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Ruedas-Torres I, Thi to Nga B, Salguero FJ. Pathogenicity and virulence of African swine fever virus. Virulence 2024; 15:2375550. [PMID: 38973077 PMCID: PMC11232652 DOI: 10.1080/21505594.2024.2375550] [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: 02/08/2024] [Accepted: 06/28/2024] [Indexed: 07/09/2024] Open
Abstract
African swine fever (ASF) is a devastating disease with a high impact on the pork industry worldwide. ASF virus (ASFV) is a very complex pathogen, the sole member of the family Asfaviridae, which induces a state of immune suppression in the host through infection of myeloid cells and apoptosis of lymphocytes. Moreover, haemorrhages are the other main pathogenic effect of ASFV infection in pigs, related to the infection of endothelial cells, as well as the activation and structural changes of this cell population by proinflammatory cytokine upregulation within bystander monocytes and macrophages. There are still many gaps in the knowledge of the role of proteins produced by the ASFV, which is related to the difficulty in producing a safe and effective vaccine to combat the disease, although few candidates have been approved for use in Southeast Asia in the past couple of years.
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Affiliation(s)
- Ines Ruedas-Torres
- Vaccine Development and Evaluation Centre (VDEC), United Kingdom Health Security Agency, Salisbury, UK
| | - Bui Thi to Nga
- Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Francisco J. Salguero
- Vaccine Development and Evaluation Centre (VDEC), United Kingdom Health Security Agency, Salisbury, UK
- School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
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2
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Yao M, Cao H, Li W, Hu Z, Rong Z, Yin M, Tian L, Hu D, Li X, Qian P. African swine fever virus MGF505-6R attenuates type I interferon production by targeting STING for degradation. Front Immunol 2024; 15:1380220. [PMID: 38799458 PMCID: PMC11116646 DOI: 10.3389/fimmu.2024.1380220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 04/29/2024] [Indexed: 05/29/2024] Open
Abstract
African swine fever (ASF) is an acute hemorrhagic and devastating infectious disease affecting domestic pigs and wild boars. It is caused by the African swine fever virus (ASFV), which is characterized by genetic diversity and sophisticated immune evasion strategies. To facilitate infection, ASFV encodes multiple proteins to antagonize host innate immune responses, thereby contributing to viral virulence and pathogenicity. The molecular mechanisms employed by ASFV-encoded proteins to modulate host antiviral responses have not been comprehensively elucidated. In this study, it was observed that the ASFV MGF505-6R protein, a member of the multigene family 505 (MGF505), effectively suppressed the activation of the interferon-beta (IFN-β) promoter, leading to reduced mRNA levels of antiviral genes. Additional evidence has revealed that MGF505-6R antagonizes the cGAS-STING signaling pathway by interacting with the stimulator of interferon genes (STING) for degradation in the autophagy-lysosomal pathway. The domain mapping revealed that the N-terminal region (1-260aa) of MGF505-6R is the primary domain responsible for interacting with STING, while the CTT domain of STING is crucial for its interaction with MGF505-6R. Furthermore, MGF505-6R also inhibits the activation of STING by reducing the K63-linked polyubiquitination of STING, leading to the disruption of STING oligomerization and TANK binding kinase 1 (TBK1) recruitment, thereby impairing the phosphorylation and nuclear translocation of interferon regulatory factor 3 (IRF3). Collectively, our study elucidates a novel strategy developed by ASFV MGF505-6R to counteract host innate immune responses. This discovery may offer valuable insights for further exploration of ASFV immune evasion mechanisms and antiviral strategies.
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Affiliation(s)
- Manman Yao
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Hua Cao
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Wentao Li
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Zihui Hu
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Zhenxiang Rong
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Mengge Yin
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Linxing Tian
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Dayue Hu
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Xiangmin Li
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, China
| | - Ping Qian
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, China
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Hiremath J, Hemadri D, Nayakvadi S, Kumar C, Gowda CSS, Sharma D, Ramamoorthy R, Mamatha SS, Patil S, Ranjini RA, Jayamohanan TV, Swapna SA, Gulati BR. Epidemiological investigation of ASF outbreaks in Kerala (India): detection, source tracing and economic implications. Vet Res Commun 2024; 48:827-837. [PMID: 37955753 DOI: 10.1007/s11259-023-10254-3] [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: 09/04/2023] [Accepted: 11/02/2023] [Indexed: 11/14/2023]
Abstract
This study investigates suspected African swine fever (ASF) outbreaks in two villages of Kannur district in Kerala, India, with the aim of identifying the causative agent and its genotype, the source of infection, and estimating the economic losses due to the outbreaks. Clinically, the disease was acute with high mortality, while gross pathology was characterized by widespread haemorrhages in various organs, especially the spleen, which was dark, enlarged and had friable cut surfaces with diffuse haemorrhages. Notably, histopathological examination revealed multifocal, diffuse haemorrhages in the splenic parenchyma and lymphoid depletion accompanied by lymphoid cell necrosis. The clinico-pathological observations were suggestive of ASF, which was confirmed by PCR. The source of outbreak was identified as swill and it was a likely point source infection as revealed by epidemic curve analysis. The phylogenetic analysis of p72 gene identified the ASFV in the current outbreak as genotype-II and IGR II variant consistent with ASFVs detected in India thus far. However, the sequence analysis of the Central Variable Region (CVR) of the B602L gene showed that the ASFVs circulating in Kerala (South India) formed a separate clade along with those found in Mizoram (North East India), while ASFVs circulating in Arunachal Pradesh and Assam states of India grouped in to different clade. This study represents the first investigation of ASF outbreak in South India, establishing the genetic relatedness of the ASFV circulating in this region with that in other parts of the country. The study also underscores the utility of the CVR of the B602L gene in genetically characterizing highly similar Genotype II ASFVs to understand the spread of ASF within the country.
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Affiliation(s)
- Jagadish Hiremath
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Divakar Hemadri
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Shivasharanappa Nayakvadi
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Chethan Kumar
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | | | - Damini Sharma
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Rajendran Ramamoorthy
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Suresh Shankanahalli Mamatha
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | - Sharanagouda Patil
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India
| | | | | | - Susan Abraham Swapna
- Department of Animal Husbandry, State Institute for Animal Diseases, Palode, Kerala, India
| | - Baldev Raj Gulati
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Yelahanka, Bengaluru, Karnataka, India.
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Rajkhowa S, Sonowal J, Pegu SR, Sanger GS, Deb R, Das PJ, Doley J, Paul S, Gupta VK. Natural co-infection of pigs with African swine fever virus and porcine reproductive and respiratory syndrome virus in India. Braz J Microbiol 2024; 55:1017-1022. [PMID: 38041718 PMCID: PMC10920511 DOI: 10.1007/s42770-023-01203-y] [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: 05/13/2023] [Accepted: 11/28/2023] [Indexed: 12/03/2023] Open
Abstract
Porcine reproductive and respiratory syndrome (PRRS) and African swine fever (ASF) are economically important diseases of pigs throughout the world. During an outbreak, all age groups of animals except piglets < 1 month of age were affected with symptoms of high fever, cutaneous hemorrhages, vomition with blood, diarrhea, poor appetite, ataxia, and death. The outbreak was confirmed by the detection of the N gene of the porcine reproductive and respiratory syndrome virus (PRRSV) and the VP72 gene of the African swine fever virus (ASFV) by PCR in representative blood samples from affected pigs followed by Sanger sequencing. Mixed infection was also confirmed by simultaneous detection of both the viruses using multiplex PCR. Phylogenetic analysis of both the viruses revealed that the outbreak was related to ASFV and PRRSV strains from China which were also closely related to the PRRSV and ASFV strains from the recent outbreak from India. The study confirmed the involvement of genotype II of ASFV and genotype 2 of PRRSV in the present outbreak. Interestingly, PRRSV associated with the present outbreak was characterized as a highly pathogenic PRRSV. Therefore, the present study indicates the possibility of future waves or further outbreaks of these diseases (PRRS and ASF) in this region. This is the first report of ASFV and PRRSV co-infection in pigs from India.
