1
|
Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Chang HW, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of neutralizing epitopes on the D/A domain of the E2 glycoprotein of classical swine fever virus. Virus Res 2023; 336:199209. [PMID: 37633596 PMCID: PMC10485151 DOI: 10.1016/j.virusres.2023.199209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/19/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Classical swine fever virus (CSFV) shares high antigenic homology with other members of the genus Pestivirus. Because several pestivirus species can also infect swine, eliciting cross-reactive antibodies, it is important to define CSFV-specific epitopes for the differential diagnosis of classical swine fever (CSF) by serology. For this purpose, epitope mapping of seven monoclonal antibodies (mAbs), recognizing sites on the D/A domain of glycoprotein E2, was performed using recombinant expressed antigenic domains and mutants of E2, as well as an overlapping peptide library. Three CSFV-specific epitopes, i.e., 780-IEEMGDDFGFGLCPF-794, 810-NGSAFYLVCPIGWTG-824, and 846-REKPF-850, were identified within the D/A domain of E2. Site-directed mutagenesis further confirmed that residues 783-MGD-785, 789-FGLCPF-794, 813-AFYLVCPIGWTG-824, and 846-REK-848 were critical residues in these regions. In addition, a F789S difference within the epitope 780-IEEMGDDFGFGLCPF-794 was responsible for the absence of binding of two mAbs to the E2 protein of the live attenuated CSFV vaccine strain Riems. Structural modeling revealed that, the three epitopes are located near each other, suggesting that they may form a more complex conformational epitope on the D/A domain in vivo. Six of the mAbs neutralized viruses of diverse genotypes, indicating that the target epitopes are involved in virus interaction with cells. The binding of CSFV to cells was significantly reduced after pre-incubation with either truncated E2 proteins comprising the D/A domain or with the CSFV-specific mAbs targeting the domain D/A. These epitopes identified on the D/A domain are important targets for virus neutralization that might be involved in the early steps of CSFV infection. These findings reveal potential candidates for improving the differential diagnosis of pestiviruses by serology.
Collapse
Affiliation(s)
- Yu-Liang Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Denise Meyer
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Alexander Postel
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Kuo-Jung Tsai
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hsin-Meng Liu
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Chia-Huei Yang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Yu-Chun Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hui-Wen Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Ming-Chung Deng
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Paul Becher
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Helen Crooke
- WOAH Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw, Surrey, KT15 3NB, UK.
| | - Chia-Yi Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
| |
Collapse
|
2
|
Bouzalas IG, Gelasakis AI, Chassalevris T, Apostolidi ED, Pappas F, Ekateriniadou L, Boukouvala E, Zdragas A. Circulation of Pestiviruses in Small Ruminants from Greece: First Molecular Identification of Border Disease Virus. Vaccines (Basel) 2023; 11:vaccines11050918. [PMID: 37243022 DOI: 10.3390/vaccines11050918] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/13/2023] [Accepted: 04/27/2023] [Indexed: 05/28/2023] Open
Abstract
The incidence of small ruminant pestivirus infections in Greece remains unknown as they have not been diagnosed in the country since 1974 when the most recent Border Disease Virus (BDV) outbreak was reported. The objective of our study was to explore the possible occurrence of pestiviral infections among sheep and goat farms in Greece and to further determine the variants of major concern. Thus, serum samples were collected from 470 randomly selected animals belonging to 28 different flocks/herds. ELISA on p80 antibody revealed the existence of seropositive animals in four out of the 24 studied sheep flocks, whereas all the goats in the four studied herds were seronegative. Viral RNA and antigens were detected in two sheep out of the four seropositive flocks by RT-PCR and ELISA, respectively. Sequencing and phylogenetic analysis showed that the newly identified Greek variants were closely related to the strains of the BDV-4 genotype. One of the BDV-positive sheep demonstrated the diagnostic profile of a persistently infected (PI) animal, providing additional information regarding the source of the infection. This is the first molecular identification of BDV isolates in Greece. Our findings indicate that BDV infections are likely to remain undiagnosed, highlighting the need for further epidemiological studies and active surveillance programs to determine the prevalence and impact of BDV infections on a countrywide level.
Collapse
Affiliation(s)
- Ilias G Bouzalas
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Athanasios I Gelasakis
- Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Taxiarchis Chassalevris
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Evangelia D Apostolidi
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Fotis Pappas
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Loukia Ekateriniadou
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Evridiki Boukouvala
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| | - Antonios Zdragas
- Veterinary Research Institute, Hellenic Agricultural Organization DIMITRA (ELGO-DIMITRA), Campus Thermi, 57001 Thessaloniki, Greece
| |
Collapse
|
3
|
HoBi-like Pestivirus Is Highly Prevalent in Cattle Herds in the Amazon Region (Northern Brazil). Viruses 2023; 15:v15020453. [PMID: 36851667 PMCID: PMC9965828 DOI: 10.3390/v15020453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 01/23/2023] [Accepted: 01/30/2023] [Indexed: 02/09/2023] Open
Abstract
Pestiviruses are globally distributed and cause substantial economic losses to the cattle industry. In Brazil, the country with the world's largest cattle population, pestivirus infections are well described in some regions, such as in the south, where a high frequency of BVDV-2 is described and contrasts with the high prevalence of HoBi-like pestivirus (HoBiPeV) in the northeast. However, there is a lack of information about pestiviruses in the Amazon Region, in northern Brazil, with a cattle population estimated at 55.7 million head, which has a significant impact on the international livestock market. Therefore, this study investigated the seroprevalence and genetic variability of ruminant pestiviruses in 944 bovine serum samples from four states in northern Brazil: Pará (PA), Amapá (AP), Roraima (RR), and Amazonas (AM). Our results showed that 45.4% of the samples were seropositive (19.8% for BVDV-1, 14.1% for BVDV-2, and 20.9% for HoBiPeV). All samples were tested by RT-qPCR, and three were positive and classified as HoBiPeV in a phylogenetic analysis. These serological and molecular results contrast with those from other regions of the world, suggesting that the northern Brazilian states have a high prevalence of all bovine pestiviruses including HoBiPeV.
Collapse
|
4
|
Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Berkley N, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of a Common Conformational Epitope on the Glycoprotein E2 of Classical Swine Fever Virus and Border Disease Virus. Viruses 2021; 13:v13081655. [PMID: 34452520 PMCID: PMC8402670 DOI: 10.3390/v13081655] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 12/13/2022] Open
Abstract
Classical swine fever virus (CSFV) shares high structural and antigenic homology with bovine viral diarrhea virus (BVDV) and border disease virus (BDV). Because all three viruses can infect swine and elicit cross-reactive antibodies, it is necessary to differentiate among them with regard to serological diagnosis of classical swine fever. To understand the mechanism of cross-reactivity, it is important to define common or specific epitopes of these viruses. For this purpose, epitope mapping of six monoclonal antibodies (mAbs) was performed using recombinant expressed antigenic domains of CSFV and BDV E2 proteins. One CSFV-specific conformational epitope and one CSFV and BDV common epitope within domain B/C of E2 were identified. Site-directed mutagenesis confirmed that residues G725 and V738/I738 of the CSFV-specific epitope and P709/L709 and E713 of the second epitope are important for mAbs binding. Infection of CSFV in porcine cells was significantly reduced after pre-incubation of the cells with the domain B/C of E2 or after pre-incubation of CSFV with the mAbs detecting domain B/C. 3D structural modeling suggested that both epitopes are exposed on the surface of E2. Based on this, the identified epitopes represent a potential target for virus neutralization and might be involved in the early steps of CSFV infection.
Collapse
Affiliation(s)
- Yu-Liang Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Denise Meyer
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Alexander Postel
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Kuo-Jung Tsai
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Hsin-Meng Liu
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Chia-Huei Yang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Yu-Chun Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Nicholas Berkley
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
| | - Ming-Chung Deng
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan;
| | - Paul Becher
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Helen Crooke
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
| | - Chia-Yi Chang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
| |
Collapse
|
5
|
Multivariate analysis as a method to evaluate antigenic relationships between BVDV vaccine and field strains. Vaccine 2020; 38:5764-5772. [PMID: 32690424 DOI: 10.1016/j.vaccine.2020.07.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/29/2020] [Accepted: 07/06/2020] [Indexed: 02/08/2023]
Abstract
Bovine viral diarrhea virus (BVDV) is comprised of two species, BVDV-1 and BVDV-2, but given the genetic diversity among pestiviruses, at least 21 subgenotypes are described for BVDV-1 and 4 for BVDV-2. Genetic characterization can be achieved through complete or partial sequencing and phylogeny, but antigenic characterization can be difficult to determine due to the antigenic diversity and cross-neutralization that exists among isolates. The traditional method for evaluating antigenic relationships between pestivirus isolates is the virus neutralization (VN) assay, but interpretation of the data to determine antigenic difference can be unclear. Data from this study utilized a multivariate analysis for visualization of VN results to analyze the antigenic relationships between vaccine strains and multiple field isolates. Polyclonal sera were generated against 6 BVDV strains currently contained in vaccine formulations, and each serum was used in VN's to measure the neutralizing antibody titers against 15 BVDV field isolates characterized as prevalent and divergent subgenotypes in the USA. Principal component analysis (PCA) were performed on the VN assay datasets, and results were interpreted from PCA clustering within the PCA dendrogram and scatter plot. The results demonstrated clustering patterns among isolates suggestive of antigenic differences. While expected, the BVDV-1 and BVDV-2 isolates did not cluster together and had the greatest spatial distribution. In addition, other BVDV isolates had distinct spatial patterns suggesting antigenically divergent isolates. This analysis provides an alternative and more efficient means to analyze large VN datasets to visualize antigenic relationships between pestivirus isolates. This analysis could be beneficial for vaccine development and evaluation of efficacy, since most vaccines cannot fully protect animals from the broad range diversity of BVDV viruses.
