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Bovine coronavirus (BCoV) is an important cause of diarrhoea in calves, winter dysentery in adult cattle and respiratory tract disease in feedlot cattle. Serum, faecal and nasal swab samples were collected from a total of 96 cattle with clinical signs in 29 barns of 23 villages in Northwestern Turkey. The cattle were subdivided into 3 distinct age groups (0-30 days old, 4-12 months old and 2-7 years old). An indirect antigen-capture ELISA and an antibody-detection ELISA as well as geometric mean BCoV antibody titres were used to detect BoCV shed in the faeces and in the nasal secretions, respectively. Relationships between BCoV shedding and age group, seroconversion and clinical signs in cattle were also analysed. The rate of faecal shedding of BoCV was 37.1% (13/35) in 0-30 days old calves, 25.6% (10/39) in 4-12 months old feedlot cattle and 18.2% (4/22) in 2-7 years old cows. The overall rate of BCoV faecal shedding was 28.1% (27/96) in the cattle examined. Only one animal in the 4-12 months old age group was found to shed BoCV nasally. The analysis showed that there was a significant difference (P < 0.0001) with respect to faecal shedding between the clinical signs and the age groups. BCoV antibody titre in 50% of all cattle was < or =100 as detected by ELISA while 27.1% of the cattle had high titres ranging between 1,600 and 25,600. The seroconversion rate was 7.3% (7/96) in animals shedding BoCV in the faeces and 42.7% (41/96) in cattle negative for faecal shedding as detected by ELISA, and 20.8% of cattle with no seroconversion shed BCoV in the faeces. There was no statistically significant association between seroconversion and nasal or faecal BCoV shedding. These findings confirm the presence of BCoV infections in Turkey. Further studies are needed to isolate BCoV strains in Turkey and to investigate their antigenic and genetic properties. 相似文献
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Although the widespread occurrence of calf diarrhoea (CD) bovine coronavirus (BCoV) infections have been reported in most cattle producing countries, only the genetic differences in the BCoVs from American and Canadian isolates and/or strains have been identified and compared. Hence, it is unclear if the BCoVs circulating in the other countries have distinct genetic characteristics. The aim of this study was to determine the prevalence and genetic diversity of CD BCoVs based on the deduced amino acid (aa) sequences of the spike (S) and haemagglutinin/esterase (HE) proteins in South Korea. RT-PCR and nested PCR using the primer pairs specific to the nucleocapsid gene, BCoVs detected the BCoVs in 56 (15.6%) of 359 diarrhoeic faecal samples. Phylogenetic analysis of the entire S gene indicated that 10 Korean CD BCoV strains clustered with other Korean BCoV strains with different clinical forms but were different from the American and Canadian BCoV strains. Moreover, the phylogenetic data of the aa sequences of the HE gene revealed all the Korean CD strains to be distinct from the other Korean BCoV strains with different clinical forms. These results suggest that the Korean BCoVs cause endemic infections in diarrhoeic calves in Jeonnam province and have taken a different evolutionary pathway from the BCoVs in other countries. Moreover, the different BCoV strains are circulating in the different clinical forms in South Korea. These results also suggest that vaccines against the BCoVs can be developed with each Korean BCoV in different clinical forms. 相似文献