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Affiliation(s)
- Swaraj Rajkhowa
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India.
| | - Joyshikh Sonowal
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | - Seema Rani Pegu
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | | | - Rajib Deb
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | - Pranab Jyoti Das
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | - Juwar Doley
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | - Souvik Paul
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
| | - Vivek Kumar Gupta
- ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India
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Hang Vu TT, Le VP, Jeong DG, Yeom M, Oh J, Kang B, Park SK, Song D. Establishment of a p30-based lateral flow assay for African swine fever virus detection. J Virol Methods 2023; 322:114823. [PMID: 37748737 DOI: 10.1016/j.jviromet.2023.114823] [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: 08/22/2023] [Revised: 09/19/2023] [Accepted: 09/22/2023] [Indexed: 09/27/2023]
Abstract
African swine fever virus (ASFV) has continuously devastated the global pig industry. Viral persistence causes problems in large pig farms and kills small farms. Timely diagnostic tools play an important role in controlling outbreaks and minimizing losses. In this study, we developed a lateral flow assay to detect ASFV on-site. The VDRG® ASFV Ag Rapid Kit was established using two monoclonal antibodies (mAbs) against the p30 protein. The conjunction pad of the kit was coated with a mixture of the mAb and colloidal gold. This rapid kit was capable of detecting 11.5 ng of antigen and 0.16 HAD50 of virus from samples, in 20 min for the entire procedure. It passed cross-specific tests using common viruses that cause infectious diseases in pigs. ASFV was detected after 4 days in experimental infection in pigs by the kit. The specificity and sensitivity of the kit for clinical samples were 99.88% and 84.52% (93.8% for samples with a Ct value below 30), respectively. Finally, the kit can detect 100% positive herd outbreaks. The VDRG® ASFV Ag Rapid Kit presents a useful point-of-care tool for ASFV detection.
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Affiliation(s)
- Thi Thu Hang Vu
- College of Pharmacy, Korea University, Sejong, Republic of Korea
| | - Van Phan Le
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 131001, Viet Nam
| | - Dae Gwin Jeong
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea; Bio-Analytical Science Division, University of Science and Technology, Daejeon, Republic of Korea
| | - Minjoo Yeom
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Republic of Korea
| | - Jinsik Oh
- Median Diagnostics, Chuncheon, Gangwon-do 24399, Republic of Korea
| | - BoKyu Kang
- Median Diagnostics, Chuncheon, Gangwon-do 24399, Republic of Korea
| | - Song-Kyu Park
- College of Pharmacy, Korea University, Sejong, Republic of Korea.
| | - Daesub Song
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Republic of Korea.
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Jung MC, Le VP, Yoon SW, Le TN, Trinh TBN, Kim HK, Kang JA, Lim JW, Yeom M, Na W, Nah JJ, Choi JD, Kang HE, Song D, Jeong DG. A Robust Quadruple Protein-Based Indirect ELISA for Detection of Antibodies to African Swine Fever Virus in Pigs. Microorganisms 2023; 11:2758. [PMID: 38004769 PMCID: PMC10672928 DOI: 10.3390/microorganisms11112758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 11/02/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
African swine fever (ASF) emerged in domestic pigs and wild boars in China in 2018 and rapidly spread to neighboring Asian countries. Currently, no effective vaccine or diagnostic tests are available to prevent its spread. We developed a robust quadruple recombinant-protein-based indirect enzyme-linked immunosorbent assay (QrP-iELISA) using four antigenic proteins (CD2v, CAP80, p54, and p22) to detect ASF virus (ASFV) antibodies and compared it with a commercial kit (IDvet) using ASFV-positive and -negative serum samples. The maximum positive/negative value was 24.033 at a single antigen concentration of 0.25 μg/mL and quadruple ASFV antigen combination of 1 μg/mL at a 1:100 serum dilution. Among 70 ASFV-positive samples, 65, 67, 65, 70, 70, and 14 were positive above the cut-offs of 0.121, 0.121, 0.183, 0.065, 0.201, and 0.122, for CD2v, CAP80, p54, p22-iELISA, QrP-iELISA, and IDvet, respectively, with sensitivities of 92.9%, 95.7%, 92.9%, 100%, 100%, and 20%, respectively, all with 100% specificity. The antibody responses in QrP-iELISA and IDvet were similar in pigs infected with ASFV I. QrP-iELISA was more sensitive than IDvet for early antibody detection in pigs infected with ASFV II. These data provide a foundation for developing advanced ASF antibody detection kits critical for ASF surveillance and control.
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Affiliation(s)
- Min-Chul Jung
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (M.-C.J.); (T.N.L.); (J.-A.K.)
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea
| | - Van Phan Le
- Department of Microbiology and Infectious Diseases, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 100000, Vietnam; (V.P.L.); (T.B.N.T.)
| | - Sun-Woo Yoon
- Department of Biological Science and Biotechnology, Andong National University, Andong 36729, Republic of Korea;
| | - Thi Ngoc Le
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (M.-C.J.); (T.N.L.); (J.-A.K.)
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea
| | - Thi Bich Ngoc Trinh
- Department of Microbiology and Infectious Diseases, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 100000, Vietnam; (V.P.L.); (T.B.N.T.)
| | - Hye Kwon Kim
- Department of Microbiology, College of Natural Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea;
| | - Jung-Ah Kang
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (M.-C.J.); (T.N.L.); (J.-A.K.)
| | - Jong-Woo Lim
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Minjoo Yeom
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Woonsung Na
- College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Republic of Korea;
| | - Jin-Ju Nah
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (J.-J.N.); (J.-D.C.); (H.-E.K.)
| | - Ji-Da Choi
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (J.-J.N.); (J.-D.C.); (H.-E.K.)
| | - Hae-Eun Kang
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (J.-J.N.); (J.-D.C.); (H.-E.K.)
| | - Daesub Song
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Dae Gwin Jeong
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (M.-C.J.); (T.N.L.); (J.-A.K.)
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea
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Ito S, Kawaguchi N, Bosch J, Aguilar-Vega C, Sánchez-Vizcaíno JM. What can we learn from the five-year African swine fever epidemic in Asia? Front Vet Sci 2023; 10:1273417. [PMID: 37841468 PMCID: PMC10569053 DOI: 10.3389/fvets.2023.1273417] [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: 08/06/2023] [Accepted: 09/11/2023] [Indexed: 10/17/2023] Open
Abstract
Today's global swine industry is exposed to the unprecedented threat of African swine fever (ASF). Asia, the site of the most recent epidemics, could serve as a huge viral reservoir for the rest of the world given the severity of the damage, the huge swine industry, and the high volume of trade with other countries around the world. As the majority of ASF notifications in Asia today originate from pig farms, the movement of live pigs and associated pork products are considered critical control points for disease management. Particularly, small-scale or backyard farms with low biosecurity levels are considered major risk factors. Meanwhile, wild boars account for most notified cases in some countries and regions, which makes the epidemiological scenario different from that in other Asian countries. As such, the current epidemic situation and higher risk factors differ widely between these countries. A variety of studies on ASF control have been conducted and many valuable insights have been obtained in Asia; nevertheless, the overall picture of the epidemic is still unclear. The purpose of this review is to provide an accurate picture of the epidemic situation across Asia, focusing on each subregion to comprehensively explain the disease outbreak. The knowledge gained from the ASF epidemics experienced in Asia over the past 5 years would be useful for disease control in areas that are already infected, such as Europe, as well as for non-affected areas to address preventive measures. To this end, the review includes two aspects: a descriptive analytical review based on publicly available databases showing overall epidemic trends, and an individualized review at the subregional level based on the available literature.
