共查询到20条相似文献，搜索用时 46 毫秒
1.
A plasmid, pG3BS, containing a cDNA clone from the 5' coding region of the peplomer glycoprotein gene appears to be specific for enteric transmissible gastroenteritis virus (TGEV) strains and for live-attenuated TGEV vaccines. This cDNA probe is used to differentiate porcine respiratory coronavirus (PRCV) isolates from TGEV field and vaccine strains by a slot blot hybridization assay. Probe pG3BS also hybridizes to canine coronavirus (CCV) RNA but does not hybridize to antigenically related feline infectious peritonitis virus (FIPV) RNA. The RNAs of 13 enteric TGEV isolates from the United States, Japan, and England, 4 US-licensed live-attenuated TGEV vaccines, and antigenically closely related CCV were detected by pG3BS. The RNAs of FIPV and 3 US isolates of PRCV did not react with pG3BS but were detected by a TGEV-derived plasmid, pRP3. Pigs infected with either PRCV or TGEV test serologically positive for TGEV antibody by the serum neutralization test. Characterization of the virus circulating in a swine herd by the pG3BS probe will differentiate between an enteric TGEV and a respiratory PRCV infection. 相似文献
2.
Isolation of a porcine respiratory, non-enteric coronavirus related to transmissible gastroenteritis 总被引：21，自引：0，他引：21
A porcine respiratory, non-enteric virus which is related to the coronavirus transmissible gastroenteritis virus (TGEV) has been isolated in pigs and in cell culture. The isolate was designated TLM 83. It has become very widespread and enzootic among the swine population in Belgium and in other swine raising countries. It causes an infection of the lungs and appears to spread by aerogenic route. It does not replicate in the enteric tract. The experimental infection in conventional and gnotobiotic pigs in isolation remains subclinical. The infection, either experimental or in the field, results in the formation of antibodies which neutralise the classical enteric TGEV. Based on this relationship, this virus is assumed to be a new TGEV-related porcine respiratory coronavirus or TGEV itself which has totally lost its tropism for the enteric tract. 相似文献
3.
Pigs were inoculated with various strains of transmissible gastroenteritis virus (TGEV) or with porcine respiratory coronavirus (PRCV), and antigenic site-specific antibody responses were compared. A blocking-ELISA was used to study to what extent antibodies in convalescent sera interfered with the binding of monoclonal antibodies (MAB) 57.16 or 57.110 to the attenuated TGEV/Purdue virus. Monoclonal antibody 57.16 is directed against the A site on the peplomer, neutralizes virus, and recognizes TGEV and PRCV. Monoclonal antibody 57.110 is directed against the X site on the peplomer, but does not neutralize virus, and recognizes only TGEV. Antibodies directed against TGEV and PRCV could be detected in a blocking ELISA, using MAB 57.16 as a conjugate. Antibodies directed against both viruses were detectable as early as 1 week after inoculation. Antibody titers correlated well with those in a virus-neutralization test. Antibodies against TGEV could be detected in a blocking ELISA, using MAB 57.110 as a conjugate. Such antibodies were not induced by a PRCV infection. In the blocking ELISA, using MAB 57.110 as a conjugate, antibodies were detectable as early as 2 weeks after inoculation. There was a significant difference between antibody titers reached after infection with various TGEV strains, however. This difference is ascribed to a variation of the antigenic site defined by MAB 57.110 in TGEV strains. Conditions for a differential test for TGE serodiagnosis, and for serologic discrimination between TGEV- and PRCV-infected pigs, are discussed.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
4.
Summary A porcine respiratory, non‐enteric virus which is related to the coronavirus transmissible gastroenteritus virus (TGEV) has been isolated in pigs and in cell culture. The isolate was designated TLM 83. It has become very widespread and enzootic among the swine population in Belgium and in other swine raising countries. It causes an infection of the lungs and appears to spread by aerogenic route. It does not replicate in the enteric tract. The experimental infection in conventional and gnotobiotic pigs in isolation remains subclinical. The infection, either experimental or in the field, results in the formation of antibodies which neutralise the classical enteric TGEV. Based on this relationship, this virus is assumed to be a new TGEV‐related porcine respiratory coronavirus or TGEV itself which has totally lost its tropism for the enteric tract. 相似文献
5.