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旨在全面了解牛冠状病毒(BCoV)在吉林省肉牛群的流行情况,选择吉林省东中西部地区的12个县市的规模化、养殖合作社、家庭型养殖户等牛场在不同季节采集血液、鼻拭子、粪拭子及临床病死牛组织脏器,采用血清学及分子生物学诊断检测技术,对BCoV进行流行病学调查,了解BCoV在该吉林省部分地区的流行情况。共采集临床血清样品1 298份,粪便样品、肝、肺、脾、气管等组织样品462份,应用商品化BCoV抗体检测试剂盒检测血清抗体和纳米PCR新型检测技术对临床样品进行PCR检测,并对核酸检测出的阳性结果测序分析。结果显示BCoV抗体血清阳性率为1.08%,粪便、肝等临床样品阳性率21.10%。经测序分析调查地区BCoV流行株与我国四川流行株相似性达99%以上。本研究对吉林省中部地区BCoV流行情况进行了全面调查,丰富了牛冠状病毒的流行病学调查数据,为指导牛冠状病毒的防控工作奠定了基础。 相似文献
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Danilo T. Stipp Aline F. Barry Alice F. Alfieri Elisabete Takiuchi Alexandre M. Amude Amauri A. Alfieri 《Tropical animal health and production》2009,41(7):1563-1567
Bovine coronavirus (BCoV) is one of the main causes of neonatal calf diarrhoea. Several diagnostic assays have been employed
to detect the presence of the virus in stool samples from calves. Despite this, the frequency of BCoV infection among Brazilian
and even South American cattle herds has yet to be well characterised. This study describes the occurrence of BCoV infection
among calves from dairy and beef herds in four Brazilian states. A total of 282 stool samples from 1 to 60-day-old calves
were evaluated for the presence of BCoV by a semi-nested (SN) PCR assay. The animals were from herds (n = 23) located in three geographical regions in Brazil (south, southeast, and center-west). The specific BCoV amplicon was
detected in 15.6% (44/282) of the faecal specimens examined, of which 95.4% (42/44) were from diarrhoeic and 4.6% (2/44) from
asymptomatic calves. The specificity of the SN-PCR amplicons was evaluated by restriction fragment length polymorphism (RFLP)
analysis. The results show that the BCoV is widespread, mainly among calves from 16 to 30-days-old (p = 0.0023), and verify the association between BCoV infection and clinical signs of diarrhoea (p = 0.005). These findings emphasise the importance of this virus in enteric infections of Brazilian cattle herds. 相似文献
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Zhu W Dong J Haga T Goto Y Sueyoshi M 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2011,73(4):531-534
Bovine coronavirus (BCoV) and group A bovine rotavirus (BRV) are two of major causes for neonatal calf diarrhea. In the present study, a one-step duplex RT-PCR was established to detect and differentiate BCoV and group A BRV from fecal samples. The sensitivity of this method for BCoV and group A BRV was 10 PFU/100 μl and 1 PFU/100 μl, respectively. Twenty-eight diarrhea fecal samples were detected with this method, the result showed that 2 samples were identified as co-infected with BCoV and group A BRV, 26 samples were group A BRV positive, and 2 samples were negative. It proved that this method is sensitive for clinical fecal samples and is worth applying to laboratory diagnosis for BCoV and group A BRV. 相似文献
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Kaneshima T Hohdatsu T Hagino R Hosoya S Nojiri Y Murata M Takano T Tanabe M Tsunemitsu H Koyama H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2007,69(3):301-303
Canine respiratory coronavirus (CRCoV), which is more closely related to the bovine coronavirus (BCoV), has recently been detected in dogs. In this study, we examined whether BCoV was capable of infecting and exhibiting pathogenicity in dogs. Three 1-month-old pups were oronasally given field isolates of BCoV, and were kept together with 2 control animals. As a result, increases in BCoV-neutralizing antibody titers were confirmed in all pups in the challenged and control groups. Moreover, the virus gene was also detected in oral and rectal swabs by RT-PCR. These results indicate that BCoV infects dogs, and easily infects other dogs that are kept together. However, no clinical symptoms such as respiratory symptoms and diarrhea were observed. 相似文献