Collapse
|
6
|
Mirosław P, Polak MP. Variability of E2 protein-coding sequences of bovine viral diarrhea virus in Polish cattle. Virus Genes 2020; 56:515-521. [PMID: 32300930 PMCID: PMC7329765 DOI: 10.1007/s11262-020-01756-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 04/03/2020] [Indexed: 11/29/2022]
Abstract
Bovine viral diarrhea virus (BVDV) belongs to the Pestivirus genus of the Flaviviridae family and has worldwide distribution, being one of the main causes of economic losses in cattle raising. The genome of pestiviruses is a single strand of positive-sense RNA with a length of 12.3 kb, which encodes one open reading frame flanked by untranslated regions. E2 glycoprotein is required for binding to cell-surface receptors and it also contains major antigenic determinants. The nucleotide sequence coding E2 is the most variable part of the viral genome. The heterogeneity that exists among circulating strains causes problems in the development of effective vaccines and reliable diagnostics. In this study, and for the first time analysis was made of the E2 glycoprotein coding sequences of 14 Polish BVDV-1 strains which belong to four subtypes: 1b (n = 7), 1f (n = 3), 1s (n = 3), and 1r (n = 1). These sequences showed evidence of strong purifying (negative) selection. However, we also identified positively selected sites. The availability of E2 sequences of Polish BVDV strains for reference, knowledge gained through epitope prediction attempts, and information on protein glycosylation sites can afford a better understanding of host–pathogen interactions.
Collapse
Affiliation(s)
- Paweł Mirosław
- Department of Virology, National Veterinary Research Institute, Al. Partyzantów 57, 24-100, Puławy, Poland.
| | - Mirosław P Polak
- Department of Virology, National Veterinary Research Institute, Al. Partyzantów 57, 24-100, Puławy, Poland
| |
Collapse
|
7
|
de Oliveira Figueiredo P, de Oliveira DB, Figueiredo LB, Costa GB, Alves PA, Guedes MIMC, Barbosa-Stancioli EF, Drumond BP, Abrahão JS, Kroon EG, de Souza Trindade G. Molecular detection and phylogeny of bovine viral diarrhea virus 1 among cattle herds from Northeast, Southeast, and Midwest regions, Brazil. Braz J Microbiol 2019; 50:571-577. [PMID: 30879262 DOI: 10.1007/s42770-019-00064-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 12/12/2018] [Indexed: 11/30/2022] Open
Abstract
We examined the circulating BVDV species and genotypes among cattle herds from Northeast, Southeast, and Midwest regions in Brazil. A total of 77 animals tested positive through standard PCR. Phylogenetic analyses revealed the presence of BVDV-1a, highlighting the need for better surveillance strategies to prevent BVDV spread in the country.
Collapse
Affiliation(s)
- Poliana de Oliveira Figueiredo
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
| | - Danilo Bretas de Oliveira
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.,Faculdade de Medicina, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil
| | - Leandra Barcelos Figueiredo
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Galileu Barbosa Costa
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Pedro Augusto Alves
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.,Laboratório de Imunologia de Doenças Virais, Fundação Oswaldo Cruz, Centro de Pesquisas René Rachou, Belo Horizonte, MG, Brazil
| | - Maria Isabel Maldonado Coelho Guedes
- Laboratório de Pesquisa em Virologia Animal, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Edel Figueiredo Barbosa-Stancioli
- Laboratório de Virologia Básica e Aplicada, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Betânia Paiva Drumond
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Jônatas Santos Abrahão
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Erna Geessien Kroon
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Giliane de Souza Trindade
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
| |
Collapse
|
8
|
Dalmann A, Wernike K, Reimann I, Finlaison DS, Kirkland PD, Beer M. Bungowannah virus in the affected pig population: a retrospective genetic analysis. Virus Genes 2019; 55:298-303. [PMID: 30706196 DOI: 10.1007/s11262-019-01642-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/22/2019] [Indexed: 12/15/2022]
Abstract
Bungowannah virus, which belongs to the genus Pestivirus within the family Flaviviridae, has been associated with myocarditis and a high incidence of stillbirths in pigs. In 2003, the virus was initially detected in a large pig farming complex on two separate sites in New South Wales, Australia. Until now, it has not been detected at other locations. Despite a program of depopulation and disinfection, the virus could be only eradicated from one of the affected farm complexes, the Bungowannah unit, but became endemic on the second complex, the Corowa unit. In the present study, the genetic variability of virus isolates collected between 2003 and 2014 in the endemically infected population has been retrospectively investigated. Phylogenetic analysis carried out based on sequences of the E2 and NS5B coding regions and the full-length open-reading frame revealed that the isolates from the different farm sites are closely related, but that samples collected between 2010 and 2014 at the Corowa farm site clustered in a different branch of the phylogenetic tree. Since 2010, a high-genetic stability of this RNA virus within the Corowa farm complex, probably due to an effective adaptation of the virus to the affected pig population, could be observed.
Collapse
Affiliation(s)
- Anja Dalmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Kerstin Wernike
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Ilona Reimann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Deborah S Finlaison
- Virology Laboratory, Elizabeth Macarthur Agriculture Institute, Woodbridge Rd, Menangle, NSW, 2568, Australia
| | - Peter D Kirkland
- Virology Laboratory, Elizabeth Macarthur Agriculture Institute, Woodbridge Rd, Menangle, NSW, 2568, Australia
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493, Greifswald - Insel Riems, Germany.
| |
Collapse
|
9
|
Hossain MM, Rowland RR. Replicon Particle Expressing the E2 Glycoprotein of Bovine Viral Diarrhea Virus Immunization and Evaluation of Antibody Response. Viral Immunol 2017; 31:55-61. [PMID: 28686540 DOI: 10.1089/vim.2017.0053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The objective of this study was to develop a new antigen delivery system using an alphavirus replicon particle (RP) to induce humoral antibody responses against bovine viral diarrhea virus (BVDV) recombinant antigen produced from envelope glycoprotein E2. An alphavirus RP expressing the E2 glycoprotein of BVDV was used for immunization of pigs. A fluorescent microsphere immunoassay (FMIA) has been applied to detect BVDV E2 antigen-specific antibody isotype in pig immunized with alphavirus RP. Full-length BVDV E2 (aa 1-375) was cleaved into several pieces, eight E2 DNA fragments, including full-length DNA, were cloned into expression vector pHUE, and the recombinant proteins expressed in BL-21 (DE3) Escherichia coli. After successful conjugation of purified proteins with microsphere beads, a multiplex FMIA platform was constructed, and BVDV E2 alphavirus-based RP-immunized animal serum samples were tested in the presence of bead-bound antigen targets. The results were represented as mean fluorescence intensity (MFI); the MFI values were converted to sample value/positive value (S/P) ratios. BVDV E2 (aa 1-183) showed the highest MFI values of eight recombinant E2 fragments when the specific activity of each fragment was tested. In immunized animals, data for BVDV E2-specific IgA, IgG, and IgM in serum and only IgG and IgA in oral fluids were recorded. The MFI values for the positive serum sample showed a 100-fold increase compared with the negative serum sample. Antibody isotype to BVDV E2 antigens showed that IgG > IgM > IgA in serum, whereas IgG > IgA > IgM in oral fluids. The data presented in this study suggested that boosting with the same doses of alphavirus RP in 3-week intervals may potentially enhance antibody response. The experimental results demonstrate that alphavirus RP-expressing BVDV E2 antigen induces antibody response in pig.
Collapse
Affiliation(s)
- Mohammad M Hossain
- Department of Diagnostic Medicine/Pathobiology, Center of Excellence for Emerging and Zoonotic Animal Diseases (CEEZAD), College of Veterinary Medicine, Kansas State University , Manhattan, Kansas
| | - Raymond R Rowland
- Department of Diagnostic Medicine/Pathobiology, Center of Excellence for Emerging and Zoonotic Animal Diseases (CEEZAD), College of Veterinary Medicine, Kansas State University , Manhattan, Kansas
| |
Collapse
|
10
|
Dias RK, Cargnelutti JF, Weber MN, Canal CW, Bauermann FV, Ridpath JF, Weiblen R, Flores EF. Antigenic diversity of Brazilian isolates of HoBi-like pestiviruses. Vet Microbiol 2017; 203:221-228. [PMID: 28619148 DOI: 10.1016/j.vetmic.2017.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 03/09/2017] [Accepted: 03/16/2017] [Indexed: 10/19/2022]
Abstract
Hobi-like viruses comprise an unclassified group of bovine pestiviruses related to bovine viral diarrhea virus 1 (BVDV-1) and 2 (BVDV-2). These viruses were originally identified in fetal bovine serum from Brazilian origin and, subsequently, isolated from diseased animals in several countries. Herein we performed an antigenic characterization of eight Brazilian HoBi-like viruses isolated from persistently infected (PI) animals and from gastroenteric disease (2007-2015). Phylogenetic analysis based on the 5' unstranslated region (UTR) clustered these viruses with other HoBi-like viruses from European and Asiatic origin. Monoclonal antibody (MAb) binding indicated variability in the Hobi-like virus glycoprotein E2 and significant differences from the homologous BVDV-1 and BVDV-2 glycoprotein. Analysis of antigenic relatedness based on virus-neutralizing titers using virus-specific antisera revealed that HoBi-like viruses are antigenically very different from BVDV-1 and, to a lesser extent, from BVDV-2. Cross-neutralizing assays between pairs of HoBi-like viruses and their respective antisera indicated the existence of antigenic variability among these viruses, even for viruses isolated from the same herd in different occasions. Moreover, the identification of a HoBi-like isolate with low antigenic similarity with the other isolates indicates the potential existence of antigenic subgroups among HoBi-like virus isolates. Finally, sera of lambs immunized with commercial BVDV vaccines showed low or undetectable neutralizing activity against HoBi-like isolates. These results indicate significant antigenic differences between BVDV genotypes and Brazilian HoBi-like viruses and the existence of antigenic variability within this atypical group of pestiviruses. These findings extend the knowledge about the antigenic diversity of HoBi-like viruses and reinforce the need for their inclusion in current BVDV vaccines.