A competitive ELISA which differentiates between transmissible gastroenteritis virus (TGEV) and porcine respiratory coronavirus (PRCV) was used to detect non-neutralising antibodies to the peplomer protein of TGEV in porcine sera. The test was shown to be TGEV specific, having a relative specificity of 100 per cent, and to have a relative sensitivity of 94.9 per cent when compared with the virus neutralisation test. The prevalence of TGEV in Great Britain is low; only 0.6 per cent of sows sampled in 1990 were seropositive to TGEV. Seroconversion to the virus neutralisation test occurred in a closed herd in 1984, with no apparent spread, but later testing by the ELISA did not detect any blocking antibodies. The possibility of the existence of a less contagious strain of PRCV is discussed. All British isolates of TGEV tested by the indirect fluorescent antibody test were recognised by the monoclonal antibody 1D.B12, the indicator antibody in the ELISA. 相似文献
6.
A competitive inhibition ELISA was developed to detect non-neutralizing antibodies to the peplomer protein of transmissible gastroenteritis virus (TGEV) in porcine sera using a monoclonal antibody as an indicator. It was demonstrated that field strains of the TGEV-related porcine respiratory coronavirus (PRCV) did not induce this antibody, whereas the Miller strain and field strains of TGEV did. The sensitivity of the competitive inhibition ELISA appeared to be similar to that of the virus neutralization (VN) test. The test enables differentiation of pigs which were previously infected with TGEV or PRCV and which cannot be distinguished by the classical anti-TGEV neutralization test. The present test is useful for selective serodiagnosis. 相似文献
7.
为了比较冠状病毒基因相关性,获得特异基因克隆制备冠状病毒基因芯片,根据发布的基因序列,每种病毒设计4~17对引物,利用火鸡冠状病毒(TCV)原毒和蔗糖密度梯度离心纯化浓缩的犬冠状病毒(CCV)、猫冠状病毒(FCV)、猫传染性腹膜炎病毒(FIPV)、猪传染性胃肠炎病毒(TGEV)、猪呼吸道冠状病毒(PRCV)、牛冠状病毒(BCV)细胞毒,提取总RNA并反转录和PCR扩增。回收PCR产物连接pGEM-T-easy载体并转化大肠杆菌TGI,经PCR鉴定后测序。将所有基因片段的核苷酸序列和推导的氨基酸序列,分别与GenBank有关病毒相关基因片段的核苷酸序列进行分析比较,确定它们的同源性。通过对不同冠状病毒不同基因片段的克隆和测序,发现同一群冠状病毒核苷酸序列间具有较高的同源性。 相似文献
8.
Eighteen litters of sucking piglets were challenged with one of two strains of transmissible gastroenteritis virus (TGEV). During pregnancy, their seronegative dams had been either inoculated intranasally with porcine respiratory coronavirus (PRCV), inoculated orally with TGEV or left untreated. On the basis of weight gain, clinical signs and survival, no differences in response to challenge was detected when piglets suckled by PRCV inoculated sows were compared with those suckled by uninoculated sows. Such a difference was evident when the litters of sows successfully pre-immunized with TGEV were compared with those of unicoculated or PRCV-inoculated sows. The possibility of transplacental transmission of PRCV was investigated in two litters born to sows that had been inoculated with this virus in late pregnancy. All sixteen live-born piglets were seronegative for the virus at birth and PRCV was not isolated from tissues taken from two stillborn piglets. 相似文献
9.
Use of monoclonal antibodies in blocking ELISA detection of transmissible gastroenteritis virus in faeces of piglets 总被引：4，自引：0，他引：4
Rodák L Smíd B Nevoránková Z Valícek L Smítalová R 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2005,52(3):105-111
Monoclonal antibodies (mAb) to the transmissible gastroenteritis virus (TGEV) nucleoprotein (N) and membrane protein (M) were prepared and used for the comparative assessment of three blocking ELISA variants to detect TGEV. The competitive blocking ELISA format showed the highest sensitivity, allowing detection of 10(3) TCID50 TGEV/ml in culture medium. Ninety-nine porcine field faecal samples obtained from 37 herds affected with diarrhoea were examined, and various TGEV levels were found in nine samples from six herds. However, only in three samples were significant TGEV concentrations demonstrated. The relationship between incidence of TGEV gastroenteritis and the spread of porcine respiratory coronavirus infection in pig farms is discussed. 相似文献
10.
