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为了掌握湟中县牦牛病毒性腹泻病原的流行现状,对湟中县内11个乡镇的138份腹泻牦牛粪便样品进行了牛病毒性腹泻病毒(BVDV)、牛肠道病毒(BEV)、牛轮状病毒(BRV)、牛冠状病毒(BCV)和牛星状病毒(BAstV) 5种病毒性腹泻致病原进行检测与分析。结果:BVDV、BEV、BRV、BCV和BAstV的平均感染率分别为44. 93%、21. 74%、8. 70%、5. 07%和6. 52%,5种病原中BVDV和BEV在所有乡镇均有流行,BRV、BCV、BAstV在部分乡镇呈散发性流行; 5种病原在1～6月龄犊牦牛中的检出率明显高于6月龄以上成年牦牛。138份腹泻牦牛中存在BVDV、BEV、BRV、BCV、BAstV的单独感染和混合感染,总单感率为53. 62%;共存在10种混感型,总混感率为15. 22%。表明湟中县牦牛存在BVDV、BEV、BRV、BCV和BAstV的感染,且混合感染情况复杂,应引起高度重视。 相似文献
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利用多重荧光定量RT-PCR （real-time RT-PCR）方法,提高对多病原检测的速度和灵敏度,促进对犊牛腹泻的快速诊断和及时治疗。分别在牛星状病毒（BAstV）ORF2基因,牛病毒性腹泻病毒1型（BVDV-1）5'端非编码区,牛冠状病毒（BCV）N pro基因和牛轮状病毒（BRV）VP6基因的保守基因序列设计、合成并试验筛选了四对有效的特异性引物和探针。进一步利用含4种病毒目的片段的重组质粒,对引物和探针的浓度以及反应条件进行了优化,建立了Real-time RT-PCR标准曲线,并对四重Real-time PCR方法的特异性、敏感性、重复性和各种临床样本的适用性进行了评价。结果显示：Real-time RT-PCR最适退火温度和时间分别为50.0℃和45 s,BAstV、BVDV-1、BCV和BRV的引物浓度分别为300、300、400和500 nmol·L-1,探针浓度分别为250、150、100和300 nmol·L-1。对BVDV-1、BCV和BRV的最低检测限均为102copies·μL-1,对BAstV的最低检测限为103 copies·μL-1,具有良好的特异性和重复性。该方法对临床采集的粪样的阳性检出率高于PCR方法。上述结果表明,建立的四重Real-time RT-PCR方法可以用于犊牛腹泻常见病原BAstV、BVDV-1、BCV和BRV的快速鉴别诊断。 相似文献
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BITSCH, V., N. F. FRIIS and H. V. KROGH: A microbiological study of pneumonic calf lungs. Acta vet. scand. 1976, 17, 32–42.–Fifty pneumonic calf lungs were subjected to microbiologic screening with regard to bacteria, mycoplasmas, and viruses.Of bacteria the species most commonly found were Pasteurella multocida (eight lungs), Pasteurella hemolytica (eight lungs), and Corynebacterium pyogenes (13 lungs). Of special interest was the demonstration of Neisseria spp. in five lungs. Mycoplasma dispar was found in 31 lungs, Mycoplasma bovirhinis in 16 lungs, and Urea-plasma in 26 lungs. Cytopathogenic agents were demonstrated in 14 lungs. Four isolates were found to be bovine respiratory syncytial virus, three were bovine viral diarrhea virus, and two were bovine parainfluenza 3 virus. The remaining five cytopathogenic agents were not identified. 相似文献
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牛呼吸道疾病（bovine respiratory disease,BRD）是引起舍饲牛发病和死亡的主要原因,给北美和世界养牛业造成巨大的经济损失。BRD是由多种病毒、细菌与外界环境相互作用,如应激、环境因素与多种病毒、细菌和支原体等而引起的一种严重的呼吸系统疾病。作者就引起BRD的常见和严重的病原牛传染性鼻气管炎病毒（infectious bovine rhinotracheitis virus,IBRV）和牛呼吸道合胞体病毒（bovine respiratory syncytial virus,BRSV）的生物学特性、细胞感染和致病机制等进行简要概述,以期为该病的防制和研究提供参考。 相似文献
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The objective of this study was to investigate the epidemic of three viral diarrhea diseases of yaks in northwest Sichuan province and provide certain scientific basis for controlling this kind of disease. 1070 yak serum samples from 8 counties of Aba state in northwest Sichuan province were detected by enzyme-linked immunosorbent assay (ELISA) to investigate prevalence of BVDV, BCV and BRV. The results showed that the average positive rates of BVDV, BCV and BRV antibody were 44.3%, 84.1% and 94.4%, respectively. The BVDV, BCV and BRV of yaks were widespread in northwest Sichuan province, further comprehensive prevention and control measures of viral diarrhea diseases should be strengthened in this region. 相似文献
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根据APD抗菌肽数据库报道的牛乳铁蛋白肽LfcinB氨基酸序列,合成编码LfcinB基因的2条互补的寡核苷酸链,退火后在5′端和3′端分别形成含有BamH I和Xho I位点粘性末端的双链DNA。真核表达载体pcDNA3.1（+）经BamH I 和Xho I限制性内切酶双酶切处理后与合成的LfcinB基因进行连接,连接产物转化E.coli DH5α感受态细胞,提取质粒DNA进行测序。测序结果显示,牛乳铁蛋白肽LfcinB基因成功克隆到pcDNA3.1（+）真核表达载体中,为进一步表达和抗菌活性研究奠定物质基础。 相似文献
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Mari OKAMOTO Keisuke OGUMA Nanako YAMASHITA-KAWANISHI Toshihiro ICHIJO Shinichi HATAMA Maiko ENDO Maya ISHIKAWA Takeshi HAGA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2020,82(11):1607