Collapse
Affiliation(s)
- R K Dias
- Setor de Virologia, Universidade Federal de Santa Maria, Prédio 63A, Centro de Eventos, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - J F Cargnelutti
- Setor de Virologia, Universidade Federal de Santa Maria, Prédio 63A, Centro de Eventos, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - M N Weber
- Laboratório de Virologia, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - C W Canal
- Laboratório de Virologia, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - F V Bauermann
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, South Dakota State University, Brookings, SD 57007, United States of America
| | - J F Ridpath
- Ruminant Diseases and Immunology Unit, National Animal Disease Center, Ames, IA 50010, United States of America.
| | - R Weiblen
- Setor de Virologia, Universidade Federal de Santa Maria, Prédio 63A, Centro de Eventos, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - E F Flores
- Setor de Virologia, Universidade Federal de Santa Maria, Prédio 63A, Centro de Eventos, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil.
| |
Collapse
|
11
|
Guelbenzu-Gonzalo MP, Cooper L, Brown C, Leinster S, O’Neill R, Doyle L, Graham DA. Genetic diversity of ruminant Pestivirus strains collected in Northern Ireland between 1999 and 2011 and the role of live ruminant imports. Ir Vet J 2016; 69:7. [PMID: 27354911 PMCID: PMC4924319 DOI: 10.1186/s13620-016-0066-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 06/22/2016] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND The genus pestivirus within the family Flaviviridae includes bovine viral diarrhoea virus (BVDV) types 1 and 2, border disease virus (BDV) and classical swine fever virus. The two recognised genotypes of BVDV are divided into subtypes based on phylogenetic analysis, namely a-p for BVDV-1 and a-c for BVDV-2. METHODS Three studies were conducted to investigate the phylogenetic diversity of pestiviruses present in Northern Ireland. Firstly, pestiviruses in 152 serum samples that had previously tested positive for BVDV between 1999 and 2008 were genotyped with a RT-PCR assay. Secondly, the genetic heterogeneity of pestiviruses from 91 serum samples collected between 2008 and 2011 was investigated by phylogenetic analysis of a 288 base pair portion of the 5' untranslated region (UTR). Finally, blood samples from 839 bovine and 4,437 ovine animals imported in 2010 and 2011 were tested for pestiviral RNA. Analysis of animal movement data alongside the phylogenetic analysis of the strains was carried out to identify any links between isolates and animal movement. RESULTS No BVDV-2 strains were detected. All of the 152 samples in the first study were genotyped as BVDV-1. Phylogenetic analysis indicated that the predominant subtype circulating was BVDV-1a (86 samples out of 91). The remaining five samples clustered close to reference strains in subtype BVDV-1b. Out of the imported animals, 18 bovine samples tested positive and 8 inconclusive (Ct ≥36), while all ovine samples were negative. Eight sequences were obtained and were defined as BVDV-1b. Analysis of movement data between herds failed to find links between herds where BVDV-1b was detected. CONCLUSION Given that only BVDV-1a was detected in samples collected between 1968 and 1999, this study suggests that at least one new subtype has been introduced to Northern Ireland between 1999 and 2011 and highlights the potential for importation of cattle to introduce new strains.
Collapse
Affiliation(s)
| | - Lynsey Cooper
- Agri-Food and Biosciences Institute, Veterinary Sciences Division, Belfast, UK
| | - Craig Brown
- Agri-Food and Biosciences Institute, Veterinary Sciences Division, Belfast, UK
| | - Sam Leinster
- Agri-Food and Biosciences Institute, Veterinary Sciences Division, Belfast, UK
| | - Ronan O’Neill
- Department of Agriculture, Food and the Marine, Central Veterinary Research Laboratory, Backweston, Ireland
| | - Liam Doyle
- Department of Agriculture, Environment and Rural Affairs of Northern Ireland, Belfast, UK
| | | |
Collapse
|
12
|
Tajima M, Dubovi EJ. Genetic and Clinical Analyses of Bovine Viral Diarrhea Virus Isolates from Dairy Operations in the United States of America. J Vet Diagn Invest 2016; 17:10-5. [PMID: 15690945 DOI: 10.1177/104063870501700104] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
To assess the prevalence of bovine viral diarrhea virus (BVDV) on the basis of the genotype and clinical signs, isolates from 16 dairy herds (bulk milk samples) and 37 BVDV-infected cattle were examined. Isolates for this study were selected from submissions that contained an adequate clinical history. A part of the E2 gene of BVDV from these isolates was amplified by reverse transcription-polymerase chain reaction. From the nucleotide sequence of the amplified products, phylogenetic analyses were performed and genotypes or subgenotypes were identified. Forty percent of the selected field isolates were BVDV-2, and 60% were BVDV-1. Eighty-one percent of BVDV-1 isolates were determined to be the BVDV-1b subgenotype. BVDV-1b and BVDV-2 formed more closely related clusters in each group than did the BVDV-1a isolates. There was no obvious association of any genotype or subgenotype with geographical localization or clinical manifestations. A higher prevalence of BVDV-2 infection was found in the United States than in other countries. BVDV-1a has been thought of as a prototype of BVDV; however, there were fewer isolations of BVDV-1a than of other subgenotypes of BVDV Phylogenetic analyses of BVDV isolates using the E2 region of the genome generated results similar to those of studies done in the United States using the 5' untranslated region.
Collapse
Affiliation(s)
- Motoshi Tajima
- Veterinary Teaching Hospital, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | | |
Collapse
|
13
|
Gong W, Lu Z, Zhang L, Xie X, Jiang D, Jia J, Guo H, Shi J, Tu C. In vitro adaptation and genome analysis of a sub-subgenotype 2.1c isolate of classical swine fever virus. Virus Genes 2016; 52:651-9. [PMID: 27155669 DOI: 10.1007/s11262-016-1350-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 04/26/2016] [Indexed: 11/25/2022]
Abstract
Classical swine fever (CSF) still causes substantial economic losses in the pig industry in China. This study reports the isolation and characterization of a field CSF virus named GD53/2011 from pig kidney tissue collected during a CSF outbreak in Guangdong province, China. Phylogenetic analysis based on the full-length E2 gene sequence revealed that this isolate belongs to CSFV sub-subgenotype 2.1c. To further understand the replication characteristics, GD53/2011 was subsequently adapted in PK-15 cells, and its full-length genome was sequenced. After adaptation in PK-15 cells, the titer of GD53/2011 was significantly increased from 10(3.39) TCID50/ml at passage 6 (F6) to 10(8.50) TCID50/ml at passage 46 (F46) with the peak titer obtained at 48 h post-inoculation. Sequence comparison revealed that the E(rns) gene at passages 6, 15, and 25 of GD53/2011 was identical to that in the original tissue, but one amino acid substitution (S476R) was detected at passages 35 and 46. Furthermore, E2 gene sequences at passages 6, 15, 25, 35, and 46 was found identical to that in the original tissue, indicating that the E2 gene was stable during CSF virus adaptation in PK-15 cells. Full-length protein sequence comparison of GD53/2011 with other 2.1 sub-subgenotype isolates showed that Core and NS5A, rather than E2, are more genetically variable. Taken together, a field CSFV strain GD53/2011 was isolated, fully sequenced, and adapted to high growth titer in PK-15 cells, which might be suitable for future studies on CSFV infection, replication, and vaccine development.
Collapse
Affiliation(s)
- Wenjie Gong
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, 66506, USA
| | - Zongji Lu
- College of Life Science, Foshan University, Foshan, Guangdong, 528231, China
| | - Li Zhang
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, 130122, China
| | - Xiaoming Xie
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, 130122, China
| | - Daliang Jiang
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Junjie Jia
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Huancheng Guo
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Jishu Shi
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, 66506, USA.
| | - Changchun Tu
- Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun, 130122, China.
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China.
| |
Collapse
|
14
|
Maya L, Puentes R, Reolón E, Acuña P, Riet F, Rivero R, Cristina J, Colina R. Molecular diversity of bovine viral diarrhea virus in uruguay. Arch Virol 2015; 161:529-35. [PMID: 26597189 DOI: 10.1007/s00705-015-2688-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 11/14/2015] [Indexed: 10/22/2022]
Abstract
Bovine viral diarrhea (BVD) affects bovine production and reproduction causing significant economic losses all over the world. Two viral species has been recognized: BVDV-1 and BVDV-2, both distributed worldwide. Recently, novel specie of BVDV named HoBi-like pestivirus was discovered. The presence of BVDV was confirmed in 1996 in Uruguay, however, does not exist until today a schedule of compulsory vaccination along the country. Serological studies with samples from all Uruguayan herds were performed during 2000 and 2001 demonstrating that all of them were seropositive to BVDV with a mean prevalence of 69%. In addition, there have been no new studies done since those previously described and it is important to mention that the genetic diversity of BVD has never been described in Uruguay. Nowadays, there is strongly suspect that BVDV is one of the most important causes of reproductive failures in our herds. The aim of this study was to describe for the first time in Uruguay the genetic diversity of BVDV with samples collected from different regions along the country. Serological status of 390 non-vaccinated animals against BVDV with reproductive problems from farms of Rivera, Tacuarembó and Florida departments of Uruguay were studied. All herds were seropositive to BVDV and high proportion of animals were positive (298/390), while 4.1% (16/390) of the animals were positive to Antigen Capture ELISA test and Real Time PCR. Phylogenetic analysis performed with concatenated sequences from the 5'UTR and Npro genomic regions revealed that BVDV-1 and BVDV-2 are infecting our herds, being BVDV-1 the most frequently found. The major subtype was BVDV-1a, followed by BVDV-1i and BVDV-2b. This is the first study that describes the genetic diversity of BVDV in Uruguay and it will contribute to the elaboration of sanitization programs.