R A Simkins P A Weilnau J Bias L J Saif 《American journal of veterinary research》1992,53(7):1253-1258
Five nonneutralizing monoclonal antibodies (MAb) generated to the virulent Miller strain of transmissible gastroenteritis virus (TGEV) and specific for the S protein were characterized. Competition assays between purified and biotinylated MAb indicated that MAb 75B10 and 8G11 mapped near a new subsite, designated V and 2 MAb, 44C11 and 45A8, mapped to a previously designated subsite D. A fifth MAb mapped between subsites V and E. These MAb were tested with 3 previously characterized MAb to subsites A, E, and F in fixed-cell ELISA and cell culture immunofluorescent assays against 5 reference and 9 field strains of TGEV and 2 US strains (ISU-1 and ISU-3) of porcine respiratory coronavirus (PRCV). Subsites A, E, and F were conserved on all TGEV and PRCV strains examined. The 2 MAb to subsite V, 8G11 and 75B10, reacted only with the Miller TGEV strains (M5C, M6, and M60), except that 75B10 also recognized field strain U328. The MAb 11H8 did not react with 4 field strains or the Purdue strains of TGEV. The 2 MAb to subsite D reacted with all TGEV strains examined, but not with 2 US PRCV strains, 2 European PRCV strains, 1 feline infectious peritonitis virus strain, and 1 canine coronavirus strain. Because of this specificity for TGEV, but not PRCV, these latter 2 subsite D MAb may be useful for the development of competition ELISA to differentiate serologically between TGEV and PRCV infections in swine, similar to the currently used European subsite D MAb. 相似文献
11.
猪腹泻是全球养猪生产中最常见的疾病之一,病毒性腹泻具有传播快、致死率高和防控难的特点。常见的引起仔猪腹泻的病毒包括猪流行性腹泻病毒(PEDV)、猪传染性胃肠炎病毒(TGEV)和猪轮状病毒(PoRV),近几年新发现的猪δ冠状病毒(PDCoV)、猪嵴病毒(PKV)和猪急性腹泻综合征冠状病毒(SADS-CoV)也与仔猪腹泻相关。病毒分离是病毒感染诊断的金标准,也是进行病毒研究的前提。对上述6种常见猪肠道病毒的分离进展进行综述,可为掌握这些病毒的分离情况、疾病发展动向监测、疫苗研发以及猪腹泻病的防控提供参考。 相似文献
12.
Susy Carman Gaylan Josephson Beverly McEwen Grant Maxie Mioara Antochi Ken Eernisse Gopi Nayar Pat Halbur Gene Erickson Ernst Nilsson 《Journal of veterinary diagnostic investigation》2002,14(2):97-105
A commercially available blocking ELISA was analyzed for its ability to identify antibodies to porcine coronaviruses (transmissible gastroenteritis virus [TGEV] or porcine respiratory coronavirus [PRCV]), to differentiate antibodies to TGEV and PRCV, and to identify TGEV-infected herds. Nine sera from uninfected pigs, 34 sera from 16 pigs experimentally infected with TGEV, and sera from 10 pigs experimentally infected with PRCV were evaluated using both the TGEV/PRCV blocking ELISA and a virus neutralization (VN) assay. The ELISA was not consistently effective in identifying pigs experimentally infected with TGEV until 21 days postinfection. Sera from 100 commercial swine herds (1,783 sera; median 15 per herd) were similarly evaluated using both tests. Thirty of these commercial herds had a clinical history of TGEV infection and a positive TGEV fluorescent antibody test recorded at necropsy within the last 35 months, while 70 herds had no history of clinical TGEV infection. The blocking ELISA and the VN showed good agreement (kappa 0.84) for the detection of porcine coronavirus antibody (TGEV or PRCV). The sensitivity (0.933) of the ELISA to identify TGEV-infected herds was good when considered on a herd basis. The ELISA was also highly specific (0.943) for the detection of TGEV-infected herds when the test results were evaluated on a herd basis. When sera from specific age groups were compared, the ELISA identified a greater proportion (0.83) of pigs in herds with TGEV antibody when suckling piglets were used. In repeatability experiments, the ELISA gave consistent results when the same sera were evaluated on different days (kappa 0.889) and when sera were evaluated before and after heating (kappa 0.888). The blocking ELISA was determined to be useful for herd monitoring programs and could be used alone without parallel use of the VN assay for the assessment of large swine populations for the detection of TGEV-infected herds. 相似文献
13.
