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Bulcha B, Tesfaye A, Garoma A, Begna F. Seroprevalence of and Associated Risk Factors for Bovine Viral Diarrhea in Dairy Cattle in and Around Nekemte Town, East Wallaga, Oromiya Regional State, Ethiopia. BIOMED RESEARCH INTERNATIONAL 2025; 2025:1709145. [PMID: 39817271 PMCID: PMC11729507 DOI: 10.1155/bmri/1709145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Accepted: 12/10/2024] [Indexed: 01/18/2025]
Abstract
Bovine viral diarrhea virus (BVDV) is an important pathogen affecting dairy cattle all over the world by causing significant economic losses due to reproductive and respiratory problems, immunosuppressive effects, increased risk of morbidity, and calf mortality. A cross-sectional study was conducted from February 2021 to August 2021 to determine the seroprevalence of bovine viral diarrhea (BVD) and identify risk factors associated with its occurrence in and around Nekemte Town of Ethiopia. Blood samples were collected from 305 dairy cattle of 41 herds by using cluster-sampling method. All sampled animals were identified by their age, breeds, origin, parity, pregnancy status, and history of reproductive and respiratory problems. Competitive ELISA was used in the laboratory to detect the presence of antibodies in the serum. At the animal and herd level, descriptive statistics were utilized to assess the amount of BVDV viral antibody circulation, and multivariable logistic regression analysis was employed to detect potential risk variables. The result demonstrates 9.84% (95% confidence interval (CI): 6.49-13.18) and 28.52% (95% CI: 23.46-33.59) seroprevalence of BVDV antibody at individual and herd level, respectively. Abortion (odds ratio (OR) = 2.75; p = 0.019), retention of fetal membrane (OR = 3.33; p = 0.011), purchasing of animals (OR = 2.98; p = 0.017), and pregnancy (OR = 3.16; p = 0.019) were variables significantly associated with the seropositivity of BVDV. Herd size was found to be substantially linked with BVDV infection at the herd level (p = 0.009). These moderate seroprevalence of BVDV results indicate that the virus is widely spread among dairy cattle at various farms in and around Nekemte Town, hurting dairy farm production and productivity. To reduce the seroprevalence of this infectious agent, cows with a history of reproductive disorders should be tested, and new animals should be quarantined before being introduced into herds, and more research should be done to assess the impact of reproductive failure and other effects associated with this virus.
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Affiliation(s)
- Begna Bulcha
- Department of CLiS, School of Veterinary Medicine, Wallaga University, Nekemte, Ethiopia
| | | | | | - Feyisa Begna
- College of Agriculture and Veterinary Medicine, Jimma University, Jimma, Ethiopia
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Pandolfi IA, de Oliveira WA, Martins-Filho OA, de Araújo FF, da Costa Rocha IA, Bittar ER, Araújo MSS, Bittar JFF. The seasonality as a relevant aspect to be considered for differential diagnosis of Trypanosoma vivax infection and co-infections in female cattle. Comp Immunol Microbiol Infect Dis 2024; 109:102180. [PMID: 38653007 DOI: 10.1016/j.cimid.2024.102180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 04/04/2024] [Accepted: 04/14/2024] [Indexed: 04/25/2024]
Abstract
Bovine Trypanosomiasis and other infectious diseases cause relevant loss for the livestock industry impacting productive/reproductive indices. This study intended to better understand the frequency, seasonality, and profile of infections associated with Bovine Trypanosomiasis. A total of 1443 serum samples were screened for T. vivax infection and other infectious diseases: Neosporosis, Leptospirosis, Bovine Leukosis Virus infection/(BLV), Infectious Bovine Rhinotracheitis/(IBR) or Bovine Viral Diarrhea/(BVD). Distinct methods were used for screening and diagnosis: immunofluorescence assay (Trypanosomiasis), ELISA (Neosporosis,BLV,IBR,BVD) and microscopic agglutination test (Leptospirosis). Our findings demonstrated that the seropositivity for Trypanosomiasis=57% was similar to Neosporosis=55%, higher than Leptospirosis=39% and BVL=34%, but lower than IBR=88% and BVD=71%. The seropositivity for Trypanosomiasis was higher in the autumn and lower in the winter. Regardless the season, the IBR seropositivity (min=73%;max=95%) was higher than Trypanosomiasis (min=48%;max=68%). Moreover, Neosporosis (min=71%;max=100%) and BVD (min=65%;max=76%) were more frequent than Trypanosomiasis in the summer, winter and spring. The diagnosis outcome revealed that Trypanosomiasis&IBR=43% and Trypanosomiasis&Neosporosis=35% were the most frequent co-infections with higher seropositivity in the autumn (58%) and summer (80%), respectively. Noteworthy, high seropositivity to Trypanosomiasis&BVD was registered in the autumn (46%). Together, our data re-enforce the relevance of differential diagnosis between Trypanosomiasis with other bovine infectious diseases and that differences in the seasonality profile is a relevant aspect to be considered while selecting the differential diagnosis to be applied.