Collapse
Affiliation(s)
- L Maya
- Laboratorio de Virología Molecular, Regional Norte, CENUR Noroeste, Universidad de la República, Gral. Rivera 1350, 50000, Salto, Uruguay
| | - R Puentes
- Área de Inmunología, Facultad de Veterinaria, Universidad de la República, Lasplaces 1550, 11500, Montevideo, Uruguay
| | - E Reolón
- Laboratorios Santa Elena-VIRBAC, Av. Millán 4175, CP 12900, Montevideo, Uruguay
| | - P Acuña
- Laboratorios Santa Elena-VIRBAC, Av. Millán 4175, CP 12900, Montevideo, Uruguay
| | - F Riet
- Instituto Nacional de Investigación Agropecuaria (INIA), La Estanzuela, CP 70.000, Casilla De Correo, 39173, Colonia del Sacramento, Uruguay
| | - R Rivero
- DILAVE "Miguel C. Rubino", Laboratorio Regional Noroeste, Casilla De Correo 57.037. CP 60.000, Paysandú, Uruguay
| | - J Cristina
- Laboratorio de Virología Molecular, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Iguá 4225, 11400, Montevideo, Uruguay
| | - R Colina
- Laboratorio de Virología Molecular, Regional Norte, CENUR Noroeste, Universidad de la República, Gral. Rivera 1350, 50000, Salto, Uruguay.
| |
Collapse
|
15
|
Immunisation of Sheep with Bovine Viral Diarrhoea Virus, E2 Protein Using a Freeze-Dried Hollow Silica Mesoporous Nanoparticle Formulation. PLoS One 2015; 10:e0141870. [PMID: 26535891 PMCID: PMC4633290 DOI: 10.1371/journal.pone.0141870] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 10/14/2015] [Indexed: 12/20/2022] Open
Abstract
Bovine viral diarrhoea virus 1 (BVDV-1) is arguably the most important viral disease of cattle. It is associated with reproductive, respiratory and chronic diseases in cattle across the world. In this study we have investigated the capacity of the major immunological determinant of BVDV-1, the E2 protein combined with hollow type mesoporous silica nanoparticles with surface amino functionalisation (HMSA), to stimulate immune responses in sheep. The current work also investigated the immunogenicity of the E2 nanoformulation before and after freeze-drying processes. The optimal excipient formulation for freeze-drying of the E2 nanoformulation was determined to be 5% trehalose and 1% glycine. This excipient formulation preserved both the E2 protein integrity and HMSA particle structure. Sheep were immunised three times at three week intervals by subcutaneous injection with 500 μg E2 adsorbed to 6.2 mg HMSA as either a non-freeze-dried or freeze-dried nanoformulation. The capacity of both nanovaccine formulations to generate humoral (antibody) and cell-mediated responses in sheep were compared to the responses in sheep immunisation with Opti-E2 (500 μg) together with the conventional adjuvant Quil-A (1 mg), a saponin from the Molina tree (Quillaja saponira). The level of the antibody responses detected to both the non-freeze-dried and freeze-dried Opti-E2/HMSA nanoformulations were similar to those obtained for Opti-E2 plus Quil-A, demonstrating the E2 nanoformulations were immunogenic in a large animal, and freeze-drying did not affect the immunogenicity of the E2 antigen. Importantly, it was demonstrated that the long term cell-mediated immune responses were detectable up to four months after immunisation. The cell-mediated immune responses were consistently high in all sheep immunised with the freeze-dried Opti-E2/HMSA nanovaccine formulation (>2,290 SFU/million cells) compared to the non-freeze-dried nanovaccine formulation (213–500 SFU/million cells). This study is the first to demonstrate that a freeze-dried silica mesoporous nanovaccine formulation gives balanced immune responses in a production animal.
Collapse
|
16
|
Giammarioli M, Ridpath J, Rossi E, Bazzucchi M, Casciari C, De Mia G. Genetic detection and characterization of emerging HoBi-like viruses in archival foetal bovine serum batches. Biologicals 2015; 43:220-4. [DOI: 10.1016/j.biologicals.2015.05.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 05/14/2015] [Accepted: 05/18/2015] [Indexed: 10/23/2022] Open
|
17
|
Impact of species and subgenotypes of bovine viral diarrhea virus on control by vaccination. Anim Health Res Rev 2015; 16:40-54. [DOI: 10.1017/s1466252315000079] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractBovine viral diarrhea viruses (BVDV) are diverse genetically and antigenically. This diversity impacts both diagnostic testing and vaccination. In North America, there are two BVDV species, 1 and 2 with 3 subgentoypes, BVDV1a, BVDV1b and BVDV2a. Initially, US vaccines contained BVDV1a cytopathic strains. With the reporting of BVDV2 severe disease in Canada and the USA there was focus on protection by BVDV1a vaccines on BVDV2 disease. There was also emphasis of controlling persistently infected (PI) cattle resulted in studies for fetal protection afforded by BVDV1a vaccines. Initially, studies indicated that some BVDV1a vaccines gave less than 100% protection against BVDV2 challenge for fetal infection. Eventually vaccines in North America added BVDV2a to modified live virus (MLV) and killed BVDV1a vaccines. Ideally, vaccines should stimulate complete immunity providing 100% protection against disease, viremias, shedding, and 100% fetal protection in vaccinates when challenged with a range of diverse antigenic viruses (subgenotypes). There should be a long duration of immunity stimulated by vaccines, especially for fetal protection. MLV vaccines should be safe when given according to the label and free of other pathogens. While vaccines have now included BVDV1a and BVDV2a, with the discovery of the predominate subgenotype of BVDV in the USA to be BVDV1b, approximately 75% or greater in prevalence, protection in acute challenge and fetal protection studies became more apparent for BVDV1b. Thus many published studies examined protection by BVDV1a and BVDV2a vaccines against BVDV1b in acute challenge and fetal protection studies. There are no current BVDV1b vaccines in the USA. There are now more regulations on BVDV reproductive effects by the USDA Center for Veterinary Biologics (CVB) regarding label claims for protection against abortion, PI calves, and fetal infections, including expectations for studies regarding those claims. Also, the USDA CVB has a memorandum providing the guidance for exemption of the warning label statement against the use of the MLV BVDV in pregnant cows and calves nursing pregnant cows. In reviews of published studies in the USA, the results of acute challenge and fetal protection studies are described, including subgenotypes in vaccines and challenge strains and the results in vaccinates and the vaccinates' fetuses/newborns. In general, vaccines provide protection against heterologous strains, ranging from 100% to partial but statistically significant protection. In recent studies, the duration of immunity afforded by vaccines was investigated and reported. Issues of contamination remain, especially since fetal bovine serums may be contaminated with noncytopathic BVDV. In addition, the potential for immunosuppression by MLV vaccines exists, and new vaccines will be assessed in the future to prove those MLV components are not immunosuppressive by experimental studies. As new subgenotypes are found, the efficacy of the current vaccines should be evaluated for these new strains.
Collapse
|
18
|
Abstract
Classical swine fever (CSF) is one of the most devastating epizootic diseases of pigs, causing high morbidity and mortality worldwide. The diversity of clinical signs and similarity in disease manifestations to other diseases make CSF difficult to diagnose with certainty. The disease is further complicated by the presence of a number of different strains belonging to three phylogenetic groups. Advanced diagnostic techniques allow detection of antigens or antibodies in clinical samples, leading to implementation of proper and effective control programs. Polymerase chain reaction (PCR)-based methods, including portable real-time PCR, provide diagnosis in a few hours with precision and accuracy, even at the point of care. The disease is controlled by following a stamping out policy in countries where vaccination is not practiced, whereas immunization with live attenuated vaccines containing the 'C' strain is effectively used to control the disease in endemic countries. To overcome the problem of differentiation of infected from vaccinated animals, different types of marker vaccines, with variable degrees of efficacy, along with companion diagnostic assays have been developed and may be useful in controlling and even eradicating the disease in the foreseeable future. The present review aims to provide an overview and status of CSF as a whole with special reference to swine husbandry in India.
Collapse
|
19
|
Studies on genetic diversity of bovine viral diarrhea viruses in Danish cattle herds. Virus Genes 2013; 48:376-80. [PMID: 24318456 DOI: 10.1007/s11262-013-1020-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 11/22/2013] [Indexed: 10/25/2022]
Abstract
Scandinavian countries have successfully pursued bovine viral diarrhea virus (BVDV) eradication without the use of vaccines. In Denmark, control and eradication of BVDV were achieved during the last two decades, but occasionally new BVDV infections are detected in some Danish cattle herds. The aim of this study was to determine recent BVDV subtypes isolated from 4 Danish herds (A, B, C, and D) isolated in 2009-2012 and to analyze the genetic variation of these isolates within the same herd and its relation with those of other herds. The results showed that three herds (B, C, D) were BVDV 1-b and only one herd (herd A) was BVDV 1-d, no other subtypes were detected. The deduced E2 amino acids result showed a high identity percent (99-100 %) between isolates originating from the same herd, but with higher variation compared to isolates of the other herds. Some of these new Danish strains have closer relationship to BVDVs from outside Denmark than to older Danish strains indicating that these are new introductions to Denmark. In conclusion, BVDV-1 subtypes recently detected in Denmark were only subtypes 1b and 1d, and BVDV infections established in a herd is genetically stable over a long time period.
