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1.
PRV、PCV-2、PPV多重PCR检测方法的建立及其应用   总被引:3,自引:0,他引:3  
根据GenBank上已发表的猪伪狂犬病病毒(PRV)、猪Ⅱ型圆环病毒(PCV-2)、猪细小病毒(PPV)核苷酸序列,设计并合成能分别特异性扩增PRV、PCV-2、PPV的引物。经条件优化,建立了同时检测PRV、PCV-2、PPV的多重PCR方法,所扩增特异性产物片段大小分别为217bp、394bp、748bp。该方法不仅特异性强、敏感性高,还克服了对上述病原分别进行检测所带来的诸多弊端,为猪伪狂犬病、猪Ⅱ型圆环病、猪细小病的临床诊断和流行病学调查等研究提供了新手段。  相似文献   

2.
猪圆环病毒复合PCR检测方法的建立   总被引:7,自引:0,他引:7  
根据已发表的PCV—1和PCV-2全基因组序列,设计了3条引物,组成PCV-2的特有引物对和PCV-1、PCV-2的共有引物对,分别扩增长度为472bp和339bp的片段。为验证PCR扩增的特异性,将472bp的扩增产物纯化后,克隆到pMD18-T载体,转化大肠埃希氏菌TG1,对阳性克隆进行酶切及PCR鉴定,并测序。将该序列递交NCB1进行BL-AST同源序列比较,发现它与美国、加拿大及我国台湾的PCV-2毒株核苷酸序列的同源性均在99%以上,与PCV—1毒株的同源性为86%。结果显示,该方法最少可用于3μg病料组织和0.75pg DNA的PCV-2检出.具有很高的灵敏性。应用该PCR方法检测了浙江省和上海市47份“猪高热综合征”病料,PCV-2感染阳性率为36.17%,PCV—1单独感染阳性率为34.04%。  相似文献   

3.
四川猪圆环病毒Ⅱ型的检测   总被引:1,自引:1,他引:1  
据文献资料设计一对引物,初步建立了检测猪圆环病毒II型(PCV-2)核酸片段的PCR方法。从可疑病料中扩增出了预期长度为473bp的DNA片段,用另一套引物证实了PCR产物的特异性。首次证实了四川地区猪群中存在PCV-2感染,为进一步研究打下了基础。  相似文献   

4.
根据猪圆环病毒2型(PCV-2)全基因组序列,设计一对特异性引物,从疑似断奶仔猪多系统衰竭综合征(PMWS)病料中扩增出PCV-2基因组DNA,将基因片段克隆于pMD18-T载体,筛选获得含有相应片段的阳性重组质粒pMD18-T-PCV-2。对筛选出的阳性质粒进行测序。结果表明,PCV山东株的全基因组为1 767 bp,与国内外毒株核苷酸同源性高达99.6%。  相似文献   

5.
根据 GenBank 中猪圆环病毒Ⅱ型(PCV- 2)ORF2基因序列,设计一对引物,应用PCR从疑似断奶仔猪多系统消耗综合征(PMWS)的死亡仔猪组织病料中扩增出 ORF2 基因(702 bp)。将此基因片段克隆入 pMD -18 T载体,筛选获得重组质粒 pMD ORF2 并对其测序,结果表明所克隆的ORF2基因与德国分离株AF201897核苷酸序列同源性为99.5%与其它PCV- 2 的 ORF2 核苷酸序列同源性在92.1%~99.9%之间,推导的氨基酸序列同源性在90.2%~99.5%之间。  相似文献   

6.
根据GenBank上已发表的猪伪狂犬病病毒(PRV)、猪Ⅱ型圆环病毒(PCV-2)、猪细小病毒(PPV)核苷酸序列,设计并合成能分别特异性扩增PRV、PCV-2、PPV的引物。经条件优化,建立了同时检测PRV、PCV-2、PPV的多重PCR方法,所扩增特异性产物片段大小分别为217bp、394bp、748bp。该方法不仅特异性强、敏感性高,还克服了对上述病原分别进行检测所带来的诸多弊端,为猪伪狂犬病、猪Ⅱ型圆环病、猪细小病的,临床诊断和流行病学调查等研究提供了新手段。  相似文献   

7.
为了建立可同时检测猪伪狂犬病病毒(PRV)和猪圆环病毒2型(PCV-2)的多重PCR检测方法,本研究根据GenBank中登录的PRV gE基因和PCV-2 ORF2基因的核苷酸序列,分别设计了2对特异性引物PRV-S/PRV-A和PCV-2-S/PCV-2-A,产物分别为270 bp和189 bp。检测结果显示,该方法具有较高特异性,检测PRV和PCV-2的DNA最低量均为1×10~(-4)μg/μL。对136份临床上疑似为PRV和PCV-2感染病料样品进行检测的结果表明,本研究建立的多重PCR检测方法可用于临床上PRV和PCV-2引起的单纯或混合感染的传染病病原学诊断。  相似文献   

