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Delling C, Daugschies A. Literature Review: Coinfection in Young Ruminant Livestock- Cryptosporidium spp. and Its Companions. Pathogens 2022; 11:103. [PMID: 35056051 PMCID: PMC8777864 DOI: 10.3390/pathogens11010103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/05/2022] [Accepted: 01/10/2022] [Indexed: 02/04/2023] Open
Abstract
The protozoan Cryptosporidium parvum is one of the major causative pathogens of diarrhoea in young ruminants; therefore, it causes economic losses and impairs animal welfare. Besides C. parvum, there are many other non-infectious and infectious factors, such as rotavirus, Escherichia coli, and Giardia duodenalis, which may lead to diarrhoeic disease in young livestock. Often, more than one infectious agent is detected in affected animals. Little is known about the interactions bet-ween simultaneously occurring pathogens and their potential effects on the course of disease. In this review, a brief overview about pathogens associated with diarrhoea in young ruminants is presented. Furthermore, information about coinfections involving Cryptosporidium is provided.
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Affiliation(s)
- Cora Delling
- Institute of Parasitology, Faculty of Veterinary Medicine, Leipzig University, An den Tierkliniken 35, 04103 Leipzig, Germany;
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Castells M, Caffarena RD, Casaux ML, Schild C, Castells F, Castells D, Victoria M, Riet-Correa F, Giannitti F, Parreño V, Colina R. Detection, risk factors and molecular diversity of norovirus GIII in cattle in Uruguay. INFECTION GENETICS AND EVOLUTION 2020; 86:104613. [PMID: 33157299 DOI: 10.1016/j.meegid.2020.104613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 12/13/2022]
Abstract
Uruguay is a leading exporter of bovine meat and dairy products, and cattle production is one of the principal economic backbones in this country. A main clinical problem faced by livestock farmers is neonatal calf diarrhea (NCD); however, causes of NCD have not been extensively studied in Uruguay. Bovine norovirus (BoNoV) has been proposed as one of the possible etiologies of NCD as experimentally infected calves developed diarrhea and enteropathy, although limited information is available from field surveys. The aims of this study were to determine the frequency of infection, to investigate possible risk factors, and to determine the molecular diversity of BoNoV in Uruguay. A total of 761 samples of feces or intestinal contents from dairy and beef calves were analyzed through RT-qPCR. The overall frequency of detection of BoNoV was 66.1% with higher frequency in dairy (70.5%) than beef (15.9%) calves (p < 0.01). BoNoV was detected similarly in diarrheic (78.8%) and non-diarrheic (76.2%) dairy calves (p = 0.50). Calves ≤2 weeks of age (84%) were infected more often than older (62.7%) calves (p < 0.01). Phylogenetic analysis confirmed the presence of GIII.1 and GIII.2 genotypes. In addition, we reported the circulation of recombinant strains and the detection of a strain with the recently described novel VP1 genotype. This study represents the first report describing the circulation, the associated risk factors, and the molecular diversity of BoNoV in Uruguay.
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Affiliation(s)
- Matías Castells
- Laboratorio de Virología Molecular, CENUR Litoral Norte, Centro Universitario de Salto, Universidad de la República, Rivera 1350, 50000 Salto, Uruguay; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay.
| | - Rubén Darío Caffarena
- Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay; Facultad de Veterinaria, Universidad de la República, Alberto Lasplaces 1620, Montevideo, Uruguay
| | - María Laura Casaux
- Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay
| | - Carlos Schild
- Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay
| | - Felipe Castells
- Doctor en Veterinaria en ejercicio libre, asociado al Laboratorio de Virología Molecular, CENUR Litoral Norte, Centro Universitario de Salto, Universidad de la República, Uruguay
| | - Daniel Castells
- Centro de Investigación y Experimentación Dr. Alejandro Gallinal, Secretariado Uruguayo de la Lana, Ruta 7 km 140, Cerro Colorado, Florida, Uruguay
| | - Matías Victoria
- Laboratorio de Virología Molecular, CENUR Litoral Norte, Centro Universitario de Salto, Universidad de la República, Rivera 1350, 50000 Salto, Uruguay
| | - Franklin Riet-Correa
- Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay
| | - Federico Giannitti
- Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Ruta 50 km 11, Estación Experimental La Estanzuela, 70000 Colonia, Uruguay
| | - Viviana Parreño
- Sección de Virus Gastroentéricos, Instituto de Virología, CICV y A, INTA Castelar, Buenos Aires, Argentina
| | - Rodney Colina
- Laboratorio de Virología Molecular, CENUR Litoral Norte, Centro Universitario de Salto, Universidad de la República, Rivera 1350, 50000 Salto, Uruguay.