Collapse
|
20
|
Pecora A, Malacari DA, Ridpath JF, Perez Aguirreburualde MS, Combessies G, Odeón AC, Romera SA, Golemba MD, Wigdorovitz A. First finding of genetic and antigenic diversity in 1b-BVDV isolates from Argentina. Res Vet Sci 2013; 96:204-12. [PMID: 24295740 DOI: 10.1016/j.rvsc.2013.11.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 10/30/2013] [Accepted: 11/10/2013] [Indexed: 10/26/2022]
Abstract
Infection with Bovine Viral Diarrhea Viruses (BVDV) in cattle results in a wide range of clinical manifestations, ranging from mild respiratory disease to fetal death and mucosal disease, depending on the virulence of the virus and the immune and reproductive status of the host. In this study 30 Argentinean BVDV isolates were characterized by phylogenetic analysis. The isolates were genotyped based on comparison of the 5' untranslated region (5' UTR) and the E2 gene. In both phylogenetic trees, 76% of the viruses were assigned to BVDV 1b, whereas BVDV 1a, 2a and 2b were also found. Eight of the BVDV 1b isolates were further characterized by cross-neutralization tests using guinea pig antisera and sera from bovines vaccinated with two different commercial vaccines. The results demonstrated the presence of a marked antigenic diversity among Argentinean BVDV isolates and suggest the need to incorporate BVDV 1b isolates in diagnostic strategies.
Collapse
Affiliation(s)
- A Pecora
- Virology Institute, Veterinary and Agricultural Science Research Centre, INTA Castelar, Buenos Aires, Argentina
| | - D A Malacari
- Virology Institute, Veterinary and Agricultural Science Research Centre, INTA Castelar, Buenos Aires, Argentina.
| | - J F Ridpath
- Ruminant Diseases and Immunology Research Unit USDA, Ames, USA
| | - M S Perez Aguirreburualde
- Virology Institute, Veterinary and Agricultural Science Research Centre, INTA Castelar, Buenos Aires, Argentina
| | - G Combessies
- Laboratorio Azul Diagnóstico, Buenos Aires, Argentina
| | - A C Odeón
- Laboratorio de Sanidad Animal, INTA Balcarce, Buenos Aires, Argentina
| | - S A Romera
- Virology Institute, Veterinary and Agricultural Science Research Centre, INTA Castelar, Buenos Aires, Argentina
| | - M D Golemba
- Departamento de Virología, Facultad de Farmacia y Bioquímica UBA, Buenos Aires, Argentina
| | - A Wigdorovitz
- Virology Institute, Veterinary and Agricultural Science Research Centre, INTA Castelar, Buenos Aires, Argentina
| |
Collapse
|
21
|
Jelsma H, Loeffen WLA, van Beuningen A, van Rijn PA. Preliminary mapping of non-conserved epitopes on envelope glycoprotein E2 of Bovine viral diarrhea virus type 1 and 2. Vet Microbiol 2013; 166:195-9. [PMID: 23838147 DOI: 10.1016/j.vetmic.2013.06.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 05/23/2013] [Accepted: 06/10/2013] [Indexed: 11/25/2022]
Abstract
Bovine viral diarrhea virus (BVDV) belongs together with Classical swine fever virus (CSFV) and Border disease virus (BDV) to the genus Pestivirus in the Flaviviridae family. BVDV has been subdivided into two different species, BVDV1 and BVDV2 based on phylogenetic analysis. Subsequent characterization of both strains revealed major antigenic differences. Because the envelope glycoprotein E2 is the most immunodominant protein for all pestiviruses, the present study focused on epitope mapping by constructing chimeric BVDV type 1 and 2 E2 genes in expression plasmids. These plasmids with chimeric E2-genes were transfected in SK6 cells and transient expression was studied by immunostaining with a panel of MAbs specific for E2 of BVDV1 or BVDV2, resulting in the localization of type-specific antigenic domains at similar regions. These results indicate that E2 glycoproteins of both BVDV types exhibit a comparable antigenic structure, but with type specific epitopes. In addition, the antigenic resemblance with envelope glycoprotein E2 of Classical swine fever virus is discussed.
Collapse
Affiliation(s)
- H Jelsma
- Central Veterinary Institute of Wageningen UR, P.O. Box 65, 8200 AB Lelystad, The Netherlands.
| | | | | | | |
Collapse
|
22
|
Ridpath JF, Falkenberg SM, Bauermann FV, VanderLey BL, Do Y, Flores EF, Rodman DM, Neill JD. Comparison of acute infection of calves exposed to a high-virulence or low-virulence bovine viral diarrhea virus or a HoBi-like virus. Am J Vet Res 2013; 74:438-42. [DOI: 10.2460/ajvr.74.3.438] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
23
|
Molecular biology of bovine viral diarrhea virus. Biologicals 2013; 41:2-7. [DOI: 10.1016/j.biologicals.2012.07.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 06/27/2012] [Accepted: 07/06/2012] [Indexed: 11/21/2022] Open
|
24
|
Giammarioli M, La Rocca SA, Steinbach F, Casciari C, De Mia GM. Genetic and antigenic typing of border disease virus (BDV) isolates from Italy reveals the existence of a novel BDV group. Vet Microbiol 2011; 147:231-6. [DOI: 10.1016/j.vetmic.2010.06.027] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 06/16/2010] [Accepted: 06/29/2010] [Indexed: 11/24/2022]
|
25
|
Oem JK, Chung JY, Roh IS, Kim HR, Bae YC, Lee KH, Jin YH, Lee OS. Characterization and Phylogenetic Analysis of Bovine Viral Diarrhea Virus in Brain Tissues from Nonambulatory (Downer) Cattle in Korea. J Vet Diagn Invest 2010; 22:518-23. [DOI: 10.1177/104063871002200404] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Between August 2008 and May 2009, 386 brain and serum samples from adult cattle (2–7 years old) showing a variety of clinical signs of downer cow syndrome were received by the National Veterinary Research and Quarantine Service. All brain samples were tested for the presence of Bovine viral diarrhea virus (BVDV) by reverse transcription polymerase chain reaction (RT-PCR), immunohistochemistry (IHC), and antigen capture ELISA (Ag-ELISA). The BVDV nucleic acid was detected in 54 of 386 (15.5%) brain samples tested by RT-PCR. Positive results were detected in 14 (3.67%) and 13 (3.4%) of samples tested by IHC and Ag-ELISA, respectively. Both BVDV nucleic acid and antigen were detected in 11 cattle (2.9%) by all 3 diagnostic tests; however, antibodies against BVDV were not detected in these 11 cattle. A molecular classification of the identified viral strains ( n = 40) was also carried out. Neighbor-joining phylogenetic analysis revealed that most of the identified viruses belonged to BVDV genotype 1a ( n = 10), 1b ( n = 16), and 2a ( n = 8). The remaining strains were subtypes 1c ( n = 1), 1n ( n = 4), and 1m ( n = 1). Interestingly, most of the BVDV-1b strains ( n = 9) identified in brain samples were confirmed by all 3 diagnostic tests. Further studies should be performed to determine why the BVDV-1b strain was found in brain samples that were positive using all 3 diagnostic tests.
Collapse
Affiliation(s)
- Jae-Ku Oem
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - Joon-Yee Chung
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - In-Soon Roh
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - Hye-Ryoung Kim
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - You-Chan Bae
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - Kyung-Hyun Lee
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - Young-Hwa Jin
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| | - O-Soo Lee
- National Veterinary Research and Quarantine Service, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea
| |
Collapse
|
26
|
Fan ZC, Bird RC. The extra 16-amino-acid peptide at C-terminal NS2 of the hypervirulent type-2 bovine viral diarrhea viruses has no effect on viral replication and NS2-3 processing of type-1 virus. Virus Genes 2010; 41:218-23. [DOI: 10.1007/s11262-010-0503-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2009] [Accepted: 06/11/2010] [Indexed: 11/24/2022]
|
27
|
Ridpath JF. Bovine viral diarrhea virus: global status. Vet Clin North Am Food Anim Pract 2010; 26:105-21, table of contents. [PMID: 20117546 DOI: 10.1016/j.cvfa.2009.10.007] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Despite the success of regional bovine viral diarrhea viruses (BVDV) eradication programs, infections remain a source of economic loss for producers. The wide variation among BVDV results in differences in genotype, biotype, virulence, and types of infections. BVDV infect a range of domestic and wild ruminants. Clinical presentation varies depending on strain of virus, species of host, immune status of host, reproductive status of host, age of host, and concurrent infections. Recent advances in BVDV research and diagnostics have led to the development of regional eradication/control programs, the most efficacious of which focus on biosecurity, surveillance, and control.