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Affiliation(s)
- Izabela Andrade Pandolfi
- Universidade de Uberaba (UNIUBE), Medicina Veterinária, Mestrado em Sanidade e Produção Animal nos Trópicos, Uberaba, Minas Gerais, Brazil
| | - Wallacy Augusto de Oliveira
- Universidade de Uberaba (UNIUBE), Medicina Veterinária, Mestrado em Sanidade e Produção Animal nos Trópicos, Uberaba, Minas Gerais, Brazil
| | - Olindo Assis Martins-Filho
- Grupo Integrado de Pesquisa em Biomarcadores, Instituto René Rachou - Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Fernanda Fortes de Araújo
- Grupo Integrado de Pesquisa em Biomarcadores, Instituto René Rachou - Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Ismael Artur da Costa Rocha
- Grupo Integrado de Pesquisa em Biomarcadores, Instituto René Rachou - Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Eustáquio Resende Bittar
- Universidade de Uberaba (UNIUBE), Medicina Veterinária, Mestrado em Sanidade e Produção Animal nos Trópicos, Uberaba, Minas Gerais, Brazil
| | - Marcio Sobreira Silva Araújo
- Grupo Integrado de Pesquisa em Biomarcadores, Instituto René Rachou - Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil.
| | - Joely Ferreira Figueiredo Bittar
- Universidade de Uberaba (UNIUBE), Medicina Veterinária, Mestrado em Sanidade e Produção Animal nos Trópicos, Uberaba, Minas Gerais, Brazil
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Mucellini CI, Silva Júnior JVJ, de Oliveira PSB, Weiblen R, Flores EF. Novel genomic targets for proper subtyping of bovine viral diarrhea virus 1 (BVDV-1) and BVDV-2. Virus Genes 2023; 59:836-844. [PMID: 37589803 DOI: 10.1007/s11262-023-02022-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 07/20/2023] [Indexed: 08/18/2023]
Abstract
Whole-genome phylogenetic analysis, the most suitable strategy for subtyping bovine viral diarrhea virus 1 (BVDV-1) and BVDV-2, is not feasible for many laboratories. Consequently, BVDV isolates/strains have been frequently subtyped based on analysis of single genomic regions, mainly the 5' untranslated region (UTR). This approach, however, may lead to inaccurate and/or poorly statistically supported viral classification. Herein, we describe novel primer sets whose amplicons may be easily sequenced and used for BVDV subtyping. Initially, genomic regions previously described as the most suitable targets for BVDV subtyping were analyzed for design of high-coverage primers. The putative amplicons were analyzed in silico for their suitability to reproduce the phylogenetic classification of 118 BVDV-1 and 88 BVDV-2 complete/near-complete genomes (CNCGs) (GenBank). This analysis was also performed considering the region amplifiable by primers HCV90-368, 324-326 and BP189-389 (5'UTR), which have been used for BVDV diagnosis and/or classification. After confirming the agreement between the analyses of our primers' amplicon versus the CNCGs, we optimized the RT-PCRs and evaluated their performance for amplification of BVDV isolates/strains (n = 35 for BVDV-1; n = 33 for BVDV-2). Among the potential targets for BVDV subtyping, we designed high-coverage primers for NS3-NS4A (BVDV-1) (526 bp amplicon) and NS5B (BVDV-2) (728 bp). The classification based on these regions fully reproduced the subtyping of all CNCGs. On the other hand, subtyping based on the putative amplicons from primers HCV90-368, 324-326 and BP189-389 showed disagreements in relation the CNCG analysis. The NS3-NS4A and NS5B primers also allowed the amplification of all BVDV isolates/strains tested. Finally, we suggest the use of these primers in future phylogenetic and epidemiological studies of BVDVs.
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Affiliation(s)
- Carolina Isabela Mucellini
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Av. Roraima, 1000, Prédio 63A, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil
- Programa de Pós-graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - José Valter Joaquim Silva Júnior
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Av. Roraima, 1000, Prédio 63A, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil
- Setor de Virologia, Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Departamento de Análises Clínicas, Centro de Ciências da Saúde, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Pablo Sebastian Britto de Oliveira
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Av. Roraima, 1000, Prédio 63A, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil
- Programa de Pós-graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Rudi Weiblen
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Av. Roraima, 1000, Prédio 63A, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil
| | - Eduardo Furtado Flores
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Av. Roraima, 1000, Prédio 63A, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil.