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Animals as Reservoir for Human Norovirus. Viruses 2019; 11:v11050478. [PMID: 31130647 PMCID: PMC6563253 DOI: 10.3390/v11050478] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 01/12/2023] Open
Abstract
Norovirus is the most common cause of non-bacterial gastroenteritis and is a burden worldwide. The increasing norovirus diversity is currently categorized into at least 10 genogroups which are further classified into more than 40 genotypes. In addition to humans, norovirus can infect a broad range of hosts including livestock, pets, and wild animals, e.g., marine mammals and bats. Little is known about norovirus infections in most non-human hosts, but the close genetic relatedness between some animal and human noroviruses coupled with lack of understanding where newly appearing human norovirus genotypes and variants are emerging from has led to the hypothesis that norovirus may not be host restricted and might be able to jump the species barrier. We have systematically reviewed the literature to describe the diversity, prevalence, and geographic distribution of noroviruses found in animals, and the pathology associated with infection. We further discuss the evidence that exists for or against interspecies transmission including surveillance data and data from in vitro and in vivo experiments.
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Norovirus Infection. EMERGING AND RE-EMERGING INFECTIOUS DISEASES OF LIVESTOCK 2017. [PMCID: PMC7122952 DOI: 10.1007/978-3-319-47426-7_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Di Felice E, Mauroy A, Pozzo FD, Thiry D, Ceci C, Di Martino B, Marsilio F, Thiry E. Bovine noroviruses: A missing component of calf diarrhoea diagnosis. Vet J 2015; 207:53-62. [PMID: 26631944 PMCID: PMC7110452 DOI: 10.1016/j.tvjl.2015.10.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 05/27/2015] [Accepted: 10/08/2015] [Indexed: 01/05/2023]
Abstract
Noroviruses are RNA viruses that belong to the Genus Norovirus, Family Caliciviridae, and infect human beings and several animal species, including cattle. Bovine norovirus infections have been detected in cattle of a range of different ages throughout the world. Currently there is no suitable cell culture system for these viruses and information on their pathogenesis is limited. Molecular and serological tests have been developed, but are complicated by the high genetic and antigenic diversity of bovine noroviruses. Bovine noroviruses can be detected frequently in faecal samples of diarrhoeic calves, either alone or in association with other common enteric pathogens, suggesting a role for these viruses in the aetiology of calf enteritis.
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Affiliation(s)
| | - Axel Mauroy
- Faculty of Veterinary Medicine and Fundamental and Applied Research on Animal and Health Center, University of Liège, B-4000 Liège, Belgium.
| | - Fabiana Dal Pozzo
- Faculty of Veterinary Medicine and Fundamental and Applied Research on Animal and Health Center, University of Liège, B-4000 Liège, Belgium
| | - Damien Thiry
- Faculty of Veterinary Medicine and Fundamental and Applied Research on Animal and Health Center, University of Liège, B-4000 Liège, Belgium
| | - Chiara Ceci
- Faculty of Veterinary Medicine, Università degli studi di Teramo, Teramo, Italy
| | - Barbara Di Martino
- Faculty of Veterinary Medicine, Università degli studi di Teramo, Teramo, Italy
| | - Fulvio Marsilio
- Faculty of Veterinary Medicine, Università degli studi di Teramo, Teramo, Italy
| | - Etienne Thiry
- Faculty of Veterinary Medicine and Fundamental and Applied Research on Animal and Health Center, University of Liège, B-4000 Liège, Belgium
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Retrospective serosurveillance of bovine norovirus (GIII.2) and nebovirus in cattle from selected feedlots and a veal calf farm in 1999 to 2001 in the United States. Arch Virol 2013; 159:83-90. [PMID: 23884635 PMCID: PMC7087015 DOI: 10.1007/s00705-013-1795-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 06/13/2013] [Indexed: 12/13/2022]
Abstract
There is a dearth of information on the seroprevalence of bovine norovirus (BoNoV) and nebovirus in cattle of the US. In this retrospective study, serum IgG antibodies to two bovine enteric caliciviruses, GIII.2 BoNoV (Bo/CV186-OH/00/US) and genetically and antigenically distinct nebovirus (Bo/NB/80/US), were evaluated in feedlot and veal calves from different regions of the US during 1999-2001. Three groups of 6- to 7-month-old feedlot calves from New Mexico (NM) (n=103), Arkansas (AR) (n=100) and Ohio (OH) (n=140) and a group of 7- to 10-day-old Ohio veal calves (n=47) were studied. Serum samples were collected pre-arrival or at arrival to the farms for the NM, AR and OH calves and 35 days after arrival for all groups for monitoring seroconversion rates during the period. Virus-like particles of Bo/CV186-OH/00/US and Bo/NB/80/US were expressed using the baculovirus expression system and were used in ELISA to measure antibodies. A high seroprevalence of 94-100 % and 78-100 % was observed for antibodies to GIII.2 BoNoV and nebovirus, respectively, in the feedlot calves tested. In the Ohio veal farm, an antibody seroprevalence of 94-100 % and 40-66 % was found for GIII.2 BoNoV and nebovirus, respectively. Increased seropositive rates of 38-85 % for GIII.2 BoNoV and 26-83 % for nebovirus were observed at 35 days after arrival and commingling on farms for all groups. Infection of calves with either GIII.2 BoNoV or nebovirus, or both viruses, appeared to be common in the regions studied in the US during 1999-2001. These two viruses likely remain endemic because no commercial vaccines are available.
