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Zhu H, Wang G, Liu X, Wu W, Yu T, Zhang W, Liu X, Cheng G, Wei L, Ni L, Peng Z, Li X, Xu D, Qian P, Chen P. Establishment and application of a quadruplex real-time RT-qPCR assay for differentiation of TGEV, PEDV, PDCoV, and PoRVA. Microb Pathog 2024; 191:106646. [PMID: 38631414 DOI: 10.1016/j.micpath.2024.106646] [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: 12/18/2023] [Revised: 04/02/2024] [Accepted: 04/13/2024] [Indexed: 04/19/2024]
Abstract
Porcine viral diarrhea is a common ailment in clinical settings, causing significant economic losses to the swine industry. Notable culprits behind porcine viral diarrhea encompass transmissible gastroenteritis virus (TGEV), porcine epidemic diarrhea virus (PEDV), porcine deltacoronavirus (PDCoV), and porcine rotavirus-A (PoRVA). Co-infections involving the viruses are a common occurrence in clinical settings, thereby amplifying the complexities associated with differential diagnosis. As a consequence, it is therefore necessary to develop a method that can detect and differentiate all four porcine diarrhea viruses (TGEV, PEDV, PDCoV, and PoRVA) with a high sensitivity and specificity. Presently, polymerase chain reaction (PCR) is the go-to method for pathogen detection. In comparison to conventional PCR, TaqMan real-time PCR offers heightened sensitivity, superior specificity, and enhanced accuracy. This study aimed to develop a quadruplex real-time RT-qPCR assay, utilizing TaqMan probes, for the distinctive detection of TGEV, PEDV, PDCoV, and PoRVA. The quadruplex real-time RT-qPCR assay, as devised in this study, exhibited the capacity to avoid the detection of unrelated pathogens and demonstrated commendable specificity, sensitivity, repeatability, and reproducibility, boasting a limit of detection (LOD) of 27 copies/μL. In a comparative analysis involving 5483 clinical samples, the results from the commercial RT-qPCR kit and the quadruplex RT-qPCR for TGEV, PEDV, PDCoV, and PoRVA detection were entirely consistent. Following sample collection from October to March in Guangxi Zhuang Autonomous Region, we assessed the prevalence of TGEV, PEDV, PDCoV, and PoRVA in piglet diarrhea samples, revealing positive detection rates of 0.2 % (11/5483), 8.82 % (485/5483), 1.22 % (67/5483), and 4.94 % (271/5483), respectively. The co-infection rates of PEDV/PoRVA, PEDV/PDCoV, TGEV/PED/PoRVA, and PDCoV/PoRVA were 0.39 %, 0.11 %, 0.01 %, and 0.03 %, respectively, with no detection of other co-infections, as determined by the quadruplex real-time RT-qPCR. This research not only established a valuable tool for the simultaneous differentiation of TGEV, PEDV, PDCoV, and PoRVA in practical applications but also provided crucial insights into the prevalence of these viral pathogens causing diarrhea in Guangxi.
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Affiliation(s)
- Hechao Zhu
- Guangxi Yangxiang Co., LTD, Guigang, 537100, China; National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Geng Wang
- Guangxi Yangxiang Co., LTD, Guigang, 537100, China
| | - Xiangzu Liu
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Wenqing Wu
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Teng Yu
- Guangxi Yangxiang Co., LTD, Guigang, 537100, China
| | | | - Xiangdong Liu
- Guangxi Yangxiang Co., LTD, Guigang, 537100, China; College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Guofu Cheng
- College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Liuqing Wei
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Lumei Ni
- Guangxi Yangxiang Co., LTD, Guigang, 537100, China
| | - Zhong Peng
- College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Xiangmin Li
- College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Dequan Xu
- College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Ping Qian
- National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Pin Chen
- College of Animal Science & Technology, Collegel of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei, China.