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Werid GM, Hemmatzadeh F, Miller D, Reichel MP, Messele YE, Petrovski K. Comparative Analysis of the Prevalence of Bovine Viral Diarrhea Virus in Cattle Populations Based on Detection Methods: A Systematic Review and Meta-Analysis. Pathogens 2023; 12:1067. [PMID: 37624027 PMCID: PMC10459101 DOI: 10.3390/pathogens12081067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 08/12/2023] [Accepted: 08/18/2023] [Indexed: 08/26/2023] Open
Abstract
Infectious diseases of cattle, including bovine viral diarrhea (BVD), pose a significant health threat to the global livestock industry. This study aimed to investigate the prevalence and risk factors associated with bovine viral diarrhea virus (BVDV) infections in cattle populations through a systematic review and meta-analysis. PubMed, Web of Science, and Scopus were systematically searched for relevant articles reporting the prevalence of and associated risk factors in studies published between 1 January 2000 and 3 February 2023. From a total of 5111 studies screened, 318 studies were included in the final analysis. BVDV prevalence in cattle populations was estimated using various detection methods. The analysis detected heterogeneity in prevalence, attributed to detection techniques and associated risk factors. Antibody detection methods exhibited a higher prevalence of 0.43, reflecting the cumulative effect of detecting both active and past infections. Antigen detection methods showed a prevalence of 0.05, which was lower than antibody methods. A prevalence of 0.08 was observed using nucleic acid detection methods. The health status of the examined cattle significantly influenced the prevalence of BVDV. Cattle with bovine respiratory disease complex (BRDC) exhibited higher antibody (prevalence of 0.67) and antigen (prevalence 0.23) levels compared to cattle with reproductive problems (prevalence 0.13) or diarrhea (prevalence 0.01). Nucleic acid detection methods demonstrated consistent rates across different health conditions. Age of cattle influenced prevalence, with higher rates in adults compared to calves. Risk factors related to breeding and reproduction, such as natural or extensive breeding and a history of abortion, were associated with increased prevalence. Coinfections with pathogens like bovine herpesvirus-1 or Neospora caninum were linked to higher BVDV prevalence. Management practices, such as commingling, introducing new cattle, and direct contact with neighboring farms, also influenced prevalence. Herd attributes, including larger herd size, and the presence of persistently infected cattle, were associated with higher prevalence. These findings indicated the importance of detection methods and risk factors in BVDV epidemiological studies.
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Affiliation(s)
- Gebremeskel Mamu Werid
- Davies Livestock Research Centre, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia; (G.M.W.); (D.M.); (Y.E.M.)
| | - Farhid Hemmatzadeh
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia;
| | - Darren Miller
- Davies Livestock Research Centre, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia; (G.M.W.); (D.M.); (Y.E.M.)
| | - Michael P. Reichel
- Department of Population Medicine and Diagnostic Sciences, Cornell University College of Veterinary Medicine, Ithaca, NY 14853, USA;
| | - Yohannes E. Messele
- Davies Livestock Research Centre, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia; (G.M.W.); (D.M.); (Y.E.M.)
| | - Kiro Petrovski
- Davies Livestock Research Centre, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia; (G.M.W.); (D.M.); (Y.E.M.)
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia;
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Maia ARA, Bezerra RA, Silva SS, Álvares FBV, Santos CDSAB, Alves CJ, Clementino IJ, Feitosa TF, Vilela VLR, Azevedo SSD. Herd-level based seroprevalence and associated factors for Toxoplasma gondii in cows in the state of Paraíba, Northeastern Brazil. REVISTA BRASILEIRA DE PARASITOLOGIA VETERINARIA = BRAZILIAN JOURNAL OF VETERINARY PARASITOLOGY : ORGAO OFICIAL DO COLEGIO BRASILEIRO DE PARASITOLOGIA VETERINARIA 2023; 32:e017222. [PMID: 37194788 DOI: 10.1590/s1984-29612023025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 04/03/2023] [Indexed: 05/18/2023]
Abstract
We aimed to determine the herd and animal levels seroprevalence and associated factors for Toxoplasma gondii infections in cattle from the state of Paraíba, Northeastern Brazil. Herds (n = 434) and cows aged ≥ 24 months (n = 1,895) were randomly selected, and serum samples were tested with the immunofluorescence antibody test (IFAT) using as cutoff of 64. Of the 434 farms investigated, 197 had at least one seropositive cow (prevalence of 49.0%; 95% CI = 44.3%-53.8%), and the prevalence at animal level was 18.0% (95% CI = 5.3%-21.1%). The antibody titers ranged from 64 to 1024, with the most frequent titers being 64 (10.8%) and 128 (3.7%). The risk factors identified were property located in Sertão region (odds ratio [OR] = 3.07), property located in Agreste/Zona da Mata regions (OR = 2.00), animal purchasing (OR = 2.68), herd size of 34-111 animals (OR = 2.91) and herd size > 111 animals (OR = 6.97). The results suggest the wide distribution of T. gondii infections in cattle throughout the state of Paraíba, and the risk factors identified are not possible to correct.