Collapse
Affiliation(s)
- Julia F Ridpath
- Ruminant Diseases and Immunology Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA 50010, USA.
| |
Collapse
|
28
|
Tignon M, Kulcsár G, Haegeman A, Barna T, Fábián K, Lévai R, Van der Stede Y, Farsang A, Vrancken R, Belák K, Koenen F. Classical swine fever: Comparison of oronasal immunisation with CP7E2alf marker and C-strain vaccines in domestic pigs. Vet Microbiol 2010; 142:59-68. [DOI: 10.1016/j.vetmic.2009.09.044] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
29
|
Ridpath JF, Fulton RW. Knowledge gaps impacting the development of bovine viral diarrhea virus control programs in the United States. J Am Vet Med Assoc 2009; 235:1171-9. [DOI: 10.2460/javma.235.10.1171] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
30
|
Phylogenetic analysis and characterization of Korean bovine viral diarrhea viruses. Vet Microbiol 2009; 139:356-60. [DOI: 10.1016/j.vetmic.2009.06.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2009] [Revised: 05/28/2009] [Accepted: 06/12/2009] [Indexed: 11/22/2022]
|
31
|
Kortekaas J, Vloet RPM, Weerdmeester K, Ketelaar J, van Eijk M, Loeffen WL. Rational design of a classical swine fever C-strain vaccine virus that enables the differentiation between infected and vaccinated animals. J Virol Methods 2009; 163:175-85. [PMID: 19770004 DOI: 10.1016/j.jviromet.2009.09.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2009] [Revised: 09/05/2009] [Accepted: 09/10/2009] [Indexed: 11/25/2022]
Abstract
The C-strain of the classical swine fever virus (CSFV) is considered the gold standard vaccine for the control of CSF. This vaccine, however, does not enable the serological differentiation between infected and vaccinated animals (DIVA). Consequently, its use can impose severe trade restrictions. The immunodominant and evolutionarily conserved A-domain of the E2 structural glycoprotein is an important target in CSFV-specific ELISAs. With the ultimate aim to render the C-strain suitable as a DIVA vaccine, mutations were introduced that were expected to dampen the immunogenicity of the A-domain. In the first of two approaches, the feasibility of shielding the A-domain by N-linked glycans was evaluated, whereas in the second approach C-strain mutants were created with targeted deletions in the A-domain. Analysis of the antibody responses elicited in rabbits suggested that shielding of the A-domain by an N-linked glycan had a minor effect on the immune response against the A-domain, whereas a targeted deletion of only a single amino acid severely dampened this response. C-strain mutants with larger deletions were highly debilitated and incapable of sustained growth in vitro. By providing the viruses with the opportunity to increase their fitness by mutation, a mutant was rescued that found a way to compensate for the imposed fitness cost. Most of the identified mutations occurred in several independently evolved viruses, demonstrating parallel evolution. By virtue of this compensatory evolution, a well replicating and genetically stable C-strain mutant was produced that can be serologically differentiated from wildtype CSFV. The findings provide the molecular basis for the development of a novel, genetically stable, live attenuated CSF DIVA vaccine.
Collapse
Affiliation(s)
- J Kortekaas
- Virology Division, Central Veterinary Institute of Wageningen University Research Centre, P.O. Box 65, 8200 AB Lelystad, The Netherlands.
| | | | | | | | | | | |
Collapse
|
32
|
Seroprevalence and risk factors for the presence of ruminant pestiviruses in the Dutch swine population. Vet Microbiol 2009; 136:240-5. [DOI: 10.1016/j.vetmic.2008.11.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Revised: 11/12/2008] [Accepted: 11/20/2008] [Indexed: 11/23/2022]
|
33
|
Regeneration and characterization of a recombinant bovine viral diarrhea virus and determination of its efficacy to cross the bovine placenta. Virus Genes 2008; 38:129-35. [PMID: 19067148 DOI: 10.1007/s11262-008-0308-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Accepted: 11/17/2008] [Indexed: 10/21/2022]
Abstract
The capacity of different bovine viral diarrhea virus (BVDV) strains to cause transplacental infection is variable. BVDV strain SD-1 was isolated from a persistently infected heifer. Its genome represents the only reported nucleotide sequence of a noncytopathic viral isolate determined without cell culture passage in the laboratory. Thus, SD-1 might possess biological advantages over other NCP BVDV strains to be used as a model virus for investigation of viral transplacental transmission. To evaluate if a molecularly generated BVDV SD-1 is capable of crossing the bovine placenta efficiently, a full-length cDNA clone of SD-1 was constructed using RT-PCR amplification and standard molecular techniques. In vitro transcripts synthesized from the cDNA template directed the generation of infectious virus in MDBK cells with a transfection efficiency as high as 4.7 x 10(5) FFU/mug RNA. The recovered virus termed ASD1 harbored five silent point mutations engineered as genetic markers and was similar to wild type (wt) SD-1 in viral growth kinetics. As evaluated in the pregnant heifers, ASD1 was capable of crossing the bovine placenta efficiently, suggesting that NCP BVDV SD-1 is a suitable viral backbone for investigation of the role of viral genetic element(s) in viral transplacental transmission by allowing for evaluation of newly created viral mutants.
Collapse
|
34
|
Van Gennip H, Miedema G, Moormann R, Van Rijn P. Functionality of Chimeric E2 Glycoproteins of BVDV and CSFV in Virus Replication. Virology (Auckl) 2008. [DOI: 10.4137/vrt.s589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
An intriguing difference between the E2 glycoprotein of CSFV and the other groups of pestiviruses (nonCSFV) is a lack of two cysteine residues on positions cysteine 751 and 798. Other groups of pestivirus are not restricted to one species as swine, whereas CSFV is restricted to swine and wild boar. We constructed chimeric CSFV/BVDV E2 genes based on a 2D model of E2 proposed by van Rijn et al. (van Rijn et al. 1994, J Virol 68, 3934–42) and confirmed their expression by immunostaining of plasmid-transfected SK6 cells. No equivalents for the antigenic units B/C and A were found on E2 of BVDVII. This indicates major structural differences in E2. However, the immunodominant BVDVII domain A, containing epitopes with essential amino acids between position 760–764, showed to be dependent on the presence of the region defined by amino acids 684 to 796. As for the A domain of CSFV, the BVDVII A-like domain seemed to function as a separate unit. These combined domains in E2 proved to be the only combination which was functional in viral background of CSFV C-strain. The fitness of this virus (vflc36BVDVII 684–796) seemed to be reduced compared to vflc9 (with the complete antigenic region of BVDVII).
Collapse
Affiliation(s)
- H.G.P. Van Gennip
- Central Veterinary Institute of (CVI) of Wageningen UR, P.O. Box 2004, 8203 AA Lelystad, The Netherlands
| | - G.K.W Miedema
- Central Veterinary Institute of (CVI) of Wageningen UR, P.O. Box 2004, 8203 AA Lelystad, The Netherlands
| | - R.J.M. Moormann
- Central Veterinary Institute of (CVI) of Wageningen UR, P.O. Box 2004, 8203 AA Lelystad, The Netherlands
| | - P.A Van Rijn
- Central Veterinary Institute of (CVI) of Wageningen UR, P.O. Box 2004, 8203 AA Lelystad, The Netherlands
| |
Collapse
|
35
|
van Rijn PA. A common neutralizing epitope on envelope glycoprotein E2 of different pestiviruses: Implications for improvement of vaccines and diagnostics for classical swine fever (CSF)? Vet Microbiol 2007; 125:150-6. [PMID: 17561359 DOI: 10.1016/j.vetmic.2007.05.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2007] [Revised: 05/07/2007] [Accepted: 05/09/2007] [Indexed: 10/23/2022]
Abstract
The Pestivirus genus within the family of Flaviviridae consists of at least three species; classical swine fever virus (CSFV) found in swine and wild boar, bovine viral diarrhoea virus type 1 and type 2 (BVDV-I and BVDV-II) mainly isolated from cattle and border disease virus (BDV) preferably replicating in ovine species. Many features demonstrate differences between CSFV and other pestiviruses, BVDV-I, BVDV-II and BDV, here defined as nonCSFV, whereas other features show similarities between all different species of pestiviruses. Focussing on the major envelope glycoprotein E2, the immunodominant protein of pestiviruses, CSFV seems to be a more distinct species within the Pestivirus genus. Here we confirm on one hand the more separated grouping of CSFV by isolation of monoclonal antibodies (MAbs) raised against E2 of BVDV-I and BVDV-II. None of these MAbs recognize E2 of CSFV strains. On the other hand, only one MAb, MAb 912, was isolated against E2 of BDV. MAb 912 binds to E2 of CSFV strains and partly neutralizes CSFV. The epitope of MAb 912 is mapped in antigenic domain B of CSFV-E2. This common epitope of CSFV strains and nonCSFV strains could have implications for development of DIVA vaccines and serological diagnostics for CSF.
Collapse
Affiliation(s)
- P A van Rijn
- Central Institute for Animal Disease Control (CIDC-Lelystad), 8203 AA, Lelystad, The Netherlands.
| |
Collapse
|
36
|
Zhao Y, Qin J, Guo H, Zuo Y, Zhang B, Zhang L. Cloning and sequence analysis of genetic variation on NS2–3 of bovine viral diarrhea virus (HB-DCZ) strain in Hebei Province, China. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/s11703-007-0058-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
37
|
Abstract
BVDV is associated with a range of economically important clinical diseases including reproductive disorders and acute fatal haemorrhagic disease in cattle industry. Vaccination is still the most important control strategy for controlling BVDV infections in many countries of the world. The existence of great genetic and antigenic diversity of BVDV isolates is very important concern for BVDV vaccine development and protective efficacy of current vaccines. In this review, the protective efficacies of the selected examples of BVDV vaccines with regard to BVDV diversity and the novel marker vaccine development studies are discussed.
Collapse
Affiliation(s)
- A T Kalaycioglu
- T.C. Kafkas University, Faculty of Veterinary Medicine, 36100, Kars, Turkey.
| |
Collapse
|
38
|
Xu X, Zhang Q, Yu X, Liang L, Xiao C, Xiang H, Tu C. Sequencing and comparative analysis of a pig bovine viral diarrhea virus genome. Virus Res 2006; 122:164-70. [PMID: 16854490 DOI: 10.1016/j.virusres.2006.05.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2006] [Revised: 05/09/2006] [Accepted: 05/21/2006] [Indexed: 10/24/2022]
Abstract
In present study, we report the first complete genomic sequence of pig bovine viral diarrhea (BVD) virus, that of strain ZM-95, which is 12,220 nucleotides long and contains short 5' and 3' non-coding regions and one open reading frame encoding a large polyprotein with 28 potential N-glycosylation sites (Asn-X-Ser or Asn-X-Thr). Within the non-structural protein encoding region, no foreign nucleotide insertions was found as those usually observed for cytopathogenic BVDV-1, but close to the 3'-terminal of the capsid protein (1119-1124bp) it contains a short insertion of a six nucleotide sequence (CTCACA). Three hypervariable regions were identified in the polyprotein-encoding region, with one of them comprising a sequence motif encoding a unique five amino acid peptide HYKKK in glycoprotein E2 gene. The genomic comparison and phylogenetic analyses showed that ZM-95 should be classified into BVDV-1, but was genetically divergent from other pestiviruses sequenced to date since its highest genetic similarity was only 76.6% (with SD-1), therefore, placed as a novel subgroup of BVDV-1.