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Chen J, Tian L, Liu Y, Sun Y, Li Z, Cai X, Meng Q, Qiao J. Molecular characterization and phylogenetic analysis of porcine epidemic diarrhea virus in Xinjiang, China, from 2020 to 2022. Arch Virol 2024; 169:96. [PMID: 38619633 DOI: 10.1007/s00705-024-06029-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 02/18/2024] [Indexed: 04/16/2024]
Abstract
In recent years, the pig industry in Xinjiang, China, has been severely impacted by outbreaks of porcine epidemic diarrhea (PED), despite vaccination efforts. In this study, we investigated the genetic characteristics of currently prevalent porcine epidemic diarrhea virus (PEDV) strains in the region. We collected 548 samples from animals with suspected PED on large-scale pig farms in Xinjiang. Of these, 258 tested positive for PEDV by RT-PCR, yielding an overall positivity rate of 47.08%. S1 gene sequencing and phylogenetic analysis were conducted on 23 randomly selected RT-PCR-positive samples. Three endemic strains of PEDV (PEDV/CH/XU/2020, PEDV/CH/XK/2020, and PEDV/CH/XA/2020) were isolated, and their complete genome sequences were analyzed for evidence of genetic recombination. Sequence comparison of the S gene indicated significant variations in the S1 gene of the Xinjiang strains compared to the vaccine strains CV777, AJ1102, and LWL, with 90.2%-98.5% nucleotide sequence identity. Notably, both the N-terminal and C-terminal domains of the S protein showed significant variation. Genetic evolutionary analysis identified the GIIa subtype as the dominant genotype among the epidemic strains in Xinjiang. Recombination analysis revealed inter-subtype recombination events in the PEDV/CH/XK/2020 and XJ1904-34 strains. These findings highlight the extensive genetic variation in the predominant GIIa genotype of PEDV in Xinjiang, which does not match the genotype of the currently used vaccine strains. These data may guide further efforts toward the development of effective vaccines for the control of PED.
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Affiliation(s)
- Jinlong Chen
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Lulu Tian
- Xinjiang Agricultural Vocational and Technical College, Changji, 831100, Xinjiang, China
| | - Yucheng Liu
- Institute of Animal Science and Veterinary Research, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi, 832000, Xinjiang, China
| | - Yaoqiang Sun
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Zhiyuan Li
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Xuepeng Cai
- State Key Lab of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Qingling Meng
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China.
| | - Jun Qiao
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China.
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Song W, Feng Y, Zhang J, Kong D, Fan J, Zhao M, Hua L, Xiang J, Tang X, Xiao S, Peng Z, Wu B. Development of a multiplex reverse transcription-quantitative PCR (qPCR) method for detecting common causative agents of swine viral diarrhea in China. Porcine Health Manag 2024; 10:12. [PMID: 38444040 PMCID: PMC10916220 DOI: 10.1186/s40813-024-00364-y] [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: 12/13/2023] [Accepted: 02/25/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND Diarrheal diseases caused by viral agents have led to a great morbidity, mortality, and economic loss in global pig industry. Porcine epidemic diarrhea virus (PEDV), transmissible gastroenteritis virus (TGEV), porcine deltacoronavirus (PDCoV), and group A porcine rotavirus (RVA) are main causative agents of swine viral diarrhea with similar clinical signs on Chinese farms and their co-infection is also common. However, it is still lack of a convenient method to detect these four agents. METHODS A TaqMan multiplex qPCR method was developed to detect PEDV, TGEV, PDCoV, and RVA, simultaneously. This method was then applied to investigate 7,342 swine fecal samples or rectal swabs, as well as 1,246 swine intestinal samples collected from 2075 farms in China in 2022. RESULTS Minimum detection limits of this method were 3 copies/µL for PEDV, 4 copies/µL for TGEV, 8 copies/µL for RVA, and 8 copies/µL for PDCoV, suggesting a good sensitivity. No signals were observed by using this method detecting other viral agents commonly prevalent in pigs, which is suggestive of a good specificity. Application of this method on investigating clinical samples demonstrated a relatively high positive rate for PEDV (22.21%, 1907/8588) and RVA (44.00%, 3779/8588). In addition, co-infection between PEDV and RVA was observed on 360 investigated farms, accounting for 17.35% (360/2075) of the farms where co-infection events were screened. CONCLUSIONS A TaqMan multiplex qPCR method targeting PEDV, TGEV, PDCoV, and RVA was developed in this study. This method demonstrated a good specificity and sensitivity on investigating these four common viruses responsible for viral diarrhea on Chinese pig farms, which represents a convenient method for the monitoring and differential diagnosis of swine viral diarrhea.
