首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 218 毫秒
1.
为了解山东省犬细小病毒(CPV)流行毒株的遗传变异情况及其与犬细小病毒病的分子流行病学关系,对2013年分离到的12株山东CPV流行毒株进行了VP2基因克隆测序与同源性分析,绘制系统进化树。结果表明,获得的VP2基因的全长为1 755 bp,编码584个氨基酸残基;各分离毒株之间的核苷酸和氨基酸同源率分别为98.9%~100.0%和98.8%~100.0%,与Gen Bank公布的国内外参考毒株核苷酸和氨基酸同源率在98%以上,分离株VP2基因及其推导的氨基酸的变异主要以点突变为主,关键氨基酸位点未见明显改变。遗传进化分析显示,有8株为New CPV-2a,4株为New CPV-2b,表明目前山东省所流行的CPV主要以New CPV-2a亚型为主。研究结果为山东犬细小病毒病的防控提供了依据。  相似文献   

2.
为了解广西南宁地区犬细小病毒（CPV）的流行现状与病毒变异情况,本试验对初步确诊为犬细小病毒病的12份阳性病料提取基因组DNA,以提取的基因组DNA为模板,通过PCR扩增VP2基因序列并测序,将12个阳性毒株样本VP2基因测序结果与GenBank中登录的17株国内外CPV分离株VP2基因进行同源性比对,采用Mega 7.0软件绘制遗传进化树,分析其病毒亚型和遗传进化情况。结果显示,成功扩增得到12个毒株样本的VP2基因片段,大小约1 755 bp,12株阳性样本毒株的VP2基因同源性在99.2%~100.0%之间,其中NN01与NN07、NN02与NN06同源性最高,为100.0%;阳性样本毒株与国内其他分离株VP2基因的同源性为97.6%~100.0%,其中NN08、NN10及NN04与CPV-ZJ1579同源性最高,均为100.0%,属于CPV-2a亚型;阳性样本毒株与国外代表性毒株同源性在98.1%~99.8%之间。遗传进化树分析表明,12个样本毒株中有3株属于CPV-2a亚型,3株属于CPV-2b亚型,6株属于CPV-2c亚型。这是继2018年初广西分离到CPV-2c型CPV后,首次发现南宁地区大规模流行CPV-2c亚型病毒,预示着CPV-2c亚型CPV在国内的流行正在增加。综上所述,广西南宁地区CPV-2a、CPV-2b与CPV-2c亚型并存,但CPV-2c亚型的比重比其他地区大,这也给该地区提供了新的防治信息,在实际CPV防控工作中除了对CPV-2a、CPV-2b等传统流行亚型的关注之外,更应该重视CPV-2c亚型CPV的防控。  相似文献   

3.
为研究贵阳地区犬细小病毒（canine parvovirus,CPV）的流行基因型及其遗传进化情况,本试验对从贵阳市分离的10株CPV的VP2基因进行PCR扩增和克隆并进行序列分析。结果显示,分离的病毒能使F81猫肾细胞产生明显的细胞病变（CPE）,分离的10株病毒中,7株为CPV-2a亚型,3株为CPV-2c亚型,命名为GY-1~GY-10。10株CPV分离株与疫苗株VP2基因的同源性98.4%~99.4%,与其他国内外参考株的同源性为97.7%~99.9%。本试验首次报道贵阳市CPV的流行基因型为CPV-2a亚型并伴随CPV-2c亚型存在,对监测CPV遗传变异趋势及疫苗的研制具有重要意义。  相似文献   