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为建立牛病毒性腹泻病毒(BVDV)、牛轮状病毒(BRV)和牛冠状病毒(BCoV)的快速检测方法,根据GenBank中登录的BVDV 5'-UTR、BRV NSP5和BCoV N基因序列设计特异性引物和探针,通过优化反应体系和条件,建立了同时检测上述3种病毒的TaqMan三重RT-qPCR方法。该方法仅对BVDV 5'-UTR、BRV NSP5和BCoV N基因扩增呈阳性,而对牛传染性鼻气管炎病毒、牛副流感病毒、魏氏梭菌(A型、B型和D型)、多杀性巴氏杆菌(A型和B型)等犊牛腹泻相关病原扩增均呈阴性;最低检出限为10拷贝/μL;组内和组间变异系数均小于2%。利用本研究建立的TaqMan三重RT-qPCR方法对29份临床样品进行检测,获得BVDV、BRV、BCoV的4种混合感染型,其中BVDV与BCoV的混合感染率最高(27.6%);与已有单重RT-qPCR方法比较,发现两种方法检测BVDV、BRV和BCoV的符合率分别为100%、96.5%、100%。结果表明,本研究建立的TaqMan三重RT-qPCR方法具有特异性强、敏感性高、重复性好、可行性高等优点,可为今后BVDV、BRV和BCoV共感染引起的牛腹泻性疾病的鉴别诊断和流行病学调查提供新技术手段。 相似文献
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Severe outbreak of bovine coronavirus infection in dairy cattle during the warmer season 总被引：2，自引：0，他引：2
Decaro N Mari V Desario C Campolo M Elia G Martella V Greco G Cirone F Colaianni ML Cordioli P Buonavoglia C 《Veterinary microbiology》2008,126(1-3):30-39
A severe outbreak of enteric and respiratory disease associated with bovine coronavirus (BCoV) infection is described. The outbreak occurred in a dairy herd of southern Italy in the first decade of September 2006, when summer temperatures were still recorded, affecting calves, heifers and adult cows, with a marked decrease in milk production. By virus isolation and RT-PCR targeting the S gene, BCoV was identified as the etiological agent of the outbreak, whereas bacteriological, parasitological and toxicological investigations failed to detect other causes of disease. BCoV strains with 99-100% nucleotide identity in the S gene were isolated from nasal, ocular and rectal swabs, thus proving the absence of separate clusters of virus on the basis of tissue tropism. Sequence analysis of the haemagglutination-esterase and spike proteins of the strain detected in one rectal sample (339/06) showed a high genetic relatedness with recent BCoV isolates (98-99% amino acid identity), with several unique amino acid substitutions in the S protein. The BCoV outbreak described in this paper presents interesting aspects: (i) the occurrence of a severe form of disease in the warmer season; (ii) the simultaneous presence of respiratory and enteric disease; (iii) the involvement of young as well as adult cattle. 相似文献
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Hägglund S Svensson C Emanuelson U Valarcher JF Alenius S 《Veterinary journal (London, England : 1997)》2006,172(2):320-328
The dynamics of bovine respiratory syncytial virus (BRSV), bovine parainfluenza virus 3 (PIV-3), bovine corona virus (BCoV) and bovine viral diarrhoea virus (BVDV) infections were studied in 118 dairy herds in south western Sweden. By using serology on paired samples from three approximately 7 vs. approximately 15-month-old calves per herd, the propagation of infections was investigated over about a 1-year period. The results implied that at least 74% of calves had experienced one or more of the monitored infections at the age of approximately 7 months (Sample 1, Spring); 30%, 48%, 34% and 8% were seropositive to BRSV, PIV-3, BCoV and BVDV, respectively. Seroconversions to BRSV, PIV-3, BCoV and BVDV occurred in 26%, 38%, 50% and 3% of seronegative animals and 63% had antibodies against two or more infections at approximately 15 months (Sample 2). In total, 90-97% of animals that were seropositive in Sample 1 remained positive in Sample 2. A significant association was found between BVDV and BCoV (P = 0.01). Moreover, a significantly higher proportion of herds in which no calves had a recorded history of respiratory disease (n = 15) were classified as negative to all four infections monitored when compared to herds in which disease was observed (P = 0.0002). This study showed a high infection burden in young animals and effective spread of BRSV, PIV-3 and BCoV in one area of Sweden. BVDV infections were restricted to a few herds, reflecting the effect of a voluntary control program against BVDV in Sweden. 相似文献