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Affiliation(s)
- Wenbo Song
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China
- Hubei Hongshan Laboratory, 430070, Wuhan, China
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China
| | - Yixue Feng
- Animal Disease Diagnosis Center of Wuhan Keqian Biology Co., Ltd, 430070, Wuhan, China
| | - Jiali Zhang
- Animal Disease Diagnosis Center of Wuhan Keqian Biology Co., Ltd, 430070, Wuhan, China
| | - Danni Kong
- Animal Disease Diagnosis Center of Wuhan Keqian Biology Co., Ltd, 430070, Wuhan, China
| | - Jie Fan
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China
- Hubei Hongshan Laboratory, 430070, Wuhan, China
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China
| | - Mengfei Zhao
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China
- Hubei Hongshan Laboratory, 430070, Wuhan, China
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China
| | - Lin Hua
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China
- Hubei Hongshan Laboratory, 430070, Wuhan, China
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China
| | - Jinmei Xiang
- Hubei Vocational College of Bio-Technology, 430070, Wuhan, China
| | - Xibiao Tang
- Animal Disease Diagnosis Center of Wuhan Keqian Biology Co., Ltd, 430070, Wuhan, China
- Hubei Vocational College of Bio-Technology, 430070, Wuhan, China
| | - Shaobo Xiao
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China
- Hubei Hongshan Laboratory, 430070, Wuhan, China
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China
| | - Zhong Peng
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China.
- Hubei Hongshan Laboratory, 430070, Wuhan, China.
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China.
| | - Bin Wu
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, 430070, Wuhan, China.
- Frontiers Science Center for Animal Breeding and Sustainable Production, The Cooperative Innovation Center for Sustainable Pig Production, 430070, Wuhan, China.
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Brnić D, Vlahović D, Gudan Kurilj A, Maltar-Strmečki N, Lojkić I, Kunić V, Jemeršić L, Bačani I, Kompes G, Beck R, Mikuletič T, Steyer A. The impact and complete genome characterisation of viruses involved in outbreaks of gastroenteritis in a farrow-to-finish holding. Sci Rep 2023; 13:18780. [PMID: 37907693 PMCID: PMC10618538 DOI: 10.1038/s41598-023-45994-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 10/26/2023] [Indexed: 11/02/2023] Open
Abstract
Viral enteric pathogens continuously burden intensive pig farming, causing gastrointestinal diseases of epidemic and endemic nature. The present study investigated two diarrhoea outbreaks on a large farrow-to-finish holding and subsequent circulation of outbreak-related enteric viruses. These viruses were characterised by whole genome sequencing, and statistical evaluation of the impact on specific production metrics was performed. The results provided evidence that the Porcine epidemic diarrhoea virus-swine enteric coronavirus (PEDV-SeCoV) S gene recombinant strain was responsible for the first outbreak, whilst Rotavirus A (RVA) in a mixed infection with Rotavirus B (RVB) and porcine kobuvirus (PKV) probably caused the second diarrhoea outbreak. Whole genome characterisation revealed a porcine origin of all viruses involved and significant heterogeneity of RVB strain, proposing four novel genotypes and changes in RVB VP1 genotype classification. The statistical evaluation confirmed only a minor disturbance in the number of weaned pigs per sow, with statistical forecasting showing positive trends. A follow-up study corroborated the endemicity of RVA and PKV, in contrast to PEDV-SeCoV. Punctual, comprehensive and timely investigation of diarrhoea outbreaks is a prerequisite for applying adequate pig health and biosecurity management. Calculating such outbreaks' impact on production metrics can potentially shape future decisions on management improvements.
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Affiliation(s)
- Dragan Brnić
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia.