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Affiliation(s)
- Satoshi Ito
- VISAVET Health Surveillance Center, Complutense University of Madrid, Madrid, Spain
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - Nijiho Kawaguchi
- VISAVET Health Surveillance Center, Complutense University of Madrid, Madrid, Spain
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
- Division of Molecular Pathobiology, Hokkaido University International Institute for Zoonosis Control, Sapporo, Japan
| | - Jaime Bosch
- VISAVET Health Surveillance Center, Complutense University of Madrid, Madrid, Spain
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - Cecilia Aguilar-Vega
- VISAVET Health Surveillance Center, Complutense University of Madrid, Madrid, Spain
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - Jose Manuel Sánchez-Vizcaíno
- VISAVET Health Surveillance Center, Complutense University of Madrid, Madrid, Spain
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
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Le VP, Ahn MJ, Kim JS, Jung MC, Yoon SW, Trinh TBN, Le TN, Kim HK, Kang JA, Lim JW, Yeom M, Na W, Xie X, Feng Z, Song D, Jeong DG. A Whole-Genome Analysis of the African Swine Fever Virus That Circulated during the First Outbreak in Vietnam in 2019 and Subsequently in 2022. Viruses 2023; 15:1945. [PMID: 37766351 PMCID: PMC10537361 DOI: 10.3390/v15091945] [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: 09/07/2023] [Revised: 09/12/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023] Open
Abstract
Since its initial report in Vietnam in early 2019, the African swine fever (ASF), a highly lethal and severe viral swine disease worldwide, continues to cause outbreaks in other Southeast Asian countries. This study analyzed and compared the genomic sequences of ASF viruses (ASFVs) during the first outbreak in Hung Yen (VN/HY/2019-ASFV1) and Quynh Phu provinces (VN/QP/2019-ASFV1) in Vietnam in 2019, and the subsequent outbreak in Hung Yen (VN/HY/2022-ASFV2) in 2022, to those of other ASFV strains. VN/HY/2019-ASFV1, VN/QP/2019-ASFV1, and VN/HY/2022-ASFV2 genomes were 189,113, 189,081, and 189,607 bp in length, encoding 196, 196, and 203 open reading frames (ORFs), respectively. VN/HY/2019-ASFV1 and VN/QP/2019-ASFV1 shared a 99.91-99.99% average nucleotide identity with genotype II strains. Variations were identified in 28 ORFs in VN/HY/2019-ASFV1 and VN/QP/2019-ASFV1 compared to 20 ASFV strains, and 16 ORFs in VN/HY/2022-ASFV2 compared to VN/HY/2019-ASFV1 and VN/QP/2019-ASFV1. Vietnamese ASFV genomes were classified as IGR II variants between the I73R and I329L genes, with two copy tandem repeats between the A179L and A137R genes. A phylogenetic analysis based on the whole genomes of 27 ASFV strains indicated that the Vietnamese ASFV strains are genetically related to Estonia 2014, ASFV-SY18, and Russia/Odintsovo_02/14. These results reveal the complete genome sequences of ASFV circulating during the first outbreak in 2019, providing important insights into understanding the evolution, transmission, and genetic variation of ASFV in Vietnam.
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Affiliation(s)
- Van Phan Le
- Department of Microbiology and Infectious Diseases, College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 100000, Vietnam; (V.P.L.); (T.B.N.T.)
| | - Min-Ju Ahn
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea; (M.-J.A.); (M.-C.J.)
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (T.N.L.); (J.-A.K.)
| | - Jun-Seob Kim
- Department of Nano-Bioengineering, Incheon National University, Incheon 22012, Republic of Korea;
| | - Min-Chul Jung
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea; (M.-J.A.); (M.-C.J.)
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (T.N.L.); (J.-A.K.)
| | - Sun-Woo Yoon
- Department of Biological Science and Biotechnology, Andong National University, Andong 36729, Republic of Korea;
| | - Thi Bich Ngoc Trinh
- Department of Microbiology and Infectious Diseases, College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 100000, Vietnam; (V.P.L.); (T.B.N.T.)
| | - Thi Ngoc Le
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea; (M.-J.A.); (M.-C.J.)
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (T.N.L.); (J.-A.K.)
| | - Hye Kwon Kim
- Department of Microbiology, College of Natural Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea;
| | - Jung-Ah Kang
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (T.N.L.); (J.-A.K.)
| | - Jong-Woo Lim
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Minjoo Yeom
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Woonsung Na
- College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Republic of Korea;
| | - Xing Xie
- Key Laboratory for Veterinary Bio-Product Engineering, Ministry of Agriculture and Rural Affairs, Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (X.X.); (Z.F.)
| | - Zhixin Feng
- Key Laboratory for Veterinary Bio-Product Engineering, Ministry of Agriculture and Rural Affairs, Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (X.X.); (Z.F.)
| | - Daesub Song
- College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; (J.-W.L.); (M.Y.)
| | - Dae Gwin Jeong
- Department of Proteome Structural Biology, KRIBB School of Bioscience, University of Science and Technology, Daejeon 34141, Republic of Korea; (M.-J.A.); (M.-C.J.)
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; (T.N.L.); (J.-A.K.)
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9
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Wang J, Bai J, Zhang L, Xia T, Yang X, Zhang K, Gao Y, Jiang P. A new B cell epitope of pC129R protein of African swine fever virus identified by monoclonal antibodies. Vet Microbiol 2023; 282:109744. [PMID: 37094439 DOI: 10.1016/j.vetmic.2023.109744] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/07/2023] [Accepted: 04/10/2023] [Indexed: 04/26/2023]
Abstract
African swine fever virus (ASFV) is a most important pathogen which causes huge damage in swine production in the world. pC129R protein is one of the most abundant ASFV proteins in infected Vero cells and WSL-HP cells, which consequently could be a target for ASF detection and surveillance. In this study, 5-6-week-old female BALB/c mice were immunized with rpC129R protein expressed by a prokaryotic system. And three hybridomas, 1B1, 1B4 and 4H4, steadily secreted anti-pC129R monoclonal antibodies were screened by an indirect enzyme linked immunosorbent assay (ELISA). Among them, 1B4 and 4H4 had IgG2a isotype with Kappa light chain, while 1B1 had IgG1 isotype with Kappa light chain. Western blot and indirect immunofluorescence assay showed that three monoclonal antibodies (mAbs) specifically reacted with ASFV. Epitope mapping was performed with truncated polypeptides. And a new B cell epitope, 18KHYVLIPK25 was identified by the mAbs, which was highly conserved in most genotypes of ASFV. These findings not only provide a monoclonal antibody tool for further study of the function of C129R, but also lay the foundation for serological diagnosis and vaccine development.