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Myrmel M. Development of a strand specific SYBRGreen RT-PCR for a GIII.2 bovine norovirus. J Virol Methods 2013; 190:17-9. [PMID: 23538037 DOI: 10.1016/j.jviromet.2013.03.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 03/08/2013] [Accepted: 03/13/2013] [Indexed: 10/27/2022]
Abstract
A strand specific SYBRGreen RT-PCR was developed for a bovine norovirus (GIII.2). HEK293 cells were transfected with a plasmid containing the complete virus genome and copy DNA was produced with viral RNA strand-specific primers that introduced nucleotide changes. Amplicons from the negative and positive viral RNA strands, and from potential transcripts made by sequence independent transcription, were separated by melting curve analysis. The RT-PCR showed high strand specificity and could be a useful tool to study virus replication in replicon and reverse genetic systems and in screening for low levels of virus replication in norovirus permissive cell lines.
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Affiliation(s)
- Mette Myrmel
- Norwegian School of Veterinary Science, P.B. 8146 Dep., 0033 Oslo, Norway.
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Hirneisen KA, Kniel KE. Comparison of ELISA attachment and infectivity assays for murine norovirus. J Virol Methods 2012; 186:14-20. [DOI: 10.1016/j.jviromet.2012.07.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 07/07/2012] [Accepted: 07/11/2012] [Indexed: 10/28/2022]
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Hassine-Zaafrane M, Kaplon J, Sdiri-Loulizi K, Aouni Z, Pothier P, Aouni M, Ambert-Balay K. Molecular prevalence of bovine noroviruses and neboviruses detected in central-eastern Tunisia. Arch Virol 2012; 157:1599-604. [DOI: 10.1007/s00705-012-1344-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 04/15/2012] [Indexed: 11/29/2022]
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Infection of calves with bovine norovirus GIII.1 strain Jena virus: an experimental model to study the pathogenesis of norovirus infection. J Virol 2011; 85:12013-21. [PMID: 21880760 DOI: 10.1128/jvi.05342-11] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The experimental infection of newborn calves with bovine norovirus was used as a homologous large animal model to study the pathogenesis of norovirus infection and to determine target cells for viral replication. Six newborn calves were inoculated orally with Jena virus (JV), a bovine norovirus GIII.1 strain, and six calves served as mock-inoculated controls. Following infection, calves were euthanized before the onset of diarrhea (12 h postinoculation [hpi]), shortly after the onset of diarrhea (18 to 21 hpi), and postconvalescence (4 days pi [dpi]). Calves inoculated with JV developed severe watery diarrhea at 14 to 16 hpi, and this symptom lasted for 53.5 to 67.0 h. Intestinal lesions were characterized by severe villus atrophy together with loss and attenuation of villus epithelium. Viral capsid antigen (JV antigen) was detected by immunohistochemistry in the cytoplasm of epithelial cells on villi. In addition, granular material positive for JV antigen was detected in the lamina propria of villi. Lesions first appeared at 12 hpi and were most extensive at 18 to 19 hpi, extending from midjejunum to ileum. The intestinal mucosa had completely recovered at 4 dpi. There was no indication of systemic infection as described for norovirus infection in mice. JV was found in intestinal contents by reverse transcription-PCR (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) as early as 12 hpi. Fecal shedding of the virus started at 13 hpi and stopped at 23 hpi or at necropsy (4 dpi), respectively. Throughout the trial, none of the control calves tested positive for JV by ELISA or RT-PCR.