| | - Dunja Vlahović
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
- Department of Veterinary Pathology, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000, Zagreb, Croatia
| | - Andrea Gudan Kurilj
- Department of Veterinary Pathology, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000, Zagreb, Croatia
| | - Nadica Maltar-Strmečki
- Laboratory for Electron Spin Spectroscopy, Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Ivana Lojkić
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
| | - Valentina Kunić
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
| | - Lorena Jemeršić
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
| | - Ivica Bačani
- Animal Feed Factory, Dr Ivana Novaka 11, 40000, Čakovec, Croatia
| | - Gordan Kompes
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
| | - Relja Beck
- Croatian Veterinary Institute, Savska cesta 143, 10000, Zagreb, Croatia
| | - Tina Mikuletič
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000, Ljubljana, Slovenia
| | - Andrej Steyer
- Division of Public Health Microbiology, National Laboratory of Health, Environment and Food, Grablovičeva 44, 1000, Ljubljana, Slovenia
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5
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Lazov CM, Papetti A, Belsham GJ, Bøtner A, Rasmussen TB, Boniotti MB. Multiplex Real-Time RT-PCR Assays for Detection and Differentiation of Porcine Enteric Coronaviruses. Pathogens 2023; 12:1040. [PMID: 37624000 PMCID: PMC10457881 DOI: 10.3390/pathogens12081040] [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: 06/26/2023] [Revised: 08/02/2023] [Accepted: 08/10/2023] [Indexed: 08/26/2023] Open
Abstract
It is important to be able to detect and differentiate between distinct porcine enteric coronaviruses that can cause similar diseases. However, the existence of naturally occurring recombinant coronaviruses such as swine enteric coronavirus (SeCoV) can give misleading results with currently used diagnostic methods. Therefore, we have developed and validated three duplex real-time quantitative RT-PCR assays for the simultaneous detection of, and differentiation between, porcine epidemic diarrhea virus (PEDV) and SeCoV. Transmissible gastroenteritis virus (TGEV) is also detected by two out of these three assays. In addition, a novel triplex assay was set up that was able to detect and differentiate between these alphacoronaviruses and the porcine deltacoronavirus (PDCoV). The validated assays have low limits of detection, close to 100% efficiency, and were able to correctly identify the presence of PEDV and SeCoV in 55 field samples, whereas 20 samples of other pathogens did not give a positive result. Implementing one or more of these multiplex assays into the routine diagnostic surveillance for PEDV will ensure that the presence of SeCoV, TGEV, and PDCoV will not go unnoticed.
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Affiliation(s)
- Christina M. Lazov
- DTU Institute of Bioengineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;
- Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna, IZSLER, Reparto Tecnologie Biologiche Applicate, Via Bianchi, 9, 25124 Brescia, Italy
- Department of Veterinary and Animal Sciences, University of Copenhagen, 4 Stigboejlen, 1870 Frederiksberg, Denmark
| | - Alice Papetti
- Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna, IZSLER, Reparto Tecnologie Biologiche Applicate, Via Bianchi, 9, 25124 Brescia, Italy
| | - Graham J. Belsham
- Department of Veterinary and Animal Sciences, University of Copenhagen, 4 Stigboejlen, 1870 Frederiksberg, Denmark
| | - Anette Bøtner
- Department of Veterinary and Animal Sciences, University of Copenhagen, 4 Stigboejlen, 1870 Frederiksberg, Denmark
| | - Thomas Bruun Rasmussen
- Department of Virus & Microbiological Special Diagnostics, Statens Serum Institut, 5 Artillerivej, 2300 Copenhagen, Denmark
| | - Maria Beatrice Boniotti
- Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna, IZSLER, Reparto Tecnologie Biologiche Applicate, Via Bianchi, 9, 25124 Brescia, Italy
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Shurson GC, Urriola PE, Schroeder DC. Biosecurity and Mitigation Strategies to Control Swine Viruses in Feed Ingredients and Complete Feeds. Animals (Basel) 2023; 13:2375. [PMID: 37508151 PMCID: PMC10376163 DOI: 10.3390/ani13142375] [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: 06/16/2023] [Revised: 07/17/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
No system nor standardized analytical procedures at commercial laboratories exist to facilitate and accurately measure potential viable virus contamination in feed ingredients and complete feeds globally. As a result, there is high uncertainty of the extent of swine virus contamination in global feed supply chains. Many knowledge gaps need to be addressed to improve our ability to prevent virus contamination and transmission in swine feed. This review summarizes the current state of knowledge involving: (1) the need for biosecurity protocols to identify production, processing, storage, and transportation conditions that may cause virus contamination of feed ingredients and complete feed; (2) challenges of measuring virus inactivation; (3) virus survival in feed ingredients during transportation and storage; (4) minimum infectious doses; (5) differences between using a food safety objective versus a performance objective as potential approaches for risk assessment in swine feed; (6) swine virus inactivation from thermal and irradiation processes, and chemical mitigants in feed ingredients and complete feed; (7) efficacy of virus decontamination strategies in feed mills; (8) benefits of functional ingredients, nutrients, and commercial feed additives in pig diets during a viral health challenge; and (9) considerations for improved risk assessment models of virus contamination in feed supply chains.