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Affiliation(s)
- Junrong Wang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Juan Bai
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Lujie Zhang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Tingting Xia
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xing Yang
- State Key Laboratory of Veterinary Etiological Biology, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou University, Lanzhou 730046, China
| | - Keshan Zhang
- State Key Laboratory of Veterinary Etiological Biology, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou University, Lanzhou 730046, China
| | - Yanni Gao
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China.
| | - Ping Jiang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China.
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10
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Pathological Characteristics of Domestic Pigs Orally Infected with the Virus Strain Causing the First Reported African Swine Fever Outbreaks in Vietnam. Pathogens 2023; 12:pathogens12030393. [PMID: 36986314 PMCID: PMC10058432 DOI: 10.3390/pathogens12030393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/14/2023] [Accepted: 02/24/2023] [Indexed: 03/06/2023] Open
Abstract
African swine fever (ASF) is currently Vietnam’s most economically significant swine disease. The first ASF outbreak in Vietnam was reported in February 2019. In this study, VNUA/HY/ASF1 strain isolated from the first ASF outbreak was used to infect 10 eight-week-old pigs orally with 103 HAD50 per animal. The pigs were observed daily for clinical signs, and whole blood samples were collected from each animal for viremia detection. Dead pigs were subjected to full post-mortem analyses. All 10 pigs displayed acute or subacute clinical signs and succumbed to the infection between 10 to 27 (19.8 ± 4.66) days post-inoculation (dpi). The onset of clinical signs started around 4–14 dpi. Viremia was observed in pigs from 6–16 dpi (11.2 ± 3.55). Enlarged, hyperemic, and hemorrhagic lymph nodes, enlarged spleen, pneumonia, and hydropericardium were observed at post-mortem examinations.
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11
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Buragohain L, Barman NN, Sen S, Bharali A, Dutta B, Choudhury B, Suresh KP, Gaurav S, Kumar R, Ali S, Kumar S, Singh Malik Y. Transmission of African Swine Fever Virus to the Wild Boars of Northeast India. Vet Q 2023; 43:1-10. [PMID: 36786106 PMCID: PMC10124978 DOI: 10.1080/01652176.2023.2178689] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
BACKGROUND India recorded the first outbreak of African swine fever (ASF) in North-eastern region (NER) in the year 2020. AIM The current study was undertaken to investigate the transmission of African swine fever virus (ASFV) in the wild boars of Northeast India, particularly of Assam. MATERIAL AND METHODS ASF suspected mortal tissue remains and blood samples of wild boars collected from different locations of Assam were screened for molecular detection of swine viruses which includes Classical swine fever virus, Porcine Circovirus 2, Porcine reproductive and respiratory syndrome virus and ASFV. RESULTS One sample each from Manas and Nameri National Parks were detected positive for ASFV. Besides this, one of the samples was positive for CSFV and one of the ASFV positive samples was also positive for PCV2. Several striking gross and microscopic alterations were noticed in different organs of ASFV infected animals. Sequencing and phylogenetic analysis of B646L gene confirmed the presence of ASFV genotype-II in wild boars. Circulation of similar genotype in domestic pigs of NER in the contemporary period as well as locations near to the aforementioned national parks indicates the transmission of ASFV from domestic to wild boars. CLINICAL RELEVANCE The detection of ASFV in the wild boars of Assam is alarming as it is an impending threat to pig population and other endangered species (particularly Pygmy hog), making it increasingly daunting to control the disease. CONCLUSION Chances are high for ASFV to become endemic in Assam region if stringent measures are not taken at proper time.
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Affiliation(s)
- Lukumoni Buragohain
- College of Veterinary Science, Assam Agricultural University, Guwahati, Assam, India
| | - Nagendra Nath Barman
- College of Veterinary Science, Assam Agricultural University, Guwahati, Assam, India
| | - Suparna Sen
- College of Veterinary Science, Assam Agricultural University, Guwahati, Assam, India
| | - Arpita Bharali
- College of Veterinary Science, Assam Agricultural University, Guwahati, Assam, India
| | - Biswajit Dutta
- College of Veterinary Science, Assam Agricultural University, Guwahati, Assam, India
| | | | | | | | - Rakesh Kumar
- Indian Institute of Technology, Guwahati, Assam, India
| | - Samsul Ali
- Wildlife Trust of India, CWRC, Kaziranga, Assam, India
| | - Sachin Kumar
- Indian Institute of Technology, Guwahati, Assam, India
| | - Yashpal Singh Malik
- College of Animal Biotechnology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
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12
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Hien ND, Nguyen LT, Isoda N, Sakoda Y, Hoang LT, Stevenson MA. Descriptive epidemiology and spatial analysis of African swine fever epidemics in Can Tho, Vietnam, 2019. Prev Vet Med 2023; 211:105819. [PMID: 36571907 DOI: 10.1016/j.prevetmed.2022.105819] [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: 03/15/2022] [Revised: 11/03/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
The objectives of this study were to describe the epidemiology of African swine fever (ASF) and to identify factors that increased commune-level risk for ASF in Can Tho, a province in the Mekong River Delta of Vietnam. In 2019, a total of 2377 of the 5220 pig farms in Can Tho were ASF positive, an incidence risk of 46 (95% CI 44-47) ASF positive farms for every 100 farms at risk. Throughout the outbreak ASF resulted in either the death or culling of 59,529 pigs out of a total population size of 124,516 (just under half of the total pig population, 48%). After the first detection in Can Tho in May 2019, ASF spread quickly across all districts with an estimated dissemination ratio (EDR) of greater than one up until the end of July 2019. A mixed-effects Poisson regression model was developed to identify risk factors for ASF. One hundred unit increases in the number of pigs per square kilometre was associated with a 1.28 (95% CrI 1.05-1.55) fold increase in commune-level ASF incidence rate. One unit increases in the number of pig farms per square kilometre was associated with a 0.91 (95% CrI 0.84-0.99) decrease in commune-level ASF incidence rate. Mapping spatially contiguous communes with elevated (unaccounted-for) ASF risk provide a means for generating hypotheses for continued disease transmission. We propose that the analyses described in this paper might be run on an ongoing basis during an outbreak and disease control efforts modified in light of the information provided.
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Affiliation(s)
- Nguyen Duc Hien
- Faculty of Veterinary Medicine, College of Agriculture, Can Tho University, Campus II, 3/2 street, Ninh Kieu district, Can Tho, Viet Nam; Can Tho Sub-Department of Animal Health, Ministry of Agriculture and Rural Development, 30/4 street, Ninh Kieu district, Can Tho, Viet Nam.
| | - Lam Thanh Nguyen
- Faculty of Veterinary Medicine, College of Agriculture, Can Tho University, Campus II, 3/2 street, Ninh Kieu district, Can Tho, Viet Nam.
| | - Norikazu Isoda
- Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, North 18, West 9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan.
| | - Yoshihiro Sakoda
- Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, North 18, West 9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan.
| | - Le Trung Hoang
- Faculty of Veterinary Medicine, College of Agriculture, Can Tho University, Campus II, 3/2 street, Ninh Kieu district, Can Tho, Viet Nam; Can Tho Sub-Department of Animal Health, Ministry of Agriculture and Rural Development, 30/4 street, Ninh Kieu district, Can Tho, Viet Nam.
| | - Mark A Stevenson
- Asia-Pacific Centre for Animal Health, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia.
