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1.
从黑龙江省某牛场当中患有呼吸系统疾病的病牛鼻拭子中分离到一株病毒,该病毒在MDBK细胞上能够产生典型的病变。经免疫荧光鉴定表明成功分离到一株牛副流感病毒3型,命名为HLJ1。将病毒的M基因与GenBank中已发表BPIV3毒株的M基因进行同源性比较及系统进化分析,结果表明HLJ1与BPIV3c型参考毒株NX49的同源性最高为99.7%,因此HLJ1分离株属于c基因型BPIV3。我们的结果将为牛副流感病毒3型检测试剂盒及疫苗的研发工作奠定基础。  相似文献   

2.
利用4型禽腺病毒HLJ1701株进行灭活疫苗的研制,并对疫苗的免疫效果进行评价,为家禽4型禽腺病毒的防控提供数据及参考。将HLJ1701株用灭菌生理盐水作10~4倍稀释后,接种9日龄SPF鸡胚,37℃孵育72 h后收获感染鸡胚尿囊液,经甲醛灭活后,加白油佐剂乳化制成油乳剂灭活疫苗,对制备疫苗的性状、安全性、免疫效力等进行检验。结果显示,制备的3批4型禽腺病毒灭活疫苗(HLJ1701株)均为油包水型,黏度均在50 cP以内,对3批疫苗取样,样品经3000 r/min离心15 min,管底无水相析出。安全性试验结果显示,将疫苗按1 mL/只超剂量接种3周龄SPF鸡,试验鸡在观察期内全部健活,未出现局部或全身不良反应,表明疫苗对SPF鸡具有良好的安全性;免疫效力及攻毒保护试验结果显示,用疫苗按0.2 mL/只的剂量免疫接种3周龄SPF鸡1次,免疫接种后21d试验鸡血清中HLJ1701株的抗体平均效价可达2~8以上,使用4型禽腺病毒(HLJ1701株)接种0.2 mL/只(100 LD_(50))对免疫鸡进行攻毒,疫苗对免疫鸡的保护率均为100%。研究表明,实验室条件下研制的4型禽腺病毒(HLJ1701株)灭活疫苗的各项指标均符合标准。  相似文献   

3.
用从病犬分离的犬传染性肝炎病毒(ICHV)免疫BALB/C 小鼠,取其脾细胞与 SP_2/O 骨髓瘤细胞融合,通过 HI 试验筛选出4株分泌抗 ICHV 单克隆抗体的杂交瘤细胞株(C_2B_5、C_4B_8、D_4E_4、G_(10)C_(10))。HI 试验和斑点酶联免疫吸附试验(Dot-ELISA)进行特异性鉴定表明:4株单抗与鸡新城疫病毒(NDV)、牛腺病毒(BAV)、禽腺病毒(Oet株)、犬瘟热病毒(CDV)、犬细小病毒(CPV)均无反应,仅与 ICHV 苗德株反应。杂交瘤细胞株在液氮中保存3个月复苏,仍可分泌特异性抗体。  相似文献   

4.
为研究分离自黑龙江三江自然保护区的野生绿头鸭粪拭子中的一株新城疫病毒(命名为Mallard/CH/HLJ383/06)主要生物学特性及基因组序列,本实验对病毒F基因序列进行测定,结果表明该病毒分离株属于NDV基因Ⅲ型,病毒的1日龄雏鸡脑内致病指数(ICPI)为1.81,高于NDV中等毒力病毒株ICPI值,预示该病毒分离株毒力有增强趋势.15日龄SPF鸡致病性试验表明,该病毒分离株可导致雏鸡发病但不死亡,致病性仍低于与其ICPI值相近的基因Ⅶ型毒株.对该病毒分离株进行全基因组序列分析表明:该病毒分离株与Ⅰ系疫苗病毒Mukteswar、江苏2株基因Ⅲ型分离株(JS/7/05/Ch,JS/9/05/Go)结构蛋白氨基酸同源性高达99.0%～99.7%;与疫苗株Mukteswar相比,3株基因Ⅲ型病毒分离株在F蛋白中只有1个共同的氨基酸位点变异(A203T);HN蛋白中存在15个变异氨基酸,但位置各不相同;L蛋白中变异位点最多,为28个,其中有4个变异位点为3个分离株所共有.以上结果初步表明,Mallard/CH/HLJ383/06株可能是由疫苗株Mukteswar在野禽、家禽生态系统中传播进化而来,并由于宿主或免疫压力而发生毒力变异;分离株L蛋白氨基酸位点的变异,可能是导致病毒株毒力返强主要因素之一.  相似文献   