Bovine foamy virus (BFV) is distributed through worldwide cattle herds. Although the biological features of BFV are not well understood, appearance of clinical manifestation by superinfection with other microorganisms is inferred. In Japan, reports of genomic characterizations and epidemiology of this virus are limited. In this study, we performed whole genomic sequencing of BFV strains Ibaraki and No.43, which were isolated in this country. Additionally, we investigated BFV in geographically distant four daily farms in Japan, to estimate the distribution of BFV and its correlation to bovine leukemia virus (BLV). BFV was distributed throughout Japan; the average positive rate was 12.7%. The nucleotide sequence identities of the isolates were 99.6% when compared with BFV strain isolated in the USA. The phylogenetic tree using env gene sequence showed strains Ibaraki, No.43 and Kagoshima were sorted in the same cluster including the USA and Chinese strains, while Hokkaido strain was in the other cluster including European strains. Although no clear correlation between BFV and BLV could be found, BFV and BLV infections were likely to increase with ages. Our data on epidemiology and characteristics of BFV will provide important information to reveal biological features of BFV. 相似文献
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Mansour Aboelenain Wael B. El_domany Haitham Eldoumani Wael A. Khalil 《Reproduction in domestic animals》2020,55(8):1021-1024
Increased reactive oxygen species (ROS) generation may disrupt the oocytes function and their competence. In this study, we introduced BTZO-1, a new supplement that can regulate the oxidative stress. Addition of BTZO-1 during IVM of bovine oocytes improved their developmental competence in the term of improvement of blastocyst rates. In addition, the quality of the produced embryos was improved by decreasing the apoptosis level by showing a decreased number of TUNNEL positive cells. 相似文献
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MV Zbrun GC Zielinski HC Piscitelli C Descarga LA Urbani 《Journal of veterinary science (Suw?n-si, Korea)》2011,12(4):347-352
Infectious bovine keratoconjunctivitis (IBK) is an acute disease caused by Moraxella bovis (Mb). Several factors may predispose animals to an IBK outbreak; one commonly observed is infection with bovine herpes virus type 1 (BHV-1). The aim of this study was to investigate the dynamics of BHV-1 virus infection and its relation with clinical cases of IBK in weaned calves from a beef herd with a high prevalence of lesions caused by Mb. Sampling was carried out in six stages and included conjunctival swabs for isolating Mb as well as blood samples for identifying antibodies specific for BHV-1. A score for IBK lesions after observing each eye was determined. The findings of this study showed a high prevalence of BHV-1 virus infection (100% of animals were infected at the end of the trial); 67% of animals were culture-positive for Mb, but low rates of clinical IBK (19% of calves affected) were detected at the end of the trial. These results suggest that infection with BHV-1 did not predispose these animals to IBK, and that Mb infection produced clinical and subclinical disease in the absence of BHV-1 co-infection. 相似文献