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Affiliation(s)
- Gerald C Shurson
- Department of Animal Science, University of Minnesota, St. Paul, MN 55108, USA
| | - Pedro E Urriola
- Department of Animal Science, University of Minnesota, St. Paul, MN 55108, USA
| | - Declan C Schroeder
- Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN 55108, USA
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Death Receptor DR5 as a Proviral Factor for Viral Entry and Replication of Coronavirus PEDV. Viruses 2022; 14:v14122724. [PMID: 36560727 PMCID: PMC9783156 DOI: 10.3390/v14122724] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 11/29/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
Porcine epidemic diarrhea virus (PEDV), a member of Coronaviridae, causes high mortality in newborn piglets, and has caused significant economic losses in the pig industry. PEDV infection can induce apoptosis, both caspase-dependent and caspase-independent, but the details of apoptosis remain clarified. This study investigated the effect of death receptor DR5 on PEDV infection and its relationship with PEDV-induced apoptosis. We found that DR5 knockdown reduced viral mRNA and protein levels of PEDV, and the viral titer decreased from 104.5 TCID50 to 103.4 TCID50 at 12 hpi. Overexpression of DR5 significantly increased the viral titer. Further studies showed that DR5 facilitates viral replication by regulating caspase-8-dependent apoptosis, and the knockdown of DR5 significantly reduced PEDV-induced apoptosis. Interestingly, we detected a biphasic upregulation expression of DR5 in both Vero cells and piglets in response to PEDV infection. We found that DR5 also facilitates viral entry of PEDV, especially, incubation with DR5 antibody can reduce the PEDV binding to Vero cells. Our study improves the understanding of the mechanism by which PEDV induces apoptosis and provides new insights into the biological function of DR5 in PEDV infection.
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Thakor JC, Dinesh M, Manikandan R, Bindu S, Sahoo M, Sahoo D, Dhawan M, Pandey MK, Tiwari R, Emran TB, Dhama K, Chaicumpa W. Swine coronaviruses (SCoVs) and their emerging threats to swine population, inter-species transmission, exploring the susceptibility of pigs for SARS-CoV-2 and zoonotic concerns. Vet Q 2022; 42:125-147. [PMID: 35584308 PMCID: PMC9225692 DOI: 10.1080/01652176.2022.2079756] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 03/23/2022] [Accepted: 05/16/2022] [Indexed: 12/23/2022] Open
Abstract
Swine coronaviruses (SCoVs) are one of the most devastating pathogens affecting the livelihoods of farmers and swine industry across the world. These include transmissible gastroenteritis virus (TGEV), porcine epidemic diarrhea virus (PEDV), porcine respiratory coronavirus (PRCV), porcine hemagglutinating encephalomyelitis virus (PHEV), swine acute diarrhea syndrome coronavirus (SADS-CoV), and porcine delta coronavirus (PDCoV). Coronaviruses infect a wide variety of animal species and humans because these are having single stranded-RNA that accounts for high mutation rates and thus could break the species barrier. The gastrointestinal, cardiovascular, and nervous systems are the primary organ systems affected by SCoVs. Infection is very common in piglets compared to adult swine causing high mortality in the former. Bat is implicated to be the origin of all CoVs affecting animals and humans. Since pig is the only domestic animal in which CoVs cause a wide range of diseases; new coronaviruses with high zoonotic potential could likely emerge in the future as observed in the past. The recently emerged severe acute respiratory syndrome coronavirus virus-2 (SARS-CoV-2), causing COVID-19 pandemic in humans, has been implicated to have animal origin, also reported from few animal species, though its zoonotic concerns are still under investigation. This review discusses SCoVs and their epidemiology, virology, evolution, pathology, wildlife reservoirs, interspecies transmission, spill-over events and highlighting their emerging threats to swine population. The role of pigs amid ongoing SARS-CoV-2 pandemic will also be discussed. A thorough investigation should be conducted to rule out zoonotic potential of SCoVs and to design appropriate strategies for their prevention and control.