Collapse
Affiliation(s)
- Xingran Xu
- Institute of Military Veterinary, Academy of Military Medical Sciences, 1068 Qinglong Road, Changchun 130062, China
| | | | | | | | | | | | | |
Collapse
|
39
|
Vilcek S, Nettleton PF. Pestiviruses in wild animals. Vet Microbiol 2006; 116:1-12. [PMID: 16839713 DOI: 10.1016/j.vetmic.2006.06.003] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2005] [Revised: 04/14/2006] [Accepted: 06/01/2006] [Indexed: 11/17/2022]
Abstract
Pestiviruses are not strictly host-species specific and can infect not only domestic but also wild animals. The most important pestivirus, CSFV, infects domestic pigs and wild boars, which may cause a major problem for successful CSFV eradication programmes. Mainly BVDV specific antibodies have been reported in captive and free-living animals. Virus has been isolated from some of these animal species, but since BVDV can contaminate cell cultures and foetal calf serum, early reports of BVDV isolation have to be considered with caution. Genetic typing of early pestivirus isolates from wild species revealed that the majority were BVDV-1. Of the pestiviruses identified so far three species (CSFV, BVDV-1, giraffe pestivirus) and three genotypes (BDV-2, BDV-4, pronghorn) appear to circulate in wildlife animal populations. The potential for pestiviruses to spread between farm animals and free-living animals is discussed as are epidemiological and technical problems, and the future direction of research.
Collapse
Affiliation(s)
- S Vilcek
- University of Veterinary Medicine, Depatment of Infectious Diseases and Parasitology, Komenskeho 73, 041 81 Kosice, Slovakia
| | | |
Collapse
|
40
|
Fulton RW, Ridpath JF, Ore S, Confer AW, Saliki JT, Burge LJ, Payton ME. Bovine viral diarrhoea virus (BVDV) subgenotypes in diagnostic laboratory accessions: distribution of BVDV1a, 1b, and 2a subgenotypes. Vet Microbiol 2006; 111:35-40. [PMID: 16263224 DOI: 10.1016/j.vetmic.2005.10.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2005] [Revised: 09/11/2005] [Accepted: 10/03/2005] [Indexed: 10/25/2022]
Abstract
The prevalence of bovine viral diarrhoea virus (BVDV) biotypes and subgenotypes was determined from 131 BVDV positive samples from a diagnostic laboratory. The majority of the isolates were from Oklahoma; however, other states including Kansas, Texas, and Arkansas were represented. These BVDV samples were from submissions of 76 live animals and 55 necropsy samples. There were 131 BVDV samples represented by 117 noncytopathic (NCP), 11 cytopathic (CP) and 3 cases with mixed NCP and CP biotypes. The NCP isolates were more common (P < 0.05) than the CP and NCP/CP combination. The BVDV samples were segregated into three subgenotypes by differential PCR and sequencing of a viral genomic region, 5'-untranslated region (5'-UTR). There were more BVDV1b subgenotypes 60/131 (45.8%) than BVDV1a, 37/131 (28.2%) or BVDV2a, 34/131 (26.0%) (P < 0.05). The organ system involvement included the major categories such as respiratory, digestive, mixed/multiple organs, abortions, and persistent infections (PI). All three BVDV subgenotypes were found in persistently infected (PI) cattle and respiratory diseases, both major requests for BVDV diagnosis. Only one of the 131 viruses was genetically similar to the strains present in U.S. vaccines.
Collapse
Affiliation(s)
- Robert W Fulton
- Department of Veterinary Pathobiology (Fulton, Ore, Confer, Saliki, Burge), Room 250 McElroy Hall, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK 74078, USA.
| | | | | | | | | | | | | |
Collapse
|
41
|
Antonis AFG, Bouma A, de Bree J, de Jong MCM. Comparison of the sensitivity of in vitro and in vivo tests for detection of the presence of a bovine viral diarrhoea virus type 1 strain. Vet Microbiol 2005; 102:131-40. [PMID: 15327789 DOI: 10.1016/j.vetmic.2004.05.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2003] [Revised: 04/26/2004] [Accepted: 05/10/2004] [Indexed: 10/26/2022]
Abstract
Veterinary vaccines are usually tested for the absence of contaminants. However, the quality control does not always imply that vaccines are not contaminated as, for example, illustrated by the bovine herpes virus 1 (BHV1) vaccine used in The Netherlands in 1999 that contained a small amount of bovine viral diarrhoea virus (BVDV1). Thousands of cows were vaccinated with BHV1 vaccine batches, and the question arose as to whether these small amounts of BVDV1, most likely not detected with in vitro tests, could have infected cattle. More in general, the question was whether the outcome of the in vitro tests, i.e. the in vitro infectivity, was indicative for the infectivity for cattle, i.e. the in vivo infectivity. We therefore carried out in vitro experiments to determine the sensitivity of a BVDV1 isolation assay. In addition, we performed two animal experiments, in which we estimated the lowest dose needed to infect calves with BVDV1. We extrapolated the experimental in vitro and in vivo results from a tissue culture infectious dose (TCID50) to a cattle infectious dose (CID50). We observed a partial response in the calves inoculated with this dose: four out of six calves turned out to be infected. In the tissue culture test, all 20 samples tested negative. The response in vivo, however, was not significantly higher than the in vitro response, which implies that no difference in susceptibility was observed between the animal test and the tissue culture test. Based on the results in our experiments, some cattle may have been infected with BVDV1 after the application of the contaminated BHV1 vaccine during the vaccination campaign. The question remains that how many cattle received contaminated vaccine, and became infected with BVDV1.
Collapse
Affiliation(s)
- Adriaan F G Antonis
- Division of Infectious Diseases and Food Chain Quality, Animal Sciences Group, Wageningen University and Research Centre (WUR), P.O. Box 65, Lelystad AB8200, The Netherlands.
| | | | | | | |
Collapse
|
42
|
Vilcek S, Ridpath JF, Van Campen H, Cavender JL, Warg J. Characterization of a novel pestivirus originating from a pronghorn antelope. Virus Res 2005; 108:187-93. [PMID: 15681069 DOI: 10.1016/j.virusres.2004.09.010] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2003] [Revised: 09/22/2004] [Accepted: 09/22/2004] [Indexed: 11/16/2022]
Abstract
A unique pestivirus, isolated from a pronghorn antelope (Antilocopra americana), was characterized. Serum neutralization studies suggested that this virus was antigenically related to pestiviruses. Genomic characteristics, unique to pestiviruses, indicated that this virus belongs to the Pestivirus genus. These characteristics included the organization of the 5' untranslated region (5'-UTR), the presence and length of a viral Npro coding region, conservation of cysteine residues in Npro, conservation of predicted amino acid sequences flanking the cleavage sites between viral polypeptides Npro and C and between C and Erns and conservation of predicted hydrophobicity plots of Npro protein. While this data indicated the virus belongs to the Pestivirus genus, phylogenetic analysis in 5'-UTR, Npro and E2 regions suggested that it is the most divergent of the pestiviruses identified to date. This conclusion was also supported by the amino acid identity in coding regions. The corresponding values were much lower for the comparison of pronghorn pestivirus to other pestivirus genotypes than only between previous recognized genotypes. These results suggest the virus isolated from pronghorn antelope represents a new pestivirus genotype. It also represents the only pestivirus genotype first isolated from New World wildlife.
Collapse
Affiliation(s)
- S Vilcek
- University of Veterinary Medicine, Department of Parasitology and Infectious Diseases, Komenskeho 73, 04181 Kosice, Slovakia.
| | | | | | | | | |
Collapse
|
43
|
Arnal M, Fernández-de-Luco D, Riba L, Maley M, Gilray J, Willoughby K, Vilcek S, Nettleton PF. A novel pestivirus associated with deaths in Pyrenean chamois (Rupicapra pyrenaica pyrenaica). J Gen Virol 2004; 85:3653-3657. [PMID: 15557238 DOI: 10.1099/vir.0.80235-0] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During investigations into recent population decreases in Pyrenean chamois (Rupicapra pyrenaica pyrenaica) 21 animals found dead or dying were necropsied. Immunohistochemistry revealed the presence of a pestivirus in organs from two of the 21 chamois. From one of these animals a pestivirus was isolated from the spleen, skin and serum. The virus had better growth in ovine than in bovine cells and was neutralized most effectively by an anti-border disease virus (BDV) reference antiserum. Using panpestivirus and genotype-specific primers selected from 5'-untranslated region (UTR) of the pestivirus genome, BDV RNA was demonstrated by RT-PCR. Comparison of the chamois sequences from 5'-UTR, entire N(pro) and E2 gene coding regions with those of other pestivirus genotypes revealed that this virus did not fall into any of the pestivirus genotypes identified so far. Results of phylogenetic analysis suggested that the chamois pestivirus was closely related to BDV and it was typed as BDV-4 genotype.