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辽宁省某奶牛养殖场10～30日龄犊牛发生腹泻,为查明病因,我们对送检的18份犊牛腹泻样本分别进行牛轮状病毒(BRV)、牛冠状病毒(BCoV)、牛病毒性腹泻病毒(BVDV)、产肠毒素大肠杆菌(ETEC)、沙门氏菌(Salmonella)和安氏隐孢子虫(C. andersoni)的PCR检测。结果显示:18份犊牛腹泻样本中,BRV、BCoV、BVDV的检出率分别为83.3%(15/18)、88.9%(16/18)、61.1%(11/18),这3种病原的混合感染率较高,其他病原均未检出,说明该奶牛场的犊牛腹泻主要由BRV、BCoV、BVDV混合感染引起。 相似文献
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E. L. Goodrich L. D. Mittel A. Glaser S. L. Ness R. M. Radcliffe T. J. Divers 《Equine Veterinary Education》2020,32(3):150-154
This case report describes an outbreak and novel findings associated with a beta coronavirus (BCoV) infection that occurred on an American Miniature Horse (AMH) breeding farm in upstate New York, in January and February of 2013. Twenty-nine AMH and one donkey were present on the farm when the outbreak occurred. One 10-year-old Quarter Horse mare, stabled at a separate location and owned by an employee of the farm, also tested positive. A polymerase chain reaction (PCR) assay for the detection of BCoV was performed at the Animal Health Diagnostic Center (AHDC) at Cornell on all faecal samples. The PCR assay used detects multiple beta coronaviruses, including, but not limited to, equine enteric coronavirus (ECoV). Novel findings regarding this BCoV infection in horses were recognised in this outbreak study. To the authors’ knowledge, this is the largest outbreak of BCoV described thus far in a closed herd on a single premise. The case fatality rate was 0% unlike that described in a previous outbreak of ECoV involving miniature horses and a miniature donkey (Fielding et al. 2015). The morbidity rate was lower in this outbreak than in previously described studies (Oue et al. 2013; Pusterla et al. 2013). This outbreak also demonstrated the potential for BCoV transmission via farm personnel. The duration of shedding of virus in the faeces among some asymptomatic horses in this outbreak was longer than previously described clinical cases of ECoV (Pusterla et al. 2013; Nemoto et al. 2014). This study suggests that asymptomatic animals may play a role in the maintenance of BCoV during an outbreak; therefore, the need for diagnostic testing of both clinically affected and apparently clinically normal horses on a premises followed by appropriate biosecurity and control measures. 相似文献
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【目的】 调查新疆喀什地区安格斯犊牛腹泻主要病毒性病原流行情况及牛诺如病毒（Bovine norovirus,BNoV）全基因组遗传关系。【方法】 采用RT-PCR技术分别对2021年不同季节在喀什4个牛场采集的363份犊牛腹泻粪便样品进行牛轮状病毒（Bovine rotavirus,BRV）、牛冠状病毒（Bovine coronavirus,BCoV）、牛病毒性腹泻病毒（Bovine viral diarrhea virus,BVDV）和BNoV 4种病毒性病原检测,并对扩增获得的BNoV全基因序列进行分析。【结果】 BCoV和BNoV检出率较高,分别为36.09%（131/363）和25.07%（91/363）,混合感染中BCoV＋BNoV检出数量最多,阳性率为44.00%（22/50）。对喀什地区4个场区进行检测,其中A场主要检测出BCoV和BNoV,检出率分别为43.52%（47/108）和32.41%（35/108）;B场主要检测到BCoV,检出率为52.21%（71/136）;C、D场病原检出率普遍较低。秋、冬季检出量最多的病毒分别为BNoV和BCoV,检出率分别为66.67%（50/75）和77.59%（90/116）。对BNoV全基因序列分析显示,本试验检测到的新疆喀什地区BNoV Bo/XJ-KS/01/CHN株（登录号：ON076888）属于GⅢ.2型BNoV,与中国CN/HB-SJZ和CH/HB/BD/2019毒株在进化树中处于同一分支,且与CN/HB-SJZ-2毒株核苷酸相似性最高,为93.70%;与英国分离到的Jena/1999/UK毒株核苷酸相似性最低,为72.49%。进一步对3个开放阅读框（ORF）比对分析发现,测得的BNoV全基因组序列与国内参考株CN/HB-SJZ-2的核苷酸和氨基酸相似性主要是在ORF1区域最高,分别为94.24%和98.69%;与国外参考株Jena/1999/UK的核苷酸和氨基酸相似性主要是在ORF3区域最低,分别为63.59%和64.57%。与国内外毒株比对结果显示,未出现基因重组现象。【结论】 南疆地区犊牛腹泻流行情况因季节、场区不同有一定的差异。病毒性病原主要在秋、冬季感染率较高,以单一BCoV、BRV和BNoV感染为主。本研究测定分析的BNoV GⅢ.2型Bo/XJ-KS/01/CHN全基因序列与中国CN/HB-SJZ-2参考株亲缘关系最近,与国内外全基因组参考序列比对未出现基因重组现象。 相似文献
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Alfieri Amauri Alcindo Ribeiro Juliane de Carvalho Balbo Luciana Lorenzetti Elis Alfieri Alice Fernandes 《Tropical animal health and production》2018,50(8):1937-1940