5.
为研制口蹄疫病毒(FMDV)的新型重组腺病毒疫苗,本研究通过RT-PCR扩增FMDV GD株3C、P1、P1-2A、L-P1和L-2A基因,分别构建重组腺病毒穿梭质粒,并在含有腺病毒骨架质粒pAdEasy-1的BJ5183E.coli中同源重组获得腺病毒重组质粒pAd-3C、pAd-P1、pAd-P1-2A、pAd-L-P1、pAd-L-2A,经PacⅠ线性化后转染AD-293细胞,获得含有目的基因的重组腺病毒。将具有感染能力的复制缺陷型重组腺病毒rAd-3C分别与rAd-P1、rAd-P1-2A、rAd-L-P1、rAd-L-2A共感染Vero细胞,裂解细胞收集细胞上清液并进行小鼠免疫试验。经ELISA检测表明,重组腺病毒rAd-3C分别与rAd-P1-2A、rAd-L-2A共感染Vero细胞上清液能够诱导小鼠产生特异性体液免疫应答。  相似文献   

6.
本研究旨在了解云南省景洪市虫媒病毒的流行情况。2019年在景洪市勐罕镇设立了3头哨兵动物牛,定期采血进行虫媒病毒的分离与鉴定,共获得7株病毒分离物。经病毒核酸的RT-PCR鉴定,分离到2株血清型分别为6型和7型流行性出血热病毒（epizootic haemorrhagic disease virus,EHDV）,2株血清型分别为4型和5型的蓝舌病病毒（bluetongue virus,BTV）,1株帕利亚血清群病毒（palyam serogroup virus,PALV）中的D’Aguilar virus（DAV）血清型病毒和2株未鉴定出的环状病毒。经病毒Seg-2、Seg-3序列ORF区的比对和进化分析显示,7株病毒的地域型均为Eastern型,与日本、澳大利亚和印度毒株具有最近的亲缘关系。3头哨兵动物的血液和血清,经病毒核酸及血清中和试验检测,证明3头动物均被相应的病毒感染。动物感染病毒后,血清中的特异性抗体迅速上升,3~4周后达最高点并能够在该水平维持较长时间,而血液中病毒核酸含量2~4周到达最高点后则呈迅速下降趋势。本研究报道了景洪虫媒病毒的分离、毒株序列特征以及在动物上的感染特性,研究结果为进一步了解当地的牛虫媒病毒提供数据支撑,同时3头牛分离获得7株病毒,提示当地可能还存在更多种类的虫媒病毒。  相似文献   

7.
为了对Ⅰ群禽腺病毒血清4型(FAdV-4)的毒株进行分离,试验采用病毒分离、DNA提取、PCR鉴定、Hexon基因序列分析、病毒毒价测定、病毒形态学观察及动物回归试验等方法对青岛地区疑似心包积水及包涵体肝炎病鸡的肝脏进行了研究。结果表明:该分离毒株提取的DNA经PCR鉴定为阳性;该分离毒株序列与已发表的Ⅰ群禽腺病毒4型序列同源性为97.7%,病毒毒价为1×10~8TCID_(50)/0.1 mL;病毒形态为球形、无囊膜、二十面体对称的粒子结构;在动物回归试验中,病死肉鸡心包有积液,发病鸡肝脏的中央静脉广泛淤血,肝细胞发生空泡样变性,细胞浆和细胞核内可见嗜碱性包涵体。说明该分离株为Ⅰ群禽腺病毒血清4型毒株。  相似文献   

8.
1953年,Rowe等首次由人的手术切除的扁桃体组织,用血浆埋块培养分离得到一株病毒,以后他人又陆续从人和其他哺乳动物、禽类中分离到类似的病毒.因为最初是从腺体组织分离得到,故名腺病毒.它分为两个属:哺乳动物腺病毒和禽类腺病毒[1].该病毒是无囊膜的线性双链DNA病毒[2,3],腺病毒在自然界分布广泛,至少存在100种以上的血清型,基因组长约36 kb,其两端各有一个反向末端重复区(ITR),ITR内侧为病毒包装信号.基因组上含有早期转录基因(E)和晚期转录基因(L),早期转录基因包括E1A、E1B、E2A、E2B、E3、E4, 晚期转录基因为L1、L2、L3、L4、L5[4].  相似文献   