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Siemens N, Patenge N, Otto J, Fiedler T, Kreikemeyer B. Streptococcus pyogenes M49 plasminogen/plasmin binding facilitates keratinocyte invasion via integrin-integrin-linked kinase (ILK) pathways and protects from macrophage killing. J Biol Chem 2011; 286:21612-22. [PMID: 21521694 DOI: 10.1074/jbc.m110.202671] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The entry into epithelial cells and the prevention of primary immune responses are a prerequisite for a successful colonization and subsequent infection of the human host by Streptococcus pyogenes (group A streptococci, GAS). Here, we demonstrate that interaction of GAS with plasminogen promotes an integrin-mediated internalization of the bacteria into keratinocytes, which is independent from the serine protease activity of potentially generated plasmin. α(1)β(1)- and α(5)β(1)-integrins were identified as the major keratinocyte receptors involved in this process. Inhibition of integrin-linked kinase (ILK) expression by siRNA silencing or blocking of PI3K and Akt with specific inhibitors, reduced the GAS M49-plasminogen/plasmin-mediated invasion of keratinocytes. In addition, blocking of actin polymerization significantly reduced GAS internalization into keratinocytes. Altogether, these results provide a first model of plasminogen-mediated GAS invasion into keratinocytes. Furthermore, we demonstrate that plasminogen binding protects the bacteria against macrophage killing.
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Affiliation(s)
- Nikolai Siemens
- Institute of Medical Microbiology, Virology and Hygiene, Rostock University Hospital, Schillingallee 70, 18057 Rostock, Germany
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Rohayem J, Bergmann M, Gebhardt J, Gould E, Tucker P, Mattevi A, Unge T, Hilgenfeld R, Neyts J. Antiviral strategies to control calicivirus infections. Antiviral Res 2010; 87:162-78. [PMID: 20471996 PMCID: PMC7114105 DOI: 10.1016/j.antiviral.2010.05.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 05/01/2010] [Accepted: 05/04/2010] [Indexed: 11/29/2022]
Abstract
Caliciviridae are human or non-human pathogenic viruses with a high diversity. Some members of the Caliciviridae, i.e. human pathogenic norovirus or rabbit hemorrhagic disease virus (RHDV), are worldwide emerging pathogens. The norovirus is the major cause of viral gastroenteritis worldwide, accounting for about 85% of the outbreaks in Europe between 1995 and 2000. In the United States, 25 million cases of infection are reported each year. Since its emergence in 1984 as an agent of fatal hemorrhagic diseases in rabbits, RHDV has killed millions of rabbits and has been dispersed to all of the inhabitable continents. In view of their successful and apparently increasing emergence, the development of antiviral strategies to control infections due to these viral pathogens has now become an important issue in medicine and veterinary medicine. Antiviral strategies have to be based on an understanding of the epidemiology, transmission, clinical symptoms, viral replication and immunity to infection resulting from infection by these viruses. Here, we provide an overview of the mechanisms underlying calicivirus infection, focusing on the molecular aspects of replication in the host cell. Recent experimental data generated through an international collaboration on structural biology, virology and drug design within the European consortium VIZIER is also presented. Based on this analysis, we propose antiviral strategies that may significantly impact on the epidemiological characteristics of these highly successful viral pathogens.
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Affiliation(s)
- Jacques Rohayem
- The Calicilab, Institute of Virology, Dresden University of Technology, Dresden, Germany.
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Jor E, Myrmel M, Jonassen CM. SYBR Green based real-time RT-PCR assay for detection and genotype prediction of bovine noroviruses and assessment of clinical significance in Norway. J Virol Methods 2010; 169:1-7. [PMID: 20381534 PMCID: PMC7112832 DOI: 10.1016/j.jviromet.2010.03.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 03/17/2010] [Accepted: 03/30/2010] [Indexed: 11/25/2022]
Abstract
A novel SYBR Green based real-time RT-PCR assay for detection of genogroup III bovine noroviruses (BoNoV) was developed and the assay applied to 419 faecal samples from calves with and without diarrhoea. The samples were obtained from 190 Norwegian dairy and beef herds. BoNoV was detected in 49.6% of the samples from 61.1% of the herds indicating that BoNoV is ubiquitous in Norway. The overall prevalence was not significantly different in diarrhoea and non-diarrhoea samples. Analyses of polymerase gene sequences revealed both genotype III/1 and III/2 with genotype III/2 (Newbury2-like) being the most prevalent. Detected capsid sequences were restricted to Newbury2-like and the chimeric Bo/Thirsk10/00/UK strain. The RNA polymerase genotypes of the circulating BoNoVs in Norway were predicted by melting temperature analysis. Additional data from a challenge experiment suggest that a high proportion of young calves are shedding low levels of BoNoV for a prolonged time after recovering from the associated diarrhoea. The findings may explain some of the discrepancies in detection rates from previous studies and explain why some studies have failed to detect significant prevalence differences between calves with and without diarrhoea. It may also shed new light on some epidemiological aspects of norovirus infections.