Infection with porcine respiratory coronavirus does not fully protect pigs against intestinal transmissible gastroenteritis virus 总被引：1，自引：0，他引：1
Eight nine-week-old specific-pathogen-free pigs which had been infected with the transmissible gastroenteritis virus (TGEV)-related porcine respiratory coronavirus (PRCV) and four uninfected littermates were challenged with TGEV. The previous PRCV infection failed to protect them against the enteric TGEV infection. Virus excretion in faeces was detected by an ELISA in all the pigs for three to six consecutive days after inoculation. Although little diarrhoea was observed, the infection extended through much of the small intestine of one of the previously infected pigs four days after inoculation. Challenge with TGEV caused a secondary neutralising antibody response. By using a peroxidase conjugate of a monoclonal antibody which recognises a specific antigenic site on TGEV, antibodies against TGEV could be distinguished from antibodies against PRCV in an ELISA blocking test. 相似文献
14.
15.
采用蔗糖密度梯度离心,纯化浓缩犬冠状病毒(CCV)、猫冠状病毒(FCV)、猫传染性腹膜炎病毒(FIPV)、猪传染性胃肠炎病毒(TGEV)、猪呼吸道冠状病毒(PRCV)的细胞培养物,分别设计7,17,11,10和4对引物,构建了49个基因片段的克隆。煮沸裂解法制备质粒DNA,回收PCR扩增产物,点制冠状病毒基因芯片。抽提病毒总RNA,利用Cy3-dCTP随机渗入反转录PCR标记,与芯片进行杂交检测,淘汰交叉的克隆片段。结果表明:克隆CCV1,CCV2,CCV5和CCV7可特异诊断CCV,克隆FCV6,FCV7,FCV8和FCV9可特异诊断FCV,克隆FIPV2,FIPV7,FIPV8和FIPV9可特异诊断FIPV,克隆PRCV1,PRCV2和PRCV3可特异诊断PRCV,克隆TGEV3,TGEV4,TGEV5和TGEV6可特异诊断TGEV。将这些特异克隆扩增片段重新点制基因芯片,与病毒PCR产物杂交,未发现交叉现象。基因芯片检测比传统PCR敏感1000倍,可有效应用于这5种动物冠状病毒的检测与区分。 相似文献
16.
17.
本研究根据Genbank登录的猪传染性胃肠炎病毒(TGEV)N基因和S基因保守区序列设计合成了两对引物和探针,通过对荧光定量RT-PCR反应条件的优化,建立了TaqMan荧光定量RT-PCR快速检测TGEV的方法。该方法能有效地鉴别序列密切相关的猪传染性胃肠炎病毒与呼吸道冠状病毒。与常规RT-PCR试验比较表明,所建立的荧光RT-PCR检测技术快速、敏感,检测时限3个小时以内,具有很好的特异性和重复性。通过对39份临床样品进行检测,结果表明所建立的检测方法直接检测样品中猪传染性胃肠炎病毒。 相似文献
18.