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Affiliation(s)
- Amanda Rafaela Alves Maia
- Unidade Acadêmica de Medicina Veterinária, Centro de Saúde e Tecnologia Rural, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil
| | - Roberto Alves Bezerra
- Laboratório de Imunologia e Doenças Infectocontagiosas, Instituto Federal da Paraíba - IFPB, Sousa, PB, Brasil
| | - Samara Santos Silva
- Laboratório de Imunologia e Doenças Infectocontagiosas, Instituto Federal da Paraíba - IFPB, Sousa, PB, Brasil
| | | | | | - Clebert José Alves
- Unidade Acadêmica de Medicina Veterinária, Centro de Saúde e Tecnologia Rural, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil
| | - Inácio José Clementino
- Departamento de Medicina Veterinária, Centro de Ciências Agrárias, Universidade Federal da Paraíba - UFPB, Areia, PB, Brasil
| | - Thais Ferreira Feitosa
- Laboratório de Imunologia e Doenças Infectocontagiosas, Instituto Federal da Paraíba - IFPB, Sousa, PB, Brasil
| | | | - Sérgio Santos de Azevedo
- Unidade Acadêmica de Medicina Veterinária, Centro de Saúde e Tecnologia Rural, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil
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Zirra-Shallangwa B, González Gordon L, Hernandez-Castro LE, Cook EAJ, Bronsvoort BMDC, Kelly RF. The Epidemiology of Bovine Viral Diarrhea Virus in Low- and Middle-Income Countries: A Systematic Review and Meta-Analysis. Front Vet Sci 2022; 9:947515. [PMID: 36032291 PMCID: PMC9404877 DOI: 10.3389/fvets.2022.947515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 06/23/2022] [Indexed: 11/13/2022] Open
Abstract
Introduction Bovine viral diarrhea virus (BVDV) causes reproductive inefficiencies and negatively impacts the economy of low- and middle-income countries (LMICs). It is characterized by a combination of syndromes that result in poor production performance and calf morbidity and mortality. BVDV control is possible by introduction of biosecurity measures, test-and-cull, and vaccination programs as accomplished in high-income countries. Knowledge of BVDV epidemiology is limited in many LMICs, which hinders implementation of effective control programs. We carried out a systematic review and meta-analysis to estimate the burden of BVDV, identify risk factors related to its occurrence, and health and economic impacts on production systems. Materials and Methods Relevant BVD articles were collated from library databases; 690 abstracts and full texts were found in an initial search followed by filtering of 59 manuscripts. We accounted for quality and risk of bias in the meta-analysis. Prevalence, exposure, and current infection at regional, production, and farming system levels were estimated using logistic random-effects meta-regression models. Finally, we calculated the proportion of studies that addressed risk factors and health and economic impacts across different production systems to inform future preventative strategies in LMICs. Results Seroprevalence was high and varied between regions. Mean weighted prevalence was 39.5% (95% CI 25-56.1), 45.2% (95% CI 35.9-54.8), 49.9% (95% CI 25.5-74.3), and 21.6% (95% CI 0.5-56) for sub-Saharan Africa, South America, Middle East, and Asia, respectively. Seroprevalence varied across farming systems, with smallholder farming showing the highest values. Herdsize was the most frequently reported risk factor, and the percentage of articles that reported herdsize as a risk factor were 20.6%, 33.3%, and 38.4% for dairy, beef and mixed systems respectively. Abortion (13.7% of articles) was the main reported health impact in dairy systems. Some articles reported milk drop (4.6% of articles), but no article investigated the economic cost of BVDV in farming systems. Conclusion Animal-level seroprevalence varied across all regions. Most of the studies focused on BVDV seroprevalence. There were some articles that investigated risk factors and health impacts, and there were even less that investigated economic impacts. Future studies should focus on identifying risk factors and quantifying health and economic impacts across systems. Understanding these aspects is crucial to develop management strategies to apply across diverse production systems in LMICs.
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Affiliation(s)
- Bibiana Zirra-Shallangwa
- The Royal (Dick) School of Veterinary Studies, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Lina González Gordon
- The Royal (Dick) School of Veterinary Studies, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Luis E. Hernandez-Castro
- The Royal (Dick) School of Veterinary Studies, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Elizabeth A. J. Cook
- Centre for Tropical Livestock Genetics and Health, International Livestock Research Institute, Nairobi, Kenya
| | - Barend M. de Clare Bronsvoort
- The Royal (Dick) School of Veterinary Studies, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Robert F. Kelly
- The Royal (Dick) School of Veterinary Studies, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
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Karimi O, Bitaraf Sani M, Bakhshesh M, Harofteh JZ, Poormirzayee H. Seroprevalence of bovine viral diarrhea virus antibodies and risk factors in dairy cattle from the central desert of Iran. Trop Anim Health Prod 2022; 54:176. [PMID: 35503381 DOI: 10.1007/s11250-022-03180-0] [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: 12/30/2021] [Accepted: 04/22/2022] [Indexed: 10/18/2022]
Abstract
Bovine viral diarrhea virus (BVDV) infects cattle worldwide and causes one of the most important economic diseases of the dairy industry. BVDV infection reduces reproductive efficiency, suppresses the immune system, and causes gastrointestinal and respiratory diseases. A first cross-sectional study was conducted in the central desert of Iran (Yazd and South Khorasan provinces) to estimate the seroprevalence and identify BVDV-related risk factors in dairy cattle. A total of 800 cows were randomly selected of 76 herds, and their serum samples were tested by the indirect enzyme-linked immunosorbent assay (ELISA) method for BVDV antibody detection. Data were analyzed using the logistic regression model. The serum prevalence of BVDV at animal and herd levels was 66.83% and 91.6%, respectively. Traditional housing system (OR = 3.22; 95% CI = 1.20-9.09) and cattle introduction to the herd (OR = 2.12; 95% CI = 1.21-3.70) were the important risk factors for BVDV seropositivity (p < 0.05). Increasing of age per year caused adding in 0.33 log (odds) of BVDV seropositivity (p < 0.05). It is necessary to implement control and eradication programs because of the high seroprevalence at the individual level and at the herd in the central desert of Iran.