Dairy calf rearing unit is a management system that is only recently being implemented by some milk producer’s cooperatives in southern Brazil. However, aspects related to the health profile of the heifer calves that arrive in the rearing unit as well as about biosecurity practices and microbiological challenges have not yet been evaluated in this rearing system in a tropical country. Diarrhea is the main and most frequent consequence of enteric infections in newborn calves. This study, through some etiological and epidemiological characteristics of an outbreak of neonatal diarrhea, has the aim to alert to the possibility of pathogenic microorganism spread in a dairy heifer calf rearing unit. The diarrhea outbreak presented some non-regular characteristics observed in bovine coronavirus (BCoV) enteric infections in dairy calves. The spread of infection was extremely rapid (1 week); the attack rate (>?50%) was much higher than that observed in calves subjected to conventional rearing; and the age range (5 to 90 days) of the affected heifer calves was much broader than that often observed in the BCoV diarrhea worldwide. These unusual epidemiological characteristics observed in this BCoV diarrhea outbreak raise awareness of the health threat present in calf rearing units as well as of the easy and rapid viral spread in a population of young animals from different dairy herds and, therefore, with very distinct immunological status.
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Yang DK Hwang IJ Kim BH Kweon CH Lee KW Kang MI Lee CS Cho KO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(9):977-979
A total of 804 goat sera were collected from 144 goat farms in five regions of South Korea during a period between 2005 and 2006 and screened for the antibodies of viral pathogens in ruminants. The individual seropositive rates for each virus were 13.7% (110/804) for bovine herpesvirus-1 (BHV-1), 9.5% (76/804) for bovine parainfluenza type-3 virus (PI-3V), 5.5% (44/804) for Akabane virus (AKAV), 13.3% (107/804) for Aino virus (AINV), 2.0% (16/804) for Chuzan virus (CHUV) and 1.0% (8/804) for bovine coronavirus (BCoV). Compared with other areas, Chungcheong Province showed higher seropositive rates of 13.6% for PI-3V, 22.3% for AKAV and 28.2% for AINV. The results indicate that among the six viral diseases, BHV-1 infection is quite prevalent, while BCoV infection is less prevalent on domestic goat farms in Gyeongsang and Jeonla Provinces. 相似文献
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Iglseder A Franz S Benetka V Möstl K Latif M Walk K Baumgartner W 《Schweizer Archiv für Tierheilkunde》2011,153(10):441-447
Enzootic bronchopneumonia (EBP) is an infectious, multifactorial respiratory disease of cattle. Different viruses may be involved in its pathogenesis. In this study an adapted method of endoscopic bronchoalveolar lavage (BAL) of caudal parts of the right cranial lung lobe was established and evaluated. The obtained bronchoalveolar lavage fluid (BALF) served as template for the detection of BRSV, BPIV-3 and BCoV specific nucleic acids by RT-PCR. BALF samples of 44 cattle affected with respiratory disease were compared to nasal swabs in their reliability to detect the causative agent(s). In 6/7 animals tested positive for BRSV, RNA of this virus was detected in the BALF, in 4 animals it could be found in the nasal swabs. In two of the three BPIV-3 positive animals, the BALF was the only material that tested positive. The most reliable samples for detection of 15 BCoV positive animals were the nasal swabs. BAL was easy to perform, it led to severe coughing in one case and moderate worsening of dyspnoe in three cases. In conclusion this study shows that BAL of the right cranial lung lobe is in many cases the only tool to detect BRSV and BPIV-3, major viral triggers of EBP. 相似文献