Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada.
相似文献20.