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Affiliation(s)
- Omid Karimi
- Department of Animal Viral Diseases Research, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran.
| | - Morteza Bitaraf Sani
- Animal Science Research Department, Yazd Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education & Extension Organization (AREEO), Yazd, Iran
| | - Mehran Bakhshesh
- Department of Animal Viral Diseases Research, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran
| | - Javad Zareh Harofteh
- Animal Science Research Department, Yazd Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education & Extension Organization (AREEO), Yazd, Iran
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Demil E, Fentie T, Vidal G, Jackson W, Lane J, Mekonnen SA, Smith W. Prevalence of bovine viral diarrhea virus antibodies and risk factors in dairy cattle in Gondar city, Northwest Ethiopia. Prev Vet Med 2021; 191:105363. [PMID: 33933916 DOI: 10.1016/j.prevetmed.2021.105363] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 04/05/2021] [Accepted: 04/19/2021] [Indexed: 01/27/2023]
Abstract
Bovine viral diarrhea (BVD) is a disease that affects cattle and other ruminants worldwide and causes considerable economic losses. A cross-sectional study was carried out between December 2017 and July 2018 with the aim to estimate the prevalence of Bovine Viral Diarrhea virus (BVDV) antibodies and to identify potential risk factors associated with the occurrence of the disease in dairy cattle in peri-urban areas of Gondar city, Northwest Ethiopia. A total of 339 serum samples obtained from randomly selected dairy cattle aged 6 months and older were assayed using a BVDV antibody competitive-Enzyme Linked Immunosorbent Assay (c-ELISA) kit. Descriptive statistics were used to estimate antibody prevalence of BVDV at animal and herd-level and logistic regression was used to identify potential risk factors. The study findings showed that the animal-level antibody prevalence of BVDV in the study area was 26.84 % (95 % CI: 22.1 %-31.6 %) and the herd-level seroprevalence was 68.3 % (95 % CI: 56.2 %-80.4 %). Logistic regression model demonstrated that age >2 years (OR = 4.75, 95 % CI: 2.20-10.26), herd size >11 (OR = 7.28, 95 % CI: 2.50-21.22), and poor farm hygiene (OR = 3.69, 95 % CI: 1.94-7.02), are potential risk factors associated with BVDV infection (P < 0.05). However, sex, faecal consistency and housing system were not associated with BVDV serostatus. The animal- and herd-level seroprevalence reports in Northwest Ethiopia can serve as a baseline finding for future BVD epidemiological investigations and to inform future control programs in the study region.
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Affiliation(s)
- Endeshaw Demil
- Bahir Dar Animal Health Investigation and Diagnostic Laboratory, P.O. Box 70, Bahir Dar, Ethiopia.
| | - Tsegaw Fentie
- College of Veterinary Medicine and Animal Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
| | - Gema Vidal
- One Health Institute, School of Veterinary Medicine, University of California, Davis, USA
| | - Wendi Jackson
- California Animal Health and Food Safety Laboratory, School of Veterinary Medicine, University of California, Davis, USA
| | - Jennifer Lane
- One Health Institute, School of Veterinary Medicine, University of California, Davis, USA
| | - Sefinew Alemu Mekonnen
- College of Veterinary Medicine and Animal Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
| | - Woutrina Smith
- One Health Institute, School of Veterinary Medicine, University of California, Davis, USA
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Ortega DO, Sarmiento RAM, Torreglosa JCT, Rocha JF. Prevalence and risk factors of bovine viral diarrhea in Colombian cattle. Vet World 2020; 13:1487-1494. [PMID: 33061218 PMCID: PMC7522956 DOI: 10.14202/vetworld.2020.1487-1494] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 06/01/2020] [Indexed: 12/13/2022] Open
Abstract
Background and Aim: Bovine viral diarrhea virus (BVDV) is present in most cattle-raising countries around the world, and it has a negative economic impact in cattle herds. In Colombia, previous studies have estimated the prevalence of BVDV in specific locations. The aim of this study was to estimate the prevalence of BVDV in cattle herds located at several municipalities across the country and to identify the associated risk and protective factors. Materials and Methods: A cross-sectional study was carried out to investigate the prevalence of BVDV in Colombian cattle populations at farm and animal-levels. A total of 387 herds and 8110 animals located in seven different departments were included in this study. Results: An animal- and farm-level prevalence of 36% and 69%, respectively, were estimated. A high variation for the farm-level prevalence was found among the municipalities studied. Moreover, seropositive cattle to the infectious bovine rhinotracheitis virus (odds ratio (OR)=2.38, p=0.0479) and Neospora caninum (OR=3.15, p=0.0122) were more likely to be seropositive for BVDV, while the practice of burning dead animals at the farm was identified as a protective factor (OR=0.17, p=0.014). Conclusion: The prevalence of BVDV varied more at farm-level compared to animal-level. Two risk factors and one protective factor were identified. The results of the current study are essential to understand the epidemiology of BVDV in Colombia, and to formulate strategies in the region to mitigate the impact of this virus on the productive and reproductive indicators of cattle farms at the regional level.