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Affiliation(s)
- Jigarji C. Thakor
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Murali Dinesh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Rajendran Manikandan
- Immunology Section, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Suresh Bindu
- Immunology Section, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Monalisa Sahoo
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Diptimayee Sahoo
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Manish Dhawan
- Department of Microbiology, Punjab Agricultural University, Ludhiana, India
- The Trafford Group of Colleges, Manchester, United Kingdom
| | - Megha Katare Pandey
- Department of Translational Medicine Center, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
| | - Ruchi Tiwari
- Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sansthan (DUVASU), Mathura, India
| | - Talha Bin Emran
- Department of Pharmacy, BGC Trust University Bangladesh, Chittagong, Bangladesh
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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Niu JW, Li JH, Guan JL, Deng KH, Wang XW, Li G, Zhou X, Xu MS, Chen RA, Zhai SL, He DS. Development of a multiplex RT-PCR method for the detection of four porcine enteric coronaviruses. Front Vet Sci 2022; 9:1033864. [PMID: 36425116 PMCID: PMC9679136 DOI: 10.3389/fvets.2022.1033864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 10/25/2022] [Indexed: 11/03/2023] Open
Abstract
Porcine enteric coronaviruses are pathogens that cause viral diarrhea in pigs and are widely prevalent worldwide. Moreover, studies have shown that some porcine enteric coronaviruses can infect humans and poultry. In order to effectively monitor these viruses, it is necessary to establish a multiple detection method to understand their prevalence and conduct in-depth research. Common porcine enteric coronaviruses include Porcine epidemic diarrhea virus (PEDV), Porcine transmissible gastroenteritis virus (TGEV), Porcine delta coronavirus (PDCoV), and Swine acute diarrhea syndrome coronavirus (SADS-CoV). Pigs infected with these viruses have the common clinical symptoms that are difficult to distinguish. A quadruplex RT-PCR (reverse transcription-polymerase chain reaction) method for the simultaneous detection of PEDV, PDCoV, TGEV and SADS-CoV was developed. Four pairs of specific primers were designed for the PEDV M gene, PDCoV N gene, TGEV S gene and SADS-CoV RdRp gene. Multiplex RT-PCR results showed that the target fragments of PDCoV, SADS-CoV, PEDV and TGEV could be amplified by this method. and the specific fragments with sizes of 250 bp, 368 bp, 616 bp and 801 bp were amplified, respectively. This method cannot amplify any fragment of nucleic acids of Seneca Valley virus (SVV), Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) and Atypical Porcine Pestivirus (APPV), and has good specificity. The lowest detection limits of PDCoV, PEDV, TGEV and SADS-CoV were 5.66 × 105 copies/μL, 6.48 × 105 copies/μL, 8.54 × 105 copies/μL and 7.79 × 106 copies/μL, respectively. A total of 94 samples were collected from pig farms were analyzed using this method. There were 15 positive samples for PEDV, 3 positive samples for mixed infection of PEDV and PDCoV, 2 positive samples for mixed infection of PEDV and TGEV, and 1 positive sample for mixed infection of PEDV, TGEV, and PDCoV. Multiplex RT-PCR method could detect four intestinal coronaviruses (PEDV, PDCoV, TGEV, and SADS-CoV) in pigs efficiently, cheaply and accurately, which can be used for clinical large-scale epidemiological investigation and diagnosis.