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13
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Yin D, Geng R, Shao H, Ye J, Qian K, Chen H, Qin A. Identification of novel linear epitopes in P72 protein of African swine fever virus recognized by monoclonal antibodies. Front Microbiol 2022; 13:1055820. [PMID: 36406452 PMCID: PMC9666363 DOI: 10.3389/fmicb.2022.1055820] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 10/17/2022] [Indexed: 01/13/2024] Open
Abstract
African swine fever (ASF) is one of the highly contagious and lethal diseases among domestic pigs and wild boars. The capsid protein P72 of African swine fever virus (ASFV) is very important for the diagnosis and vaccine development. However, the epitope of the protein is not clear. In this study, capsid protein P72 was expressed in Sf9 cells along with its chaperone B602L. A total of ten monoclonal antibodies (mAbs) specific to P72 protein were developed by fusions between SP2/0 cells and spleen cells of mice immunized with the recombinant-P72&B602L proteins expressed in Sf9 cells. Four linear B cell epitopes 31SNIKNVNKSY40, 41GKPDP45, 56HLVHFNAH63 and 185ERLYE189 were identified. Biological information analysis illustrated that epitopes 31SNIKNVNKSY40, 41GKPDP45 and 185ERLYE189 were highly conserved within different ASFV strains. These findings may lead to a better understanding of the antibody-antigen interaction and provide new insights into the vaccine research and serological diagnosis of ASF.
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Affiliation(s)
- Dan Yin
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
| | - Renhao Geng
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
| | - Hongxia Shao
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
| | - Jianqiang Ye
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
| | - Kun Qian
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
| | - Hongjun Chen
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, China
| | - Aijian Qin
- The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, China
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14
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Kwon HI, Do DT, Van Vo H, Lee SC, Kim MH, Nguyen DTT, Tran TM, Le QTV, Ngo TTN, Nguyen NM, Lee JY, Nguyen TT. Development of optimized protocol for culturing African swine fever virus field isolates in MA104 cells. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2022; 86:261-268. [PMID: 36211218 PMCID: PMC9536354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 03/23/2022] [Indexed: 04/03/2023]
Abstract
The goal of this study was to identify a candidate commercial cell line for the replication of African swine fever virus (ASFV) by comparing several available cell lines with various medium factors. In the sensitivity test of cells, MA104 and MARC-145 had strong potential for ASFV replication. Next, MA104 cells were used to compare the adaptation of ASFV obtained from tissue homogenates and blood samples in various infectious media. At the 10th passage, the ASFV obtained from the blood sample had a significantly higher viral load than that obtained from the tissue sample (P = 0.000), exhibiting a mean cycle threshold (Ct) value = 20.39 ± 1.99 compared with 25.36 ± 2.11. For blood samples, ASFV grew on infectious medium B more robustly than on infectious medium A (P = 0.006), corresponding to a Ct value = 19.58 ± 2.10 versus 21.20 ± 1.47. African swine fever virus originating from blood specimens continued to multiply gradually and peaked in the 15th passage, exhibiting a Ct value = 14.36 ± 0.22 in infectious medium B and a Ct value = 15.42 ± 0.14 in infectious medium A. When ASFV was cultured from tissue homogenates, however, there was no difference (P = 0.062) in ASFV growth between infectious media A and B. A model was developed to enhance ASFV replication through adaptation to MA104 cells. The lack of mutation at the genetic segments encoding p72, p54, p30, and the central hypervariable region (CVR) in serial culture passages is important in increasing the probability of maintaining immunogenicity when developing a vaccine candidate.
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Affiliation(s)
- Hyeok-Il Kwon
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Duy Tien Do
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Hung Van Vo
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Seung-Chul Lee
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Min Ho Kim
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Dung Thi Thuy Nguyen
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Tan Minh Tran
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Quang Tin Vinh Le
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Tram Thi Ngoc Ngo
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Nam Minh Nguyen
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Joo Young Lee
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
| | - Toan Tat Nguyen
- ChoongAng Vaccine Laboratories, Daejeon, 34055, Republic of Korea (Hyeok-il Kwon, Seung-Chul Lee, Min Ho Kim, Joo Young Lee); Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Vietnam (Duy Tien Do, Dung Thi Thuy Nguyen, Tram Thi Ngoc Ngo, Toan Tat Nguyen); Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Department of Animal Health, Vietnam (Hung Van Vo, Tan Minh Tran, Quang Tin Vinh Le); Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, National University HCMC, Vietnam, (Nam Minh Nguyen)
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15
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Oh SI, Nguyen TTH, Yang MS, Nga BTT, Bui VN, Le VP, Yi SW, Kim E, Hur TY, Lee HS, Kim B. Blood parameters and pathological lesions in pigs experimentally infected with Vietnam's first isolated African swine fever virus. Front Vet Sci 2022; 9:978398. [PMID: 36157181 PMCID: PMC9495444 DOI: 10.3389/fvets.2022.978398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 08/01/2022] [Indexed: 11/28/2022] Open
Abstract
African swine fever virus (ASFV) is a notable virus and one of the most serious global threats to the pig industry. Improving awareness about host–virus interactions could facilitate the understanding of the disease pathogenesis. Therefore, we investigated changes in blood parameters, viral loads, and pathological changes in ASFV-inoculated pigs according to the time of death after the onset of viremia. For the analyses, the ASFV-infected pigs (n = 10) were divided into two groups (five pigs/group) according to their time of death after the onset of viremia. The blood cell count dynamics and serum biochemistry profiles were similar between the groups; however, viral load distribution was different. A comparison of the histopathological changes and immunohistochemistry results between the two groups indicated that the lymphoid system, particularly the spleen, was more damaged in the early stage of the disease than in the last stage. Additionally, the virus-induced lesions in other organs (liver and kidney) were more severe in the late stage than in the early stage. Our findings provide invaluable information on the characteristics of blood parameters and pathological lesions in pigs infected with the Asia-epidemic ASFV strain and the course of ASF, targeting internal organs in pigs. Overall, this study characterizes the host-pathogen interaction in ASFV infection, offering insight for the establishment of ASF control strategies.
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Affiliation(s)
- Sang-Ik Oh
- National Institute of Animal Science, Rural Development Administration, Wanju, South Korea
- College of Veterinary Medicine, Jeonbuk National University, Iksan, South Korea
- Sang-Ik Oh
| | - Thi Thu Huyen Nguyen
- Bac Giang Agriculture and Forestry University, Hanoi, Vietnam
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Myeon-Sik Yang
- College of Veterinary Medicine, Jeonbuk National University, Iksan, South Korea
| | - Bui Thi To Nga
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Vuong Nghia Bui
- Virology Department, National Institute of Veterinary Research, Hanoi, Vietnam
| | - Van Phan Le
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Seung-Won Yi
- National Institute of Animal Science, Rural Development Administration, Wanju, South Korea
| | - Eunju Kim
- National Institute of Animal Science, Rural Development Administration, Wanju, South Korea
| | - Tai-Young Hur
- National Institute of Animal Science, Rural Development Administration, Wanju, South Korea
| | - Hu Suk Lee
- International Livestock Research Institute, Hanoi, Vietnam
- College of Veterinary Medicine, Chungnam National University, Daejeon, South Korea
- Hu Suk Lee
| | - Bumseok Kim
- College of Veterinary Medicine, Jeonbuk National University, Iksan, South Korea
- *Correspondence: Bumseok Kim
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16
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Temporal and Spatial Evolution of the African Swine Fever Epidemic in Vietnam. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19138001. [PMID: 35805660 PMCID: PMC9265385 DOI: 10.3390/ijerph19138001] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/21/2022] [Accepted: 06/28/2022] [Indexed: 11/17/2022]
Abstract
African swine fever (ASF) is a severe infectious disease affecting domestic and wild suids. Spatiotemporal dynamics analysis of the ASF is crucial to understanding its transmission. The ASF broke out in Vietnam in February 2019. The research on the spatiotemporal evolution characteristics of ASF in Vietnam is lacking. Spatiotemporal statistical methods, including direction analysis, spatial autocorrelation analysis, and spatiotemporal scan statistics were used to reveal the dynamics of the spatial diffusion direction and spatiotemporal aggregation characteristics of ASF in Vietnam. According to the cessation of the epidemic, it was divided into three phases: February to August 2019 (phase 1), April to December 2020 (phase 2), and January 2021 to March 2022 (phase 3). The ASF showed a significant spread trend from north to south in phase 1. The occurrence rate of the ASF aggregated spatially in phase 1 and became random in phases 2 and 3. The high−high ASF clusters (the province was a high cluster and both it and its neighbors had a high ASF occurrence rate) were concentrated in the north in phases 1 and 2. Four spatiotemporal high-risk ASF clusters were identified with a mean radius of 121.88 km. In general, there were significant concentrated outbreak areas and directional spread in the early stage and small-scale, high-frequency, and randomly scattered outbreaks in the later stage. The findings could contribute to a deeper understanding of the spatiotemporal spread of the ASF in Vietnam.