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Affiliation(s)
- Diego Ortiz Ortega
- Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, Centro de Investigación Tibaitatá, Mosquera, Cundinamarca, Colombia
| | | | | | - Juan Felipe Rocha
- Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, Centro de Investigación Tibaitatá, Mosquera, Cundinamarca, Colombia
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10
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van Roon AM, Mercat M, van Schaik G, Nielen M, Graham DA, More SJ, Guelbenzu-Gonzalo M, Fourichon C, Madouasse A, Santman-Berends IMGA. Quantification of risk factors for bovine viral diarrhea virus in cattle herds: A systematic search and meta-analysis of observational studies. J Dairy Sci 2020; 103:9446-9463. [PMID: 32747110 DOI: 10.3168/jds.2020-18193] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 05/20/2020] [Indexed: 12/20/2022]
Abstract
Bovine viral diarrhea virus (BVDV) is endemic in many parts of the world, and multiple countries have implemented surveillance activities for disease control or eradication. In such control programs, the disease-free status can be compromised by factors that pose risks for introduction or persistence of the virus. The aim of the present study was to gain a comprehensive overview of possible risk factors for BVDV infection in cattle herds in Europe and to assess their importance. Papers that considered risk factors for BVDV infection in cattle were identified through a systematic search. Further selection of papers eligible for quantitative analysis was performed using a predefined checklist, including (1) appropriate region (i.e., studies performed in Europe), (2) representativeness of the study population, (3) quality of statistical analysis, and (4) availability of sufficient quantitative data. In total, 18 observational studies were selected. Data were analyzed by a random-effects meta-analysis to obtain pooled estimates of the odds of BVDV infection. Meta-analyses were performed on 6 risk factors: herd type, herd size, participation in shows or markets, introduction of cattle, grazing, and contact with other cattle herds on pasture. Significant higher odds were found for dairy herds (odds ratio, OR = 1.63, 95% confidence interval, CI: 1.06-2.50) compared with beef herds, for larger herds (OR = 1.04 for every 10 extra animals in the herd, 95% CI: 1.02-1.06), for herds that participate in shows or markets (OR = 1.45, 95% CI: 1.10-1.91), for herds that introduced cattle into the herd (OR = 1.41, 95% CI: 1.18-1.69), and for herds that share pasture or have direct contact with cattle of other herds at pasture (OR = 1.32, 95% CI: 1.07-1.63). These pooled values must be interpreted with care, as there was a high level of heterogeneity between studies. However, they do give an indication of the importance of the most frequently studied risk factors and can therefore assist in the development, evaluation, and optimization of BVDV control programs.
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Affiliation(s)
- A M van Roon
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3508, TD Utrecht, the Netherlands.
| | - M Mercat
- INRAE, Oniris, BIOEPAR, 44300, Nantes, France
| | - G van Schaik
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3508, TD Utrecht, the Netherlands; Royal GD, 7400 AA, Deventer, the Netherlands
| | - M Nielen
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3508, TD Utrecht, the Netherlands
| | - D A Graham
- Animal Health Ireland, Carrick on Shannon, Co. Leitrim N41 WN27, Ireland
| | - S J More
- Centre for Veterinary Epidemiology and Risk Analysis, UCD School of Veterinary Medicine, University College Dublin, Belfield, Dublin D04 W6F6, Ireland
| | | | - C Fourichon
- INRAE, Oniris, BIOEPAR, 44300, Nantes, France
| | - A Madouasse
- INRAE, Oniris, BIOEPAR, 44300, Nantes, France
| | - I M G A Santman-Berends
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3508, TD Utrecht, the Netherlands; Royal GD, 7400 AA, Deventer, the Netherlands
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Gaeta NC, Ribeiro BL, Alemán MA, Yoshihara E, Marques EC, Hellmeister AN, Pituco EM, Gregory L. Serological investigation of antibodies against respiratory viruses in calves from Brazilian family farming and their relation to clinical signs of bovine respiratory disease. PESQUISA VETERINARIA BRASILEIRA 2018. [DOI: 10.1590/1678-5150-pvb-5234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABSTRACT: Bovine respiratory disease (BRD) is responsible for economic losses in cattle production. Viruses are categorized as primary etiological agents. The aims of this study were to evaluate the presence of antibodies against bovine viral diarrhea virus (BVDV), bovine herpes virus type 1 (BoHV-1), and bovine respiratory syncytial virus (BRSV) in healthy and BRD calves from family farming in relation to clinical signs of BRD. Hundred and forty-five calves were randomly selected and physical examination was performed. Only 123 animals were classified as healthy and BRD calves. Antibodies were evaluated by virus neutralization test. Person’s Chi-square test and Fisher’s exact test were performed as univariate analysis. Binary Logistic Regression was applied as multivariate analysis. Variables with P<0.10 were considered statistically significant. Variables with 0.15<P<0.10 were considered as statistical tendencies. Antibodies against BoHV-1, BVDV, and BRSV were detected in 32%, 23% and 37% animals. Antibodies against both three viruses were detected in 26.8% of calves. The presence of antibodies against BRSV were associated to normal heart rates (P=0.018) and unilateral airflow (P=0.035). Tendency was observed to unilateral airflow (P=0.06) Statistical tendencies were observed to Ab-BoHV-1 and body temperature (P=0.119) and breathing pattern (P=0.123). The profile of antibodies against respiratory viruses in calves from Brazilian family farming was firstly described. The results confirmed the importance of some clinical signs to viral infection.