9.
四川省某肉牛场新引进的犊牛出现发热、咳嗽、呼吸困难、流鼻涕等呼吸道症状,为了解该病的病因,本试验采集了10份病牛深部鼻腔棉拭子样本,采用PCR方法检测了牛冠状病毒（BCoV）、牛病毒性腹泻病毒（BVDV）、牛传染性鼻气管炎病毒（IBRV）、牛腺病毒3型（BAV-3）、牛支原体（M.Bovis）、多杀性巴氏杆菌（P.multocida）、溶血性曼氏杆菌（M.haemolytica）及睡眠嗜组织菌（H.somni）等8种常见呼吸道病原。结果显示：BCoV检出率为70%,BVDV检出率为30%,其余病原均未检出,表明该肉牛场犊牛的呼吸道疾病是由BCoV和BVDV混合感染引起的。  相似文献   

10.
为明确鸭腺病毒A型Hexon基因特征及其在腺病毒科病毒分类中的作用,本研究从前期分离鉴定的一株番鸭源鸭腺病毒A型分离株（JX2016株）中分段扩增获得其Hexon基因编码区。结果发现,鸭腺病毒A型JX2016株Hexon基因编码区为2 733 bp,编码910个氨基酸,与鸭腺病毒A型（FJ12025株）核苷酸同源性最高,达99.8%;与其他分离株Hexon基因核苷酸同源性均在99.4%以上;与鸭腺病毒2型（GR株,未明确分类地位）同源性仅为54.5%;与禽腺病毒A型Phelps株（鸡源）及P29株（鹅源）的核苷酸同源性分别为53.6%和55.2%。遗传进化树分析发现,所有鸭腺病毒A型分离株在遗传进化上均处于相同的亚分支,且与绵羊腺病毒D型（OAV287株）均处于富AT腺病毒属遗传进化分支。但鸭腺病毒2型（GR株）与禽腺病毒A型Phelps株（鸡源）、P29株（鹅源）却处于同一遗传进化分支,均属于禽腺病毒属遗传进化分支。基于Hexon蛋白的遗传进化分析,建议将鸭腺病毒A型重新命名为鸭源富AT腺病毒A型,将鸭腺病毒2型重新命名为鸭源禽腺病毒。  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.
Tropical Animal Health and Production -  相似文献   

14.
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   

15.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

16.
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   

17.
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   

18.
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   

19.
The objective of this report was to characterize 20-year changes in proportion of calcium oxalate (CaOx) calculi and struvite calculi in dogs, and associations with breed, age, and sex. In this retrospective study, results of analysis of urinary calculi from dogs were reviewed for specimens received between July 1, 1981, and December 31, 2001. Breed, sex, age, year of submission of the specimen, and mineral type(s) were analyzed statistically. CaOx or Struvite or both were contained in 18,966 of 20,884 (91%) specimens. For both sexes, a 20-year statistically significant increase was observed in the proportion of calculus specimens that contained CaOx. The increase in this proportion was greater in females (1% to 31%) than in males (18% to 82%). From 1998 to 2001, when proportions may have plateaued, the odds of specimens containing CaOx were markedly higher in 18 breeds, markedly lower in 5 breeds, and not significantly different in 13 breeds compared with crossbreds. For both sexes, a 20-year statistically significant decrease was observed in the proportion of calculus specimens that contained struvite. This decrease in proportion was greater for males (79-16%) than for females (97-68%). From 1998 to 2001, when proportions plateaued, the odds of calculi containing struvite were markedly lower in 20 breeds, markedly higher in 1 breed, and not significantly different in 15 breeds when compared with crossbreds. Breed, age, and sex were associated statistically with CaOx or struvite urolithiasis. In conclusion, there appears to have been a long-term increase in the proportion of specimens of canine urinary calculi that contain CaOx as well as a long-term decrease in the proportion of specimens of calculi that contain struvite for both male and female dogs. The rate of change appeared to begin leveling off in the period 1998 to 2001. The recent proportion of dogs with either CaOx- or struvite-associated urolithiasis may depend on breed, age, and sex, and on interactions among these 3 factors.  相似文献   

20.
<正>1.INTRODUCTION Ensuring transportation network security is one Of the most daunting challenges confronting homeland security agencies today.Significant research has been dedicated.To model and analyze the vulnerability of transportation systems,while notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems.  相似文献   

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