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17
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Nguyen HN, Nguyen QT, Nguyen BTP, Tran THA, Do DT, Hoang HT. Detection of African swine fever virus in neonatal piglets with congenital tremors. Arch Virol 2022; 167:1131-1135. [PMID: 35174413 DOI: 10.1007/s00705-022-05378-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 12/20/2021] [Indexed: 11/28/2022]
Abstract
African swine fever virus (ASF) has circulated in Vietnam since 2018, causing significant losses to the pig industry. Quick, accurate diagnosis of African swine fever virus (ASFV) infection is crucial for controlling the disease. The detection of the virus in piglets with congenital tremors is described in this paper. ASFV was detected in brain tissues by polymerase chain reaction (PCR) and immunohistochemistry. Classical swine fever virus, porcine parvovirus, porcine reproductive and respiratory syndrome virus, and pseudorabies virus were not detected by PCR, suggesting that the ASFV was the cause of these neurological signs.
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Affiliation(s)
- Hai Ngoc Nguyen
- Department of Infectious Disease and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam. .,HanViet Veterinary Diagnostic Lab, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam.
| | - Quan T Nguyen
- HanViet Veterinary Diagnostic Lab, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam
| | - Binh T P Nguyen
- HanViet Veterinary Diagnostic Lab, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam
| | - Thu H A Tran
- HanViet Veterinary Diagnostic Lab, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam
| | - Duy T Do
- Department of Infectious Disease and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam
| | - Hai Thanh Hoang
- Department of Infectious Disease and Veterinary Public Health, Faculty of Animal Science and Veterinary Medicine, Nonglam University, Thu Duc district, Hochiminh City, Vietnam.
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18
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Luong HQ, Lai HT, Do LD, Ha BX, Nguyen GV, Vu HL. Differential antibody responses in sows and finishing pigs naturally infected with African swine fever virus under field conditions. Virus Res 2022; 307:198621. [PMID: 34799123 DOI: 10.1016/j.virusres.2021.198621] [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: 09/23/2021] [Revised: 11/02/2021] [Accepted: 11/04/2021] [Indexed: 11/17/2022]
Abstract
Antibody profile of pigs naturally infected with a virulent African swine fever virus (ASFV) strain under field conditions was studied. Twenty-three serum samples were collected from pigs surviving a natural ASFV infection: 17 samples from finishing pigs (∼7 months old) and 6 samples from sows (between 12 and 36 months old). Additionally, 24 serum samples were collected from ASFV-naïve pigs to serve as negative controls. All sera from ASFV-surviving pigs tested positive while all sera from control pigs tested negative by two different commercial ELISA kits. Antibody reactivity of each serum sample was simultaneously measured against six selected ASFV antigens including p12, p32, p54, pp62, C-type lectin and CD2v. All ASFV-surviving pigs had antibody against p32, p54 and pp62 while 91.3% surviving pigs had antibody against p12. Only small portions of ASFV-surviving pigs exhibited antibodies against C-type lectin (34.8%) and CD2v (26.1%). While antibodies against p12, p32, p54 and pp62 were similarly detected in both finishing pigs and sows, antibodies against C-type lectin and CD2v were mainly detected in sows but not in finishing pigs. These results suggest a differential humoral immune response to ASFV infection in sows and finishing pigs. Further studies are needed to better understand the nature of immune responses to ASFV infection in different pig populations.
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Affiliation(s)
- Hung Q Luong
- Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi 12406, Viet Nam
| | - Huong Tl Lai
- Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi 12406, Viet Nam
| | - Luc D Do
- Faculty of Animal Science, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi 12406, Viet Nam
| | - Bo X Ha
- Faculty of Animal Science, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi 12406, Viet Nam
| | - Giap V Nguyen
- Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi 12406, Viet Nam
| | - Hiep Lx Vu
- Nebraska Center for Virology and Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583-0900, USA.
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19
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Tian L, Luo Y, Wen T, Yang W, Zhao Y, Huang P, He H, Wu J, Li Z, Pan C. A quadruple protection procedure for resuming pig production in small-scale ASFV-positive farms in China. CURRENT RESEARCH IN MICROBIAL SCIENCES 2021; 2:100014. [PMID: 34841307 PMCID: PMC8610312 DOI: 10.1016/j.crmicr.2020.100014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/03/2020] [Accepted: 11/03/2020] [Indexed: 11/26/2022] Open
Abstract
African swine fever outbreak has caused serious economic losses in China. Pork supply in consequence faces huge demand. The small-scale farms in China are encountering difficulties in raising pigs. A comprehensive procedure was tested in 35 small pig farms that had been confirmed with African swine fever virus. During a one-year study, 100 percent of porkers and 98.8 percent of sows were healthy respectively. An effective biosafety procedure was developed for production of pigs in small-scale farms in China.
African swine fever (ASF) outbreak has caused serious economic losses in Asia since 2018. As ASF is a new emerging disease, many farmers hesitate to raise pigs before biosafety procedures were evaluated to be effective. To support small-scale farms in resuming pig production, a comprehensive procedure, called the quadruple protection procedure (QPP), was tested in 35 small farms which had been confirmed with African swine fever virus (ASFV). The QPP takes care of the farms' construction, environmental disinfection, regular immunization, and feed quality. Qualified daily management was supplemented as well. During a one-year survey four disinfectants and one piece of equipment were used in higher frequency. A 7- or 15-day empty period after the disinfection was suitable when it was combined with the rest of the protection measures from QPP. Totally 18,730 porkers and 3,006 sows were healthy by the end of the study with percentage of 100 and 98.8, respectively, indicating that QPP could protect pigs in small-scale farms from pathogens within China. This study developed an effective protective procedure system for small-scale farms to produce pigs under the risk of ASF outbreak.