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In order to investigate the pathogen prevalence of bovine viral diarrhea in Chongqing, this study carried out an investigation of bovine viral diarrhea virus (BVDV), bovine coronavirus (BCV), bovine rotavirus (BRV) and bovine astrovirus (BAstV) on a total of 81 diarrhea samples of beef cattle which were collected from Chongqing by RT-PCR. After the PCR products were sequenced, phylogenetic analysis was performed with Mega 6.0 software. From 81 samples, the positive rate of BRV,BAstV and BVDV were 66.7%,8.6% and 7.4%, respectively,BCV was not detected.Phylogenetic analysis showed that 5 strains of BRV sequences were clustered into a small branch, which had significant genetic distance with other VP6 sequences in GenBank; 5 strains of BVDV, Chinese and Denmark strains were clustered into one branch,genetic relationship were close; 5 strains of BAstV clustered into a branch with Hongkong strain, but there was still an obvious genetic distance. The result showed that calves under the age of half year were the main group of beef cattle with diarrhea in Chongqing. BRV was an important cause of diarrhea in Chongqing, the genetic diversity of BRV,BAstV and BVDV could be reference to further concern. 相似文献
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为了解重庆市肉牛病毒性腹泻的病原流行情况,本研究对重庆市8个肉牛养殖场的81份腹泻粪便样本中牛病毒性腹泻-黏膜病病毒（bovine viral diarrhea virus,BVDV）、牛冠状病毒（bovine coronavirus,BCV）、牛轮状病毒（bovine rotavirus,BRV）和牛星状病毒（bovine astrovirus,BAstV）4种致腹泻病毒进行了RT-PCR检测,对PCR产物进行测序,用Mega 6.0软件进行系统发育分析。结果显示,BRV、BAstV和BVDV检出率分别为66.7%、8.6%和7.4%,BCV未检出。遗传进化分析结果表明,测序的5个BRV单独聚为一小支,与GenBank中其他VP6序列有明显的遗传距离;BVDV与中国株和丹麦株聚为一支,遗传关系最近;5个BAstV单独聚为一支,与中国香港株遗传关系最近,但仍有明显的遗传距离。本试验结果表明,重庆地区肉牛腹泻主要发生在6月龄以下犊牛,BRV是该地区肉牛腹泻的重要原因,BRV、BAstV和BVDV 3种病毒的遗传多样性值得进一步关注。 相似文献
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Asuka Kumagai Kyoko Kawauchi Kiyohiko Andoh Shinichi Hatama 《Journal of veterinary diagnostic investigation》2021,33(1):162
Bovine respiratory syncytial virus (BRSV) is an etiologic agent of bovine respiratory disease. The rapid evolutionary rate of BRSV contributes to genetic and antigenic heterogeneity of field strains and causes occasional vaccine failure. We conducted molecular epidemiologic characterization of BRSV circulating in Japan to obtain genetic information for vaccine-based disease control. Phylogenetic analysis of G and F gene sequences revealed that all of the isolated Japanese BRSV strains clustered in the same genetic subgroup, which was distinct from the 9 known groups. We assigned the Japanese group to subgenotype X. The Japanese isolates formed 2 temporal clusters: isolates from 2003 to 2005 clustered in lineage A; isolates from 2017 to 2019 formed lineage B. The alignment of the deduced amino acid sequences of the G gene revealed that the central hydrophobic region responsible for viral antigenicity is conserved in all of the isolates; unique amino acid mutations were found mainly in mucin-like regions. Our results suggest that BRSV has evolved uniquely in Japan to form the new subgenotype X; the antigenic homogeneity of the viruses within this group is inferred. 相似文献
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为了检测牛呼吸道合胞体病毒(BRSV),根据已发表的融合蛋白(F)基因序列,设计了套式RT-PCR引物,初步建立了BRSV的套式RT-PCR检测方法。对138份牛鼻腔棉拭子进行了检测,结果检测到了BRSV阳性样品54份,总的阳性检出率为39.1%。对大部分BRSV阳性样品的F基因扩增产物进行了序列测定与分析。用该套式RT-PCR对牛传染性鼻气管炎病毒、牛副流感病毒3型、牛病毒性腹泻病毒等进行了检测,结果无交叉反应,表明该检测方法具有良好的特异性。本研究首次用套式RT-PCR技术证实了我国部分省的牛群中存在BRSV感染。 相似文献
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采用CHO细胞表达牛病毒性腹泻/黏膜病病毒1型（BVDV1）E2蛋白,采用杆状病毒重组表达牛病毒性腹泻/黏膜病病毒2型（BVDV2）E2蛋白,采用MDBK细胞微载体悬浮培养技术培养牛传染性鼻气管炎病毒（IBRV）和牛副流感病毒3型（BPIV3）,收获蛋白表达产物和细胞培养物,经纯化、灭活后与605佐剂混合,制备牛病毒性腹泻/黏膜病(1型+2型)、牛传染性鼻气管炎、牛副流感(3型)三联灭活疫苗(E2蛋白+C1株+HB01株)。将疫苗免疫健康易感牛进行免疫效果评价,结果表明该产品免疫效果良好,免疫牛IBRV和BPIV3中和抗体效价均可达到1∶77以上;BVDV1和BVDV2 E2蛋白琼扩抗体效价均可达到1∶32以上;免疫牛攻毒保护率均可达到4/5以上。 相似文献
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根据APD抗菌肽数据库报道的牛乳铁蛋白肽LfcinB氨基酸序列,合成编码LfcinB基因的2条互补的寡核苷酸链,退火后在5′端和3′端分别形成含有BamH I和Xho I位点粘性末端的双链DNA.真核表达载体pcDNA3.1(+)经Bam H I和Xho I限制性内切酶双酶切处理后与合成的LfcinB基因进行连接,连接产物转化E.coli DH5α感受态细胞,提取质粒DNA进行测序.测序结果显示,牛乳铁蛋白肽LfcinB基因成功克隆到pcDNA3.1(+)真核表达载体中,为进一步表达和抗菌活性研究奠定物质基础. 相似文献