Collapse
Affiliation(s)
- MaríaCruz Arnal
- Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Zaragoza, Spain
| | | | - Landry Riba
- Departament de Medi Ambient, Principality of Andorra
| | - Maddy Maley
- Moredun Research Institute, Bush Loan, Penicuik, Edinburgh, Scotland EH26 0PZ, UK
| | - Janice Gilray
- Moredun Research Institute, Bush Loan, Penicuik, Edinburgh, Scotland EH26 0PZ, UK
| | - Kim Willoughby
- Moredun Research Institute, Bush Loan, Penicuik, Edinburgh, Scotland EH26 0PZ, UK
| | - Stefan Vilcek
- Department of Parasitology and Infectious Diseases, University of Veterinary Medicine, Komenskeho 73, 041 81 Kosice, Slovakia
| | - Peter F Nettleton
- Moredun Research Institute, Bush Loan, Penicuik, Edinburgh, Scotland EH26 0PZ, UK
| |
Collapse
|
44
|
Schirrmeier H, Strebelow G, Depner K, Hoffmann B, Beer M. Genetic and antigenic characterization of an atypical pestivirus isolate, a putative member of a novel pestivirus species. J Gen Virol 2004; 85:3647-3652. [PMID: 15557237 DOI: 10.1099/vir.0.80238-0] [Citation(s) in RCA: 188] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The genus Pestivirus within the family Flaviviridae currently consists of four different main species: Classical swine fever virus, Bovine viral diarrhea virus types 1 and 2 and Border disease virus. A fifth tentative species is represented by an isolate from a giraffe. In this study, a completely new pestivirus, isolated from a batch of fetal calf serum that was collected in Brazil, is described. It is proposed that the isolate D32/00_'HoBi' may constitute a novel sixth pestivirus species, because it is genetically, as well as antigenically, markedly different from all other pestiviruses. Based on the entire N(pro)- and E2-encoding sequences, identities of <70 % to all other pestivirus species were determined. Similarly, cross-neutralization and binding studies using antisera and mAbs revealed marked antigenic differences between D32/00_'HoBi' and all other pestiviruses.
Collapse
Affiliation(s)
- Horst Schirrmeier
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
| | - Günther Strebelow
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
| | - Klaus Depner
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
| | - Bernd Hoffmann
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
| | - Martin Beer
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
| |
Collapse
|
45
|
Amiridis GS, Billinis C, Papanikolaou T, Psychas V, Kanteres D. Postparturient outbreak of fatal bovine viral diarrhoea in imported pregnant heifers on a dairy farm in Greece. Vet Rec 2004; 154:698-9. [PMID: 15200079 DOI: 10.1136/vr.154.22.698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- G S Amiridis
- Department of Obstetrics and Reproduction, Faculty of Veterinary Medicine, University of Thessaly, PO Box 199, GR-43100 Karditsa, Greece
| | | | | | | | | |
Collapse
|
46
|
Park JS, Moon HJ, Lee BC, Hwang WS, Yoo HS, Kim DY, Park BK. Comparative analysis on the 5'-untranslated region of bovine viral diarrhea virus isolated in Korea. Res Vet Sci 2004; 76:157-63. [PMID: 14672860 PMCID: PMC7127663 DOI: 10.1016/j.rvsc.2003.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Samples of 249 bovine abortuses, one intestine, and four diarrheal stools from 254 cows were collected, and bovine viral diarrhea virus (BVDV) was detected by reverse transcription-polymerase chain reaction (RT-PCR). Subsequently, virus isolation was preformed with PCR-positive samples, and then PCR product of 5′-untranslated region (UTR) of BVDV isolate was sequenced and analyzed. Among the samples collected, 20 (from 17 bovine abortuses, one intestine, and two diarrheal stools) were positive for BVDV RT-PCR; four BVDVs (from two bovine abortuses, one intestine, and one diarrheal stool) were isolated. When the four isolates were biotyped in cell culture, one BVDV isolate from a bovine abortus was cytopathic and the others were non-cytopathic. In addition, three isolates were genotyped as BVDV-1 and one isolate from a diarrheal stool as BVDV-2. In phylogenetic analysis, it suggested that the BVDV-2 isolate in Korea is closer to the North American strains than Asian strains. This is the first report on the identification and isolation of BVDV-2 in Korea.
Collapse
Affiliation(s)
- J S Park
- Department of Veterinary Medicine Virology Lab, The Xenotransplantation Research Center, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, 151-742, Seoul, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
47
|
Nagai M, Hayashi M, Sugita S, Sakoda Y, Mori M, Murakami T, Ozawa T, Yamada N, Akashi H. Phylogenetic analysis of bovine viral diarrhea viruses using five different genetic regions. Virus Res 2004; 99:103-13. [PMID: 14749175 DOI: 10.1016/j.virusres.2003.10.006] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Phylogenetic analysis of the five different regions (5' non-coding region (5'NCR), N(pro), E2, NS3 and NS5B-3'NCR) of 48 Japanese and reported bovine viral diarrhea virus (BVDV) genomes was performed. Japanese BVDVs were segregated into BVDV1 subdivided into six subgroups and BVDV2. One isolate, So CP/75, isolated in 1975 and previously proposed as subgroup 1e according to its 5'NCR sequence, was quite unique and formed an independent lineage in the tree of any region. Another isolate, 190CP, obtained from an experimental mucosal disease case was classified as subgroup 1e, defined by Becher et al. in the 5'NCR, N(pro) and E2 regions, whereas it was classified as subgroup 1a in the NS5B-3'NCR region. The genomic sequences of the American isolates ILLC and ILLNC obtained from the GenBank database were assigned into subgroup 1b in the 5'NCR, N(pro), E2 and NS5B-3'NCR regions, whereas they were assigned into subgroup 1a in the NS3 region, suggesting that recombination between the virus strains classified into different subgroups had occurred in an animal. These findings suggest that phylogenetic analysis of several genetic regions is useful for the further characterization of field BVDV isolates.
Collapse
Affiliation(s)
- Makoto Nagai
- Ishikawa Hokubu Livestock Hygiene Service Center, Taturuhama, 929-2126, Ishikawa, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Tajima M. Bovine viral diarrhea virus 1 is classified into different subgenotypes depending on the analyzed region within the viral genome. Vet Microbiol 2004; 99:131-8. [PMID: 15019104 DOI: 10.1016/j.vetmic.2003.11.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2003] [Revised: 11/12/2003] [Accepted: 11/26/2003] [Indexed: 10/26/2022]
Abstract
Phylogenetic analyses of bovine viral diarrhea virus (BVDV) were performed based on the nucleotide sequences of the 5' untranslated region (5'-UTR) and E2-coding gene. Thirty-six BVDV detected from naturally infected cattle in the northern region of Japan were divided into three genotypes, BVDV1a, BVDV1b and BVDV2, in a 5'-UTR phylogenetic tree. In a phylogenetic tree constructed from the E2-coding gene, BVDV1c was identified and the viruses classified in BVDV1c were included in BVDV1a in the 5'-UTR phylogenetic tree. Moreover, BVDV1a and BVDV1b in the E2-phylogenetic tree clustered closer together than in the 5'-UTR tree. These results suggested that phylogenetic analysis of the E2 gene was more useful for identification of subgenotypes within BVDV1.
Collapse
Affiliation(s)
- Motoshi Tajima
- Graduate School of Veterinary Medicine, Veterinary Teaching Hospital, Hokkaido University, Sapporo 060-0818, Japan.
| |
Collapse
|
49
|
Falcone E, Cordioli P, Tarantino M, Muscillo M, La Rosa G, Tollis M. Genetic heterogeneity of bovine viral diarrhoea virus in Italy. Vet Res Commun 2003; 27:485-94. [PMID: 14582747 DOI: 10.1023/a:1025793708771] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The genetic characteristics, of 38 field isolates of bovine viral diarrhoea virus (BVDV) collected in 1999 from sick or healthy and persistently infected cattle of dairy farms situated in northern Italy, were investigated. A partial 5'-untranslated region (5'-UTR) sequence of each isolate was determined and a phylogenetic analysis was performed. All the isolates were classified as belonging to the BVDV-1 genotype and could be assigned to different BVDV-1 groups, namely BVDV-1b (n = 20), BVDV-1d (n = 6) and BVDV-1e (n = 10). Two remaining isolates could be classified as BVDV-1f and BVDV-1h, respectively. These results provided evidence for genetic heterogeneity of BVDV in Italy, and contribute to a better knowledge of the circulation of BVDV strains, and to their classification.
Collapse
Affiliation(s)
- E Falcone
- Istituto Superiore di Sanità, Laboratorio di Medicina Veterinaria, Viale R. Elena 299, 00161 Roma, Italy
| | | | | | | | | | | |
Collapse
|
50
|
Hamers C, Couvreur B, Dehan P, Letellier C, Fischer L, Brun AJ, Lewalle P, Michaux C, Pastoret PP, Kerkhofs P. Assessment of the clinical and virological protection provided by a commercial inactivated bovine viral diarrhoea virus genotype 1 vaccine against a BVDV genotype 2 challenge. Vet Rec 2003; 153:236-40. [PMID: 13677324 DOI: 10.1136/vr.153.8.236] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
A new genotype of bovine viral diarrhoea virus (BVDV), designated BVDV-2, has emerged in the last decade and in recent years the prevalence of BVDV-2 strains has increased. A vaccination-challenge study was carried out to determine the cross-protective efficacy of a commercial inactivated vaccine containing a BVDV-1 strain. A group of five BVDV-free calves was vaccinated twice and a second group of five calves served as negative controls. Two months after the first vaccination, all the calves were challenged intranasally with BVDV-2 strain BVD890. The clinical signs of disease, the changes in haematological variables and the level of viraemia were significantly less in the vaccinated group.
Collapse
Affiliation(s)
- C Hamers
- Department of Infectious Disease, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster 20, B-4000 Liège, Belgium
| | | | | | | | | | | | | | | | | | | |
Collapse
|