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Affiliation(s)
- Lang Tian
- Institute of Animal Protection Technology, Haid Research Institute, Guangdong Haid Group Co., Ltd., Guangzhou, China
| | - Yilin Luo
- Institute of Animal Protection Technology, Haid Research Institute, Guangdong Haid Group Co., Ltd., Guangzhou, China
| | - Tanqing Wen
- Institute of Animal Protection Technology, Haid Research Institute, Guangdong Haid Group Co., Ltd., Guangzhou, China
| | - Weizheng Yang
- Laboratory of Molecular Virology and Immunology, Innovation Technology Center, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China.,School of Life Sciences, Bengbu Medical College, Bengbu, Anhui, China
| | - Yulin Zhao
- Laboratory of Molecular Virology and Immunology, Innovation Technology Center, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China
| | - Pan Huang
- Laboratory of Molecular Virology and Immunology, Innovation Technology Center, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China
| | - Hongbo He
- Institute of Animal Protection Technology, Haid Research Institute, Guangdong Haid Group Co., Ltd., Guangzhou, China
| | - Jianmin Wu
- Guangdong Provincial Key Laboratory of Research on the Technology of Pig-breeding and Pig-disease prevention, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China
| | - Zhongsheng Li
- Guangdong Provincial Key Laboratory of Research on the Technology of Pig-breeding and Pig-disease prevention, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China
| | - Chungen Pan
- Laboratory of Molecular Virology and Immunology, Innovation Technology Center, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research on the Technology of Pig-breeding and Pig-disease prevention, Haid Research Institute, Guangdong Haid Group Co., Ltd, Guangzhou, China
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20
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Dynamic Variations in Infrared Skin Temperature of Weaned Pigs Experimentally Inoculated with the African Swine Fever Virus: A Pilot Study. Vet Sci 2021; 8:vetsci8100223. [PMID: 34679053 PMCID: PMC8541399 DOI: 10.3390/vetsci8100223] [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: 09/09/2021] [Revised: 09/30/2021] [Accepted: 10/06/2021] [Indexed: 11/17/2022] Open
Abstract
African swine fever (ASF) is a devastating viral disease in pigs and is therefore economically important for the swine industry. ASF is characterized by a short incubation period and immediate death, making the early identification of ASF-infected pigs essential. This pilot-scale study evaluates whether the infrared thermography (IRT) technique can be used as a diagnostic tool to detect changes in skin temperature (Tsk) during the early stages of disease development in experimentally ASF-infected pigs. Clinical symptoms and rectal temperatures (Tcore) were recorded daily, and IRT readings during the experimental ASF infection were analyzed. All infected pigs died at 5–8 days post inoculation (dpi), and the incubation period was approximately 4 dpi. The average Tcore increased from 0 dpi (38.9 ± 0.3 °C) to 7 dpi (41.0 ± 0.5 °C) and decreased by 8 dpi (39.8 ± 0 °C). The maximum Tsk of ASF-infected pigs increased from 2 (35.0 °C) to 3 dpi (38.5 °C). The mean maximum Tsk observed from three regions on the skin (ear, inguinal, and neck) significantly increased from 2 to 3 dpi. This study presents a non-contact method for the early detection of ASF in infected pigs using thermal imaging at 3 days after ASF infection.
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21
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Oh T, Do DT, Lai DC, Nguyen TC, Vo HV, Chae C. Age-related viral load and severity of systemic pathological lesions in acute naturally occurring African swine fever virus genotype II infections. Comp Immunol Microbiol Infect Dis 2021; 79:101709. [PMID: 34543808 DOI: 10.1016/j.cimid.2021.101709] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 11/17/2022]
Abstract
African swine fever (ASF) causes a contagious hemorrhagic disease in all ages of pigs without sex predilections. The objective of this study was to determine the age-related viral loads and severity of systemic pathological lesions among three different swine group ages (weaned pigs, fattening pigs, and sows) during a recent outbreak of acute ASF in Vietnam. Age-related viral loads were determined in 5 major organs (lung, liver, spleen, kidney, and lymph node) by immunohistochemistry as well as in the blood by real-time polymerase chain reaction (PCR). Age-related systemic pathological lesions were analyzed in the listed organs among three age groups. Weaned pigs had significantly (p < 0.05) higher levels of viral loads in their lung, liver, lymph nodes and blood than in those of fattening pigs and sows. Fattening pigs had significantly (p < 0.05) higher scores of macroscopic lung and lymphoid lesions, and microscopic liver lesions compared with those of weaned pigs and sows. The results of this study demonstrated that viral loads were age-related in acute naturally occurring ASF but the severity of pathological lesions was not correlated with the level of viral loads in the five major organs.
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Affiliation(s)
- Taehwan Oh
- Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Duy Tien Do
- Faculty of Animal Sciences and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Danh Cong Lai
- Faculty of Animal Sciences and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Thanh Che Nguyen
- Faculty of Animal Sciences and Veterinary Medicine, Nong Lam University, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Hung Van Vo
- Department of Animal Health, Center for Veterinary Diagnostics, Regional Animal Health Office No. 6, Ho Chi Minh City, Viet Nam
| | - Chanhee Chae
- Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
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22
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Report on the First African Swine Fever Case in Greece. Vet Sci 2021; 8:vetsci8080163. [PMID: 34437485 PMCID: PMC8402752 DOI: 10.3390/vetsci8080163] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/04/2021] [Accepted: 08/06/2021] [Indexed: 11/16/2022] Open
Abstract
African swine fever (ASF) poses a major threat to swine health and welfare worldwide. After several European countries have reported cases of ASF, Greece confirmed officially the first positive case on 5 February 2020. The owner of a backyard farm in Nikoklia, a village in Serres regional unit, Central Macedonia, reported a loss of appetite, weakness, dyspnea, and the sudden death of 6 domestic pigs. Necropsy was performed in one gilt and findings were compatible with acute to subacute septicemic disease. Predominantly, hyperemic enlargement of spleen and lymph node enlargement and/or hemorrhage were observed. Description of vague clinical signs by the farmer suggested a limited resemblance to ASF-acute infection. However, the disease could not be ruled out once septicemic condition including splenomegaly, was diagnosed macroscopically at necropsy. In addition, considering the farm’s location near to ASF protection zones, a further diagnostic investigation followed. Confirmation of the disease was obtained using a series of diagnostic tests on several tissue samples. Further clinical, molecular, and epidemiologic evaluation of the farm was performed. According to the contingency plan, authorities euthanized all 31 pigs on the farm, whilst blood testing revealed ASF virus infection. Further emergency measures were implemented to contain the spread of the disease.
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23
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Kim YJ, Park B, Kang HE. Control measures to African swine fever outbreak: active response in South Korea, preparation for the future, and cooperation. J Vet Sci 2021; 22:e13. [PMID: 33522165 PMCID: PMC7850787 DOI: 10.4142/jvs.2021.22.e13] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 12/08/2020] [Accepted: 12/13/2020] [Indexed: 11/25/2022] Open
Abstract
African swine fever (ASF) is one of the most complex infectious swine diseases and the greatest concern to the pig industry owing to its high mortality and no effective vaccines available to prevent the disease. Since the first outbreak of ASF in pig farms, ASF has been identified in 14 pig farms in four cities/counties in South Korea. The outbreak was resolved in a short period because of the immediate control measures and cooperative efforts. This paper reviews the ASF outbreak and the experience of successfully stopping ASF in pig farms in South Korea through active responses to prevent the spread of ASF. In addition, suitable changes to build a sustainable pig production system and collaborative efforts to overcome the dangerous animal disease, such as ASF, are discussed.
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Affiliation(s)
- Yong Joo Kim
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea
| | - Bongkyun Park
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea.,Department of Veterinary Medicine Virology Lab, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Korea
| | - Hae Eun Kang
- Foreign Animal Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea.