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Affiliation(s)
- Jia-Wei Niu
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Jin-Hui Li
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Jin-Lian Guan
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Ke-Hui Deng
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Xiu-Wu Wang
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Gen Li
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
| | - Xia Zhou
- Ministry of Agriculture of Rural Affairs, Key Laboratory of Animal Disease Prevention of Guangdong Province, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Guangzhou, China
| | - Min-Sheng Xu
- Ministry of Agriculture of Rural Affairs, Key Laboratory of Animal Disease Prevention of Guangdong Province, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Guangzhou, China
| | - Rui-Ai Chen
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing, China
| | - Shao-Lun Zhai
- Ministry of Agriculture of Rural Affairs, Key Laboratory of Animal Disease Prevention of Guangdong Province, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Guangzhou, China
| | - Dong-Sheng He
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, College of Veterinary Medicine of South China Agricultural University, Guangzhou, China
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing, China
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Puente H, Díaz I, Arguello H, Mencía-Ares Ó, Gómez-García M, Pérez-Pérez L, Vega C, Cortey M, Martín M, Rubio P, Carvajal A. Characterization and cross-protection of experimental infections with SeCoV and two PEDV variants. Transbound Emerg Dis 2022; 69:3225-3237. [PMID: 35918058 DOI: 10.1111/tbed.14674] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/13/2022] [Accepted: 07/25/2022] [Indexed: 02/04/2023]
Abstract
The aim of this study was to characterize the infection of weaned pigs with swine enteric coronavirus (SeCoV) - a chimeric virus most likely originated from a recombination event between porcine epidemic diarrhoea virus (PEDV) and transmissible gastroenteritis virus, or its mutant porcine respiratory coronavirus - and two PEDV G1b variants, including a recently described recombinant PEDV-SeCoV (rPEDV-SeCoV), as well as to determine the degree of cross-protection achieved against the rPEDV-SeCoV. For this purpose, forty-eight 4-week-old weaned pigs were randomly allocated into four groups of 12 animals. Piglets within each group were primary inoculated with one of the investigated viral strains (B: PEDV; C: SeCoV and D: rPEDV-SeCoV) or mock-inoculated (A), and exposed to rPEDV-SeCOV at day 20 post-infection; thus, group A was primary challenged (-/rPEDV-SeCoV), groups B and C were subjected to a heterologous re-challenge (PEDV/rPEDV-SeCoV and SeCoV/rPEDV-SeCoV, respectively), and group D to a homologous re-challenge (rPEDV-SeCoV/rPEDV-SeCoV), Clinical signs, viral shedding, microscopic lesions and specific humoral and cellular immune responses (IgG, IgA, neutralizing antibodies and IgA and IFN-γ-secreting cells) were monitored. After primo-infection, all three viral strains induced an undistinguishable mild-to-moderate clinical disease with diarrhoea as the main sign and villus shortening lesions in the small intestine. In homologous re-challenged pigs, no clinical signs or lesions were observed, and viral shedding was only detected in a single animal. This fact may be explained by the significant high level of rPEDV-SeCoV-specific neutralizing antibodies found in these pigs before the challenge. In contrast, prior exposure to a different PEDV G1b variant or SeCoV only provided partial cross-protection, allowing rPEDV-SeCoV replication and shedding in faeces.
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Affiliation(s)
- Héctor Puente
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain
| | - Ivan Díaz
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Héctor Arguello
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain.,INDEGSAL, Instituto de Desarrollo Ganadero, Universidad de León, León, Spain
| | - Óscar Mencía-Ares
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain
| | - Manuel Gómez-García
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain
| | - Lucía Pérez-Pérez
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain
| | - Clara Vega
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain
| | - Martí Cortey
- Facultat de Veterinària, Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Margarita Martín
- Facultat de Veterinària, Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Pedro Rubio
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain.,INDEGSAL, Instituto de Desarrollo Ganadero, Universidad de León, León, Spain
| | - Ana Carvajal
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad de León, León, Spain.,INDEGSAL, Instituto de Desarrollo Ganadero, Universidad de León, León, Spain
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11
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Blázquez E, Pujols J, Segalés J, Rodríguez C, Campbell J, Russell L, Polo J. Estimated quantity of swine virus genomes based on quantitative PCR analysis in spray-dried porcine plasma samples collected from multiple manufacturing plants. PLoS One 2022; 17:e0259613. [PMID: 35604901 PMCID: PMC9126402 DOI: 10.1371/journal.pone.0259613] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 04/05/2022] [Indexed: 12/04/2022] Open
Abstract
This survey was conducted to estimate the incidence and level of potential viral contamination in commercially collected porcine plasma. Samples of spray dried porcine plasma (SDPP) were collected over a 12- month period from eight spray drying facilities in Spain, England, Northern Ireland, Brazil, Canada, and the United States. In this survey, viral load for several porcine pathogens including SVA, TGEV, PRRSV (EU and US strains), PEDV, PCV-2, SIV, SDCoV and PPV were determined by qPCR. Regression of Ct on TCID50 of serial diluted stock solution of each virus allowed the estimate of potential viral level in SDPP and unprocessed liquid plasma (using typical solids content of commercially collected porcine plasma). In this survey SVA, TGEV or SDCoV were not detected in any of the SDPP samples. Brazil SDPP samples were free of PRRSV and PEDV. Samples of SDPP from North America primarily contained the PRRSV-US strain while the European samples contained the PRRSV-EU strain (except for one sample from each region containing a relatively low estimated level of the alternative PRRSV strain). Estimated viral level tended to be in the range from <1.0 log10 TCID50 to <2.5 log10 TCID50. Estimated level of SIV was the exception with a very low incidence rate but higher estimated viral load <3.9 log10 TCID50. In summary, the incidence of potential viral contamination in commercially collected porcine plasma was variable and estimated virus level in samples containing viral DNA/RNA was relatively low compared with that occurring at the peak viremia during an infection for all viruses or when considering the minimal infectious dose for each of them.