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Fernandes LG, Pituco EM, de Campos Nogueira Romaldini AH, De Stefano E, Clementino IJ, Maia ARA, de Sousa Américo Batista Santos C, Alves CJ, de Azevedo SS. Spatial analysis for bovine viral diarrhea virus and bovine herpesvirus type 1 infections in the state of Paraíba, northeastern Brazil. BMC Vet Res 2018; 14:102. [PMID: 29554912 PMCID: PMC5859533 DOI: 10.1186/s12917-018-1412-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 03/06/2018] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Bovine Viral Diarrhea Virus (BVDV) and Bovine Herpesvirus type 1 (BoHV-1) cause reproductive problems in cattle and restrictions on international trade in animals worldwide. Both infections were detected in cattle herds in the Paraíba state, Northeastern Brazil, however, the spatial distribution and geographic identification of positive herds for these viruses has never been examined. Therefore, the aim of this study was to describe the spatial pattern of apparent prevalence estimate and to identify spatial clustering of positive herds of BVDV and BoHV-1 infections in cattle herds from the state of Paraíba, Northeastern Brazil. RESULTS The herd-level prevalence for BVDV and BoHV-1 infections in Paraíba were, respectively, 65.5% (95% CI: 61.1-69.7) and 87.8% (95% CI: 84.5-90.5). The average apparent within-herd prevalence of BVDV was 31.8% and of BoHV-1 was 62.4%. The predicted prevalence was highest (0.42-0.75) for BVDV in the west, north and eastern part of Sertão and in the central and eastern part of Agreste/Zona da Mata. For BoHV-1, the highest predicted prevalence (0.74-0.97) was in some local areas across Sertão and throughout the eastern part of Agreste/Zona da Mata. Six significant clusters were detected for BVDV, a primary cluster covering the eastern Sertão region, with 11 herds, radius of 24.10 km and risk relative (RR) of 2.21 (P < 0.001) and five smaller significant clusters, involving one or two herds in Agreste/Zona da Mata region with a high RR. A significant clustering of BoHV-1 positive herds (P < 0.001) was detected in Agreste/Zona da Mata region with a radius of 77.17 km and a RR of 1.27, with 103 cases. Consistency was found between kriging and SatScan results for identification of risk areas for BVDV and BoHV-1 infections. CONCLUSIONS The clusters detected contemplated different areas of the state, with BVDV cluster located in the Sertão and BoHV-1 in Agreste/Zona da Mata stratum. Through the risk mapping, it was possible to identify the areas in which the risk is significantly elevated, coincided with areas where there are borders with other states and in which there is a high movement of animals.
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Affiliation(s)
- Leíse Gomes Fernandes
- Laboratory of Transmissible Diseases, Academic Unit of Veterinary Medicine, Center of Rural Technology and Health, Federal University of Campina Grande, Patos, PB 58700-970 Brazil
| | | | | | - Eliana De Stefano
- Laboratory of Bovidae Viruses, Biological Institute, São Paulo, SP 04014-900 Brazil
| | - Inácio José Clementino
- Department of Veterinary Medicine, Federal University of Paraíba, Areia, PB 58397-000 Brazil
| | - Amanda Rafaela Alves Maia
- Laboratory of Transmissible Diseases, Academic Unit of Veterinary Medicine, Center of Rural Technology and Health, Federal University of Campina Grande, Patos, PB 58700-970 Brazil
| | - Carolina de Sousa Américo Batista Santos
- Laboratory of Transmissible Diseases, Academic Unit of Veterinary Medicine, Center of Rural Technology and Health, Federal University of Campina Grande, Patos, PB 58700-970 Brazil
| | - Clebert José Alves
- Laboratory of Transmissible Diseases, Academic Unit of Veterinary Medicine, Center of Rural Technology and Health, Federal University of Campina Grande, Patos, PB 58700-970 Brazil
| | - Sérgio Santos de Azevedo
- Laboratory of Transmissible Diseases, Academic Unit of Veterinary Medicine, Center of Rural Technology and Health, Federal University of Campina Grande, Patos, PB 58700-970 Brazil
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Velasova M, Damaso A, Prakashbabu BC, Gibbons J, Wheelhouse N, Longbottom D, Van Winden S, Green M, Guitian J. Herd-level prevalence of selected endemic infectious diseases of dairy cows in Great Britain. J Dairy Sci 2017; 100:9215-9233. [PMID: 28843682 DOI: 10.3168/jds.2016-11863] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 05/14/2017] [Indexed: 02/03/2023]
Abstract
To implement appropriate and effective disease control programs at the national level, up-to-date and unbiased information on disease frequency is needed. The aim of this study was to estimate the prevalence of selected endemic infectious diseases in the population of dairy herds in Great Britain. Bulk milk tank (BMT) samples from 225 randomly selected dairy farms, stratified by region and herd size, were tested for antibodies against bovine viral diarrhea virus (BVDV), bovine herpesvirus type 1, Mycobacterium avium ssp. paratuberculosis, Leptospira Hardjo, Salmonella spp., Coxiella burnetii, Fasciola hepatica, Neospora caninum, and Ostertagia ostertagi. Furthermore, the presence of BVDV, C. burnetii, and Chlamydia-like organisms was determined by PCR. The apparent herd prevalence was estimated as a weighted proportion of positive herds. The true prevalence was calculated when a test was used with known test characteristics for the cut-off value used. Among unvaccinated herds, the true prevalence of BMT antibodies against BVDV was estimated at 66% [95% confidence interval (CI): 56-77%], M. avium ssp. paratuberculosis 68% (95% CI: 59-77%), bovine herpesvirus type 1 62% (95% CI: 52-73%), Leptospira Hardjo 47% (95% CI: 34-60%), and Salmonella spp. 48% (95% CI: 39-56%). The apparent prevalence of BMT antibodies against C. burnetii was 80% (95% CI: 75-85%), F. hepatica 55% (95% CI: 48-62%), N. caninum 46% (95% CI: 38-54%), and O. ostertagi 95% (95% CI: 91-98%). The BVDV, C. burnetii, and Chlamydia-like antigens were detected in 5 (95% CI: 2-9%), 29 (95% CI: 21-36%), and 31% (95% CI: 24-38%) of herds, respectively. Our results show that dairy cows across GB are frequently exposed to the studied pathogens, which are endemic at high levels with some geographical variations. These prevalence estimates provide a much-needed basis to assess whether nationwide control programs for the studied pathogens are justified by their potential economic, environmental, and public health implications. Should surveillance and control programs be initiated, the estimates presented here are a baseline against which progress can be assessed.