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24
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Gallardo C, Soler A, Nurmoja I, Cano-Gómez C, Cvetkova S, Frant M, Woźniakowski G, Simón A, Pérez C, Nieto R, Arias M. Dynamics of African swine fever virus (ASFV) infection in domestic pigs infected with virulent, moderate virulent and attenuated genotype II ASFV European isolates. Transbound Emerg Dis 2021; 68:2826-2841. [PMID: 34273247 DOI: 10.1111/tbed.14222] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 06/28/2021] [Accepted: 07/04/2021] [Indexed: 01/15/2023]
Abstract
This study aimed to compare the infection dynamics of three genotype II African swine fever viruses (ASFV) circulating in Europe. Eighteen domestic pigs divided into three groups were infected intramuscularly or by direct contact with two haemadsorbent ASFVs (HAD) from Poland (Pol16/DP/ OUT21) and Estonia (Est16/WB/Viru8), and with the Latvian non-HAD ASFV (Lv17/WB/Rie1). Parameters, such as symptoms, pathogenicity, and distribution of the virus in tissues, humoral immune response, and dissemination of the virus by blood, oropharyngeal and rectal routes, were investigated. The Polish ASFV caused a case of rapidly developing fatal acute disease, while the Estonian ASFV caused acute to sub-acute infections and two animals survived. In contrast, animals infected with the ASFV from Latvia developed a more subtle, mild, or even subclinical disease. Oral excretion was sporadic or even absent in the attenuated group, whereas in animals that developed an acute or sub-acute form of ASF, oral excretion began at the same time the ASFV was detected in the blood, or even 3 days earlier, and persisted up to 22 days. Regardless of virulence, blood was the main route of transmission of ASFV and infectious virus was isolated from persistently infected animals for at least 19 days in the attenuated group and up to 44 days in the group of moderate virulence. Rectal excretion was limited to the acute phase of infection. In terms of diagnostics, the ASFV genome was detected in contact pigs from oropharyngeal samples earlier than in blood, independently of virulence. Together with blood, both samples could allow to detect ASFV infection for a longer period. The results presented here provide quantitative data on the spread and excretion of ASFV strains of different virulence among domestic pigs that can help to better focus surveillance activities and, thus, increase the ability to detect ASF introductions earlier.
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Affiliation(s)
- Carmina Gallardo
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Alejandro Soler
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Imbi Nurmoja
- Estonian Veterinary and Food Laboratory, Estonian ASF-National reference laboratory (NRL), Kreutzwaldi, Tartu, Estonia
| | - Cristina Cano-Gómez
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Svetlana Cvetkova
- Laboratory of Microbiology and Pathology Institute of Food Safety, Animal Health and Enviroment, BIOR, Latvian ASF-National reference laboratory, Lejupes, Riga, Latvia
| | - Maciej Frant
- National Veterinary Research Institute, Poland ASF-National reference laboratory, Partyzantow, Pulawy, Poland
| | - Grzegorz Woźniakowski
- National Veterinary Research Institute, Poland ASF-National reference laboratory, Partyzantow, Pulawy, Poland.,Department of Diagnostics and Clinical Sciences, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Toruń, Lwowska, Toruń, Poland
| | - Alicia Simón
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Covadonga Pérez
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Raquel Nieto
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
| | - Marisa Arias
- Centro de Investigación en Sanidad Animal, CISA, INIA-CSIC, European Union Reference Laboratory for African Swine Fever (EURL), Valdeolmos, Madrid, Spain
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25
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Lee HS, Bui VN, Dao DT, Bui NA, Le TD, Kieu MA, Nguyen QH, Tran LH, Roh JH, So KM, Hur TY, Oh SI. Pathogenicity of an African swine fever virus strain isolated in Vietnam and alternative diagnostic specimens for early detection of viral infection. Porcine Health Manag 2021; 7:36. [PMID: 33934707 PMCID: PMC8091783 DOI: 10.1186/s40813-021-00215-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 04/21/2021] [Indexed: 11/17/2022] Open
Abstract
Background African swine fever (ASF), caused by the ASF virus (ASFV), was first reported in Vietnam in 2019 and spread rapidly thereafter. Better insights into ASFV characteristics and early detection by surveillance could help control its spread. However, the pathogenicity and methods for early detection of ASFV isolates from Vietnam have not been established. Therefore, we investigated the pathogenicity of ASFV and explored alternative sampling methods for early detection. Results Ten pigs were intramuscularly inoculated with an ASFV strain from Vietnam (titer, 103.5 HAD50/mL), and their temperature, clinical signs, and virus excretion patterns were recorded. In addition, herd and environmental samples were collected daily. The pigs died 5–8 days-post-inoculation (dpi), and the incubation period was 3.7 ± 0.5 dpi. ASFV genome was first detected in the blood (2.2 ± 0.8) and then in rectal (3.1 ± 0.7), nasal (3.2 ± 0.4), and oral (3.6 ± 0.7 dpi) swab samples. ASFV was detected in oral fluid samples collected using a chewed rope from 3 dpi. The liver showed the highest viral loads, and ear tissue also exhibited high viral loads among 11 tissues obtained from dead pigs. Overall, ASFV from Vietnam was classified as peracute to acute form. The rope-based oral fluid collection method could be useful for early ASFV detection and allows successful ASF surveillance in large pig farms. Furthermore, ear tissue samples might be a simple alternative specimen for diagnosing ASF infection in dead pigs. Conclusions Our data provide valuable insights into the characteristics of a typical ASFV strain isolated in Vietnam and suggest an alternative, non-invasive specimen collection strategy for early detection.
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Affiliation(s)
- Hu Suk Lee
- International Livestock Research Institute (ILRI), Hanoi, Vietnam
| | - Vuong Nghia Bui
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Duy Tung Dao
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Ngoc Anh Bui
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Thanh Duy Le
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Minh Anh Kieu
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Quang Huy Nguyen
- International Livestock Research Institute (ILRI), Hanoi, Vietnam.,Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Long Hoang Tran
- Virology Department, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
| | - Jae-Hee Roh
- Division of Animal Disease & Health, National Institute of Animal Science, Rural Development Administration, 55365, Wanju, Republic of Korea
| | - Kyoung-Min So
- Division of Animal Disease & Health, National Institute of Animal Science, Rural Development Administration, 55365, Wanju, Republic of Korea
| | - Tai-Young Hur
- Division of Animal Disease & Health, National Institute of Animal Science, Rural Development Administration, 55365, Wanju, Republic of Korea
| | - Sang-Ik Oh
- Division of Animal Disease & Health, National Institute of Animal Science, Rural Development Administration, 55365, Wanju, Republic of Korea.
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26
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Development of Diagnostic Tests Provides Technical Support for the Control of African Swine Fever. Vaccines (Basel) 2021; 9:vaccines9040343. [PMID: 33918128 PMCID: PMC8067252 DOI: 10.3390/vaccines9040343] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/11/2021] [Accepted: 03/16/2021] [Indexed: 11/17/2022] Open
Abstract
African swine fever is a highly contagious global disease caused by the African swine fever virus. Since African swine fever (ASF) was introduced to Georgia in 2007, it has spread to many Eurasian countries at an extremely fast speed. It has recently spread to China and other major pig-producing countries in southeast Asia, threatening global pork production and food security. As there is no available vaccine at present, prevention and control must be carried out based on early detection and strict biosecurity measures. Early detection should be based on the rapid identification of the disease on the spot, followed by laboratory diagnosis, which is essential for disease control. In this review, we introduced the prevalence, transmission routes, eradication control strategies, and diagnostic methods of ASF. We reviewed the various methods of diagnosing ASF, focusing on their technical characteristics and clinical test results. Finally, we give some prospects for improving the diagnosis strategy in the future.
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