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Affiliation(s)
- Evert Jor
- Department of Animal Health, National Veterinary Institute, PO Box 750, Sentrum, NO-0106 Oslo, Norway.
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Mauroy A, Scipioni A, Mathijs E, Saegerman C, Mast J, Bridger JC, Ziant D, Thys C, Thiry E. Epidemiological study of bovine norovirus infection by RT-PCR and a VLP-based antibody ELISA. Vet Microbiol 2009; 137:243-51. [PMID: 19232845 PMCID: PMC7117358 DOI: 10.1016/j.vetmic.2009.01.031] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Revised: 01/16/2009] [Accepted: 01/21/2009] [Indexed: 01/10/2023]
Abstract
Noroviruses, belonging to the family Caliciviridae, have been identified in human beings and in several animal species including cattle. The distribution of bovine norovirus infections was investigated by both RT-PCR to detect norovirus genomes and a virus-like particles-based ELISA to detect genotype 2 bovine norovirus antibodies. During a 1-year systematic study, a virus prevalence of 7.5% (CI 95%: [3.7; 13.4%]) (10 out of 133 samples) was found in stool samples from diarrhoeic calves screened by RT-PCR. Nucleotide sequencing performed on the polymerase region classified all the norovirus amplicons in the bovine norovirus genotype 2. Rather surprisingly, some rotavirus sequences were also detected. On the basis of the polymerase region, genotype 1 bovine norovirus was not identified. Other enteropathogens were found in all samples. By ELISA, a genotype 2 seroprevalence of 93.2% (CI 95%: [90.4; 95.3%]) was found from calves and adult cattle. Antibody levels against genotype 2 bovine noroviruses rose in the first 6 months of life and were maintained in adults. Together the results of virus prevalence and seroprevalence studies suggest that bovine norovirus infection occurs early in life and that re-infection with serologically related bovine noroviruses strains could occur in adult cattle as reported for rotaviruses. The antibody rise against genotype 2 bovine noroviruses in the adult cattle also suggests a short lived and/or strain specific immunity as already shown in human noroviruses. Genotype 2 bovine noroviruses are endemic in the region investigated.
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Affiliation(s)
- Axel Mauroy
- Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, B-4000 Liège, Belgium
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Self-assembly of the recombinant capsid protein of a swine norovirus into virus-like particles and evaluation of monoclonal antibodies cross-reactive with a human strain from genogroup II. J Clin Microbiol 2008; 46:3971-9. [PMID: 18842943 DOI: 10.1128/jcm.01204-08] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Noroviruses (NoVs) are responsible for the majority of gastroenteritis outbreaks in humans. Recently, NoV strains which are genetically closely related to human genogroup II (GII) NoVs have been detected in fecal specimens from swine. These findings have raised concern about the possible role of pigs as reservoirs for NoVs that could infect humans. To better understand the epidemiology of swine NoVs in both the swine and the human populations, rapid immunoassays are needed. In this study, baculovirus recombinants were generated to express the capsid gene of a swine NoV GII genotype 11 (GII.11) strain which self-assembled into virus-like particles (VLPs). Subsequently, the purified VLPs were used to evoke monoclonal antibodies (MAbs) in mice. A panel of eight promising MAbs was obtained and evaluated for their ability to bind to heterologous VLPs, denaturated antigens, and truncated capsid proteins. The MAbs could be classified into two groups: two MAbs that recognized linear epitopes located at the amino-terminal half (shell domain) of the swine NoV GII.11 VLPs and that cross-reacted with human GII.4 NoV VLPs. The other six MAbs bound to conformational epitopes and did not cross-react with the human GII.4 VLPs. To our knowledge, this is the first report on the characterization of MAbs against swine NoVs. The swine NoV VLPs and the MAbs described here may be further used for the design of diagnostic reagents that could help increase our knowledge of the prevalence of NoV infections in pigs and the possible role of pigs as reservoirs for NoVs.
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