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Affiliation(s)
- Martina Velasova
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Science, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire, AL9 7TA United Kingdom.
| | - Angela Damaso
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Science, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire, AL9 7TA United Kingdom
| | - Bhagyalakshmi Chengat Prakashbabu
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Science, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire, AL9 7TA United Kingdom
| | - Jenny Gibbons
- AHDB Dairy, Agriculture and Horticulture Development Board, Stoneleigh Park, Kenilworth, Warwickshire, CV8 2TL United Kingdom
| | - Nick Wheelhouse
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian EH26 0PZ, United Kingdom
| | - David Longbottom
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian EH26 0PZ, United Kingdom
| | - Steven Van Winden
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Science, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire, AL9 7TA United Kingdom
| | - Martin Green
- The School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Leicestershire, LE12 5RD United Kingdom
| | - Javier Guitian
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Science, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire, AL9 7TA United Kingdom
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Maia AR, Fernandes LG, Pinto PS, Guimarães-Peixoto RP, Silva LF, Santos CS, Alves CJ, Clementino IJ, Azevedo SS. Herd-level seroprevalence and associated risk factors for bovine cysticercosis in the State of Paraíba, Northeastern Brazil. Prev Vet Med 2017; 142:51-57. [DOI: 10.1016/j.prevetmed.2017.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 05/05/2017] [Accepted: 05/08/2017] [Indexed: 11/24/2022]
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Segura-Correa J, Zapata-Campos C, Jasso-Obregón J, Martinez-Burnes J, López-Zavala R. Seroprevalence and risk factors associated with bovine herpesvirus 1 and bovine viral diarrhea virus in North-Eastern Mexico. Open Vet J 2016; 6:143-9. [PMID: 27622156 PMCID: PMC5011497 DOI: 10.4314/ovj.v6i2.12] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 08/12/2016] [Indexed: 11/29/2022] Open
Abstract
Bovine herpesvirus 1 (BoHV-1) and bovine viral diarrhea virus (BVDV) are well known etiological agents of cattle that produce important economic losses due to reproductive failures and calf mortality, as well as enteric and respiratory disease. Tamaulipas is located northeast of Mexico, an important cattle production and the principal exporter of calf and heifer to the United States. The objectives of this study were to estimate the seroprevalence of BoHV-1 and of BVDV, and to determine the effects of risk factors on these infections. Blood samples of cattle from 57 farms from rural districts of Tamaulipas were collected. The samples were tested for antibodies against BoHV-1 and BVDV using commercial ELISA kits. Data on potential risk factors were obtained using a questionnaire administered to the farmer at the time the blood samples were taken. The seroprevalences for BoHV-1 and BVDV were 64.4% and 47.8%, respectively. In the logistic regression analysis, the significant risk factors were rural district, herd size and cattle introduced to the farm. This study confirms the high seroprevalence of BoHV-1 and BVDV in unvaccinated cattle in Tamaulipas, Mexico. The results of this study could be used for the development of BoHV-1 and BVDV prevention and control program in North-Eastern, Mexico.
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Affiliation(s)
- J.C. Segura-Correa
- Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Km. 5 Carretera Mérida-Xmatkuil, Mérida, Yucatán, C.P. 97315, México
| | - C.C. Zapata-Campos
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 A.P. No. 263 C.P. 87000, Mexico
| | - J.O. Jasso-Obregón
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 A.P. No. 263 C.P. 87000, Mexico
| | - J. Martinez-Burnes
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 A.P. No. 263 C.P. 87000, Mexico
| | - R. López-Zavala
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 A.P. No. 263 C.P. 87000, Mexico
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Seroprevalence and risk factors of bovine viral diarrhoea virus (BVDV) infection in yaks (Bos grunniens) in northwest China. Trop Anim Health Prod 2016; 48:1747-1750. [DOI: 10.1007/s11250-016-1118-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 08/01/2016] [Indexed: 11/26/2022]
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