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Affiliation(s)
- Elena Blázquez
- IRTA, Centre de Recerca en Sanitat Animal (CReSA-IRTA), Bellaterra, Barcelona, Spain
- APC EUROPE S.L.U., Granollers, Barcelona, Spain
- OIE Collaborating Centre for the Research and Control of Emerging and Reemerging Swine Diseases in Europe (IRTA-CReSA), Bellaterra, Barcelona, Spain
| | - Joan Pujols
- IRTA, Centre de Recerca en Sanitat Animal (CReSA-IRTA), Bellaterra, Barcelona, Spain
- OIE Collaborating Centre for the Research and Control of Emerging and Reemerging Swine Diseases in Europe (IRTA-CReSA), Bellaterra, Barcelona, Spain
| | - Joaquim Segalés
- OIE Collaborating Centre for the Research and Control of Emerging and Reemerging Swine Diseases in Europe (IRTA-CReSA), Bellaterra, Barcelona, Spain
- Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona (UAB), Bellaterra, Barcelona, Spain
- UAB, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | | | | | | | - Javier Polo
- APC EUROPE S.L.U., Granollers, Barcelona, Spain
- APC LLC, Ankeny, Iowa, United States of America
- * E-mail:
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12
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Monteagudo LV, Benito AA, Lázaro-Gaspar S, Arnal JL, Martin-Jurado D, Menjon R, Quílez J. Occurrence of Rotavirus A Genotypes and Other Enteric Pathogens in Diarrheic Suckling Piglets from Spanish Swine Farms. Animals (Basel) 2022; 12:ani12030251. [PMID: 35158575 PMCID: PMC8833434 DOI: 10.3390/ani12030251] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 02/08/2023] Open
Abstract
Simple Summary Neonatal diarrhea is a major cause of economic losses in the swine industry worldwide and has significant impact in Spain, which is one of the biggest pork producers globally. Multiple infectious agents can contribute to this condition, with some viruses such as species A rotavirus (RVA) playing a major role. Studies on their occurrence and genetic diversity are essential for development of RVA vaccines. In this study, fecal samples from diarrheic suckling piglets originating from farms distributed throughout Spain were analyzed for RVA and four other common enteric pathogens using molecular methods. The individual prevalence was 89.4%, 64.4%, 44.9%, 33.7% and 4.4% for Clostridiumperfringens, Clostridioides (formerly Clostridium) difficile, species A rotavirus, species C rotavirus and porcine epidemic diarrhea virus, respectively. Most specimens (96.9%) were positive for at least one of the target pathogens and concurrent infections were common. The molecular characterization of RVA positive specimens of specific genes used for genotyping revealed the extensive genetic diversity of RVA strains circulating in swine herds in Spain. Comparison with genotypes contained in the commercial vaccine available in Spain showed differences in the identity of the predominant RVA genotypes from diarrheic piglets in the sampled pig farms. These findings contribute to the surveillance of RVA strains circulating in swine herds in Spain and may help optimize target vaccine design. Abstract Species A rotavirus (RVA) is a major viral pathogen causing diarrhea in suckling piglets. Studies on its genetic heterogeneity have implications for vaccine efficacy in the field. In this study, fecal samples (n = 866) from diarrheic piglets younger than 28 days were analyzed over a two-year period (2018–2019). Samples were submitted from 426 farms located in 36 provinces throughout Spain and were tested using real-time PCR (qPCR) and reverse transcription real-time PCR (RT-qPCR) for five enteric pathogens. The individual prevalence was 89.4%, 64.4%, 44.9%, 33.7% and 4.4% for Clostridiumperfringens, Clostridioides (formerly Clostridium) difficile, species A rotavirus, species C rotavirus and porcine epidemic diarrhea virus, respectively. Most specimens (96.9%) were positive for at least one of the target pathogens, and more than 80% of