Canine coronavirus (CCoV) and feline coronavirus (FCoV) belong to α-genus coronavirus of coronavirus family,porcine transmissible gastroenteritis virus (TGEV),porcine epidemic diarrhea virus (PEDV) also belong to the same genus.Genetic evolution analysis showed that different genotype of the virus could produce new variant strains through gene recombination,which caused great obstacles to the diagnosis and control of the disease.β-genus coronaviruses include bovine coronavirus (BCoV),canine respiratory coronavirus (CRCoV) and severe acute respiratory syndrome coronavirus (SARS-CoV).Among them,CRCoV has the highest homology with BCoV,but there are great differences in genomic structure,pathogenic mechanism and infection symptoms between this kind of coronavirus and α-coronavirus.CCoV and FCoV are widely spreading around the world,characterized by high morbidity and low mortality.Due to the characteristics of RNA virus and the influence of environmental selection pressure,the viruses continue to mutate and evolve,and new virulent strains appear one after another.The virulence of feline infectious peritonitis virus (FIPV) is greatly enhanced,some specific point mutations in the virus genome change the cellular tropism against the host.The pathogenesis of the virus mainly depends on the antibody-dependent enhancement (ADE) induced by virus infection.The epidemiological investigation and prevention and control of CCoV and FCoV should not only rely on the single factor of vaccine immunity,but also comprehensively consider the virulence of the virus,environmental conditions,pet self-immune resistance, and so on.The identification of CCoV and FCoV should be based on clinical symptoms,combined with routine hematological examination,serum biochemical examination and laboratory diagnosis techniques to prevent false positive and false negative results. 相似文献
19.
犬冠状病毒（canine coronavirus,CCoV）与猫冠状病毒（feline coronavirus,FCoV）同属于冠状病毒科冠状病毒属α属,与其同属的病毒还有猪传染性胃肠炎病毒（porcine transmissible gastroenteritis virus,TGEV）、猪流行性腹泻病毒（porcine epidemic diarrhea virus,PEDV）等。遗传进化分析表明,该种属不同基因型病毒通过基因重组能产生新型变异毒株,为疾病的诊断与防控造成了很大的阻碍。β属冠状病毒包括牛冠状病毒（bovine coronavirus,BCoV）、犬呼吸道冠状病毒（canine respiratory coronavirus,CRCoV）、严重急性呼吸综合征冠状病毒（severe acute respiratory syndrome coronavirus,SARS-CoV）等,其中CRCoV与BCoV同源性较高,该类病毒与α属冠状病毒在基因组结构、致病机制、感染症状等方面差异较大。CCoV与FCoV在全球范围内广泛传播,具有发病率高、死亡率低的特点。由于RNA病毒本身的特点和环境选择压力的影响,这两种病毒不断变异进化,新的强致病力毒株相继出现。经FCoV基因突变演化而来的猫传染性腹膜炎病毒（feline infectious peritonitis virus,FIPV）毒力大大增强,病毒基因组中某些特异性的点突变使得针对宿主的细胞嗜性发生改变,该病毒的致病机制主要依赖于病毒感染后诱导机体产生的抗体依赖性增强作用（ADE）。针对犬猫冠状病毒的流行病学调查及防控不能仅依赖于疫苗免疫单一因素,还应综合考虑病毒毒力、环境条件、宠物自身免疫抵抗力状态等。针对犬猫冠状病毒的诊断应根据临床症状,结合常规血液学检查、血清生化检查和实验室诊断技术来进行全面的鉴定,防止出现假阳性及假阴性结果。 相似文献
20.
Antibodies to a transmissible gastroenteritis virus (TGEV)-related coronavirus have been demonstrated in mink sera by indirect immunofluorescence, peroxidase-linked antibody assays and immunoblotting. This is the first serological evidence of a specific coronavirus infection in mink. The putative mink coronavirus (MCV) seems to be widespread in the Danish mink population with a prevalence approaching 100%. Analysis by immunoblotting has shown that MCV is closely related to TGEV by the spike (S), matrix (M) and nucleoprotein (N) polypeptides. Furthermore, antibodies to MCV also cross-reacted with N and M polypeptides of porcine epidemic diarrhea virus (PEDV). Thus MCV may occupy an intermediate position between the TGEV group of coronavirus and PEDV. The possibility that MCV may be associated with syndromes of acute enteritis in preweaning mink is discussed. 相似文献