4.
为了解广西南宁地区犬细小病毒(CPV)的流行现状与病毒变异情况,本试验对初步确诊为犬细小病毒病的12份阳性病料提取基因组DNA,以提取的基因组DNA为模板,通过PCR扩增VP2基因序列并测序,将12个阳性毒株样本VP2基因测序结果与GenBank中登录的17株国内外CPV分离株VP2基因进行同源性比对,采用Mega 7.0软件绘制遗传进化树,分析其病毒亚型和遗传进化情况。结果显示,成功扩增得到12个毒株样本的VP2基因片段,大小约1 755bp,12株阳性样本毒株的VP2基因同源性在99.2%～100.0%之间,其中NN01与NN07、NN02与NN06同源性最高,为100.0%;阳性样本毒株与国内其他分离株VP2基因的同源性为97.6%～100.0%,其中NN08、NN10及NN04与CPV-ZJ1579同源性最高,均为100.0%,属于CPV-2a亚型;阳性样本毒株与国外代表性毒株同源性在98.1%～99.8%之间。遗传进化树分析表明,12个样本毒株中有3株属于CPV-2a亚型,3株属于CPV-2b亚型,6株属于CPV-2c亚型。这是继2018年初广西分离到CPV-2c型CPV后,首次发现南宁地区大规模流行CPV-2c亚型病毒,预示着CPV-2c亚型CPV在国内的流行正在增加。综上所述,广西南宁地区CPV-2a、CPV-2b与CPV-2c亚型并存,但CPV-2c亚型的比重比其他地区大,这也给该地区提供了新的防治信息,在实际CPV防控工作中除了对CPV-2a、CPV-2b等传统流行亚型的关注之外,更应该重视CPV-2c亚型CPV的防控。  相似文献   

5.
为了了解豫南地区犬细小病毒(canine Parvovirus, CPV)流行株的遗传变异特征，试验利用PCR方法从临床采集的CPV阳性犬的粪便中扩增CPV的VP2和NS1基因，并测定核苷酸序列，利用软件Meglign 7.0推导VP2和NS1基因的氨基酸序列并构建进化树，进行同源性和氨基酸变异分析。结果表明：从8份粪便样品中分离得到8株CPV流行株，分别命名为CH-XY-1～CH-XY-8。基于VP2基因推导的氨基酸序列，豫南地区流行株CH-XY-7和CH-XY-8为New CPV-2a亚型，CH-XY-5为New CPV-2b亚型，CH-XY-1、CH-XY-2、CH-XY-3、CH-XY-4和CH-XY-6为CPV-2c亚型，CH-XY-3和CH-XY-6分别存在1个(G299R)和2个(V84E和V153A)新的氨基酸变异。基于NS1基因推导的氨基酸序列，流行株CH-XY-5、CH-XY-6、CH-XY-7和CH-XY-8分布在GroupⅠ群，其中CH-XY-6和CH-XY-8分别存在1个新的氨基酸变异位点，分别为N356K和E583K;CH-XY-1、CH-XY-2、CH-X...  相似文献   

6.
《中国兽医学报》2016,(5):734-738
为了更好的了解我国东北地区犬细小病毒的流行情况,采用F81细胞从来自长春某宠物医院疑似患有肠炎的犬粪便样品中分离出1株病毒,经形态学、血清学、动物回归试验和分子生物学鉴定,分离的病毒为犬细小病毒new CPV-2b型,命名为CPV JL13-1。对该病毒主要结构蛋白VP2基因进行克隆测序和基因进化分析表明,CPV JL13-1分离株VP2基因与GenBank上提交的其他41株犬细小病毒株核苷酸和氨基酸均有较高的同源性,分别为98.6%~99.5%和97.6%~99.5%,其中核苷酸和氨基酸同源性最高的均为B-2004株。本研究为犬细小病毒分子流行病学调查和疫苗的研究奠定基础。  相似文献   

7.
从北京地区疑似细小病毒感染的犬粪拭子中成功分离鉴定出14株犬细小病毒（CPV）毒株,并对其完整的VP2和NS1基因进行了序列分析。结果表明,鉴定到的14株CPV毒株中,7株为New CPV-2a型,7株为CPV-2c型。此外,NS1的19、33、293、588、624和656位氨基酸以及VP2的13、574位氨基酸为新鉴定的氨基酸突变位点。基于VP2、NS1基因的系统进化分析表明,大部分的New CPV-2a型和CPV-2c型毒株与广西南宁和吉林长春地区的分离毒株亲缘关系密切,说明本次分离毒株与广西或吉林地区分离毒株具有相同的起源。本研究为更好地开展犬细小病毒流行病学调查提供了有益借鉴,也为深入研究犬细小病毒变异和传播的分子机制奠定了基础。  相似文献   