8.
参照国外发表的猪圆环病毒2型(Porcine circovirus type 2,PCV-2)全基因组序列,设计合成了1对特异性引物,从上海市临床病料中提取PCV-2基因组DNA,进行PCR全基因扩增。回收PCR产物,将其插入pMD18-T载体,并对筛选出的阳性质粒进行测序。应用DNAStar序列分析软件,对所测PCV-2序列与GenBank中登录的国内外PCV-2毒株进行同源性比较。结果显示,PCV-2上海株与国内外毒株的核苷酸同源性高达95.0%~100%。进化树分析结果显示,其中9株PCV-2病毒属于PCV-2b亚型,3株PCV-2病毒属于PCV-2a亚型,且9株PCV-2b亚型毒株部分核苷酸位点显示其属于强毒力毒株。研究表明,上海市PCV-2感染以PCV-2b亚型为主,且氨基酸位点表明其具有较高的毒力。  相似文献   

9.
猪圆环病毒2型的分离与鉴定   总被引:16,自引:1,他引:15  
利用PCR方法,从疑似断奶猪多系统衰竭综合征(PMWS)的自然病例的淋巴结和脾脏中扩增出了预期长度的猪圆环病毒2型(Porcine Circovirus type 2,PCV2)的DNA片段,并用限制性内切酶对PCR产物进行了酶切鉴定。将经PCR扩增和酶切鉴定为PCV2阳性的组织样品匀浆液接种到无PCV污染的PK15细胞中传代,经间接免疫荧光检查,在接毒细胞内观察到了特异性免疫荧光;用接毒细胞制备超薄切片,在电镜下观察到了直径大约为17nm的圆形病毒样粒子和大量不同形态的胞浆内包涵体。由此表明分离出的病毒为猪圆环病毒2型。  相似文献   

10.
参照GenBank中登录的猪圆环病毒2型(PCV-2)全基因组序列,设计合成了两对特异性引物,从甘肃白银疑似断奶仔猪多系统衰竭综合征(PMWS)病料中提取病毒DNA,分步扩增全基因组。回收PCR产物,将其插入pGEM-TEasy载体,构建了重组质粒pGEM-PCV-2,转化后筛选、提取阳性重组质粒进行测序。结果表明,克隆到的PCV-2全基因组长度为1767bp。应用DNAStar序列分析软件,对所测PCV-2序列与GenBank中登录的包括甘肃在内的国内外PCV毒株进行同源性分析。结果显示,克隆的PCV-2与英国株(UK-EU656143)遗传关系最近,其核苷酸和推导的氨基酸序列同源性高达96.2%和91.0%,与已报道的2株甘肃毒株(GS03-EU547458,GSLZ-FJ447482)遗传关系较远,可能是流行于甘肃白银的一个变异毒株(GSBY)。  相似文献   

11.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

12.
试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。  相似文献   

13.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

14.
Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal (GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April 2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes. But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia.  相似文献   

15.
The purpose of this study was to determine the frequency of different tumor types within a large cohort of cats with intracranial neoplasia and to attempt to correlate signalment, tumor size and location, and survival time for each tumor. Medical records of 160 cats with confirmed intracranial neoplasia evaluated between 1985 and 2001 were reviewed. Parameters evaluated included age, sex, breed, FeLV/FIV status, clinical signs, duration of signs, number of tumors, tumor location(s), imaging results, treatment, survival times, and histopathologic diagnosis. Most of the cats were older (11.3 +/- 3.8 years). Primary tumors accounted for 70.6% of cases. Metastasis and direct extension of secondary tumors accounted for only 5.6 and 3.8% of cases, respectively. Twelve cats (7.5%) had 2 or more discrete tumors of the same type, whereas 16 cats (10.0%) had 2 different types of intracranial tumors. The most common tumor types were meningioma (n = 93, 58.1%), lymphoma (n = 23, 14.4%), pituitary tumors (n = 14, 8.8%), and gliomas (n = 12, 7.5%). The most common neurological signs were altered consciousness (n = 42, 26.2%), circling (n = 36, 22.5%), and seizures (n = 36, 22.5%). Cats without specific neurological signs were common (n = 34, 21.2%). The tumor was considered an incidental finding in 30 (18.8%) cats. In addition to expected relationships (eg, meninges and meningioma, pituitary and pituitary tumors), we found that lesion location was predictive of tumor type with diffuse cerebral or brainstem involvement predictive of lymphoma and third ventricle involvement predictive of meningioma.  相似文献   

16.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

17.
18.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

19.
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.  相似文献   

20.
正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in  相似文献   

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