8.
为了解珠三角地区犬细小病毒(CPV)的流行情况及研制有效的疫苗,本研究开展了CPV流行病学调查,并将32份疑似CPV感染犬的粪便样品处理后接种F81细胞进行病毒分离,并对分离株进行鉴定。鉴定结果显示:32份样品中有19份样品提取液在F81细胞上可以产生明显的细胞病变;HA效价可达到1∶256。回归动物试验显示分离株可以导致犬出现明显的CPV感染症状,PCR鉴定也进一步确定所分离的病毒为CPV。通过VP2基因同源性分析显示分离株与国内主要的流行基因亚型CPV-2a的同源性达98%以上。  相似文献   

9.
从疑似患细小病毒性肠炎的貉子肠道组织样品中分离到一株貉细小病毒(RDPV-SD1607)。为研究其分子遗传特征,对该分离株VP2基因进行克隆序列分析,结果显示,RDPV-SD1607的VP2序列与RDPV-HB3的相似性最高,为99.49%,属于CPV-2亚型;利用其核苷酸序列建立系统进化树发现,RDPV-SD1607处于犬细小病毒分支,且处于CPV-2亚型和CPV-2a亚型分支之间。结果表明,RDPV-SD1607株与犬细小具有共同的遗传起源,推测其可能正处于CPV-2亚型向CPV-2a亚型进化的中间状态,或是CPV适应貉而形成的新毒株。  相似文献   

10.
为分离犬细小病毒毒株,对临床经胶体金试纸条检测CPV阳性的8份犬粪便样品进行VP2全长编码片段扩增与测序。VP2片段序列分析结果显示,8株临床样品的VP2基因全长均为1 755 bp,氨基酸的同源性为98.5%～100%。遗传进化分析显示,所有分离的毒株均与所参考的中国分离株在一个分支上。其中1株属于New CPV-2b,其余7株均为New CPV-2a。在序列分析基础上,选择北京地区的1份犬粪便样品,接种F81细胞进行病毒分离。粪便样品接种F81细胞盲传5代后出现典型的病变。对该毒株进行电镜观察、免疫荧光试验以及蛋白电泳鉴定。电镜观察显示病毒粒子的外形结构为圆形或六边形,直径约25 nm,可见实心和空心病毒粒子。间接免疫荧光结果显示,接种病毒液的细胞出现特异性亮绿色荧光信号,对照细胞无荧光信号。纯化后的病毒蛋白电泳显示两条清晰的条带分别为VP1(76 ku)、VP2(64 ku)。结果表明,成功分离到1株New CPV-2a亚型毒株,并将其命名为CPV BJ-1株。  相似文献   

11.
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   

12.
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   

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.
Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded.  相似文献   

15.
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   

16.
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   

17.
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   

18.
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   

19.
Infectious diseases have always been a terrible scourge for humans. The appearance of these plagues, as they were called without distinction, was generally connected to various conditions: asters, climatic changes or religious reasons. The concept of contagious, and then infectious, diseases came slowly. Variolation, i.e. transmission of ‘virulent’ matter to induce a natural disease and the immunity against it, was brought from Constantinople to England by Lady Montague, in 1721. This ‘variolation’ technique was also often performed in veterinary medicine against diseases like sheep-pox or pleuropneumonia. As ‘vaccination’ is the term generally accepted for ‘immunisation’, variolation can be the word designating such a technique. The second period of the history of immunisation began, in 1880, with the studies of Pasteur and his collaborators. A great number of bacterial vaccines were developed: dead, live but attenuated or only parts of pathogens. The viruses were produced in animals, then in eggs and at last, in tissue cultures. Second generation vaccines appeared with genetic engineering: recombinant vaccines, vector vaccines, nucleic acids vaccines, and markers vaccines, among others. These novel technologies can permit the development of new ones and improve the quality of the vaccines already existing.  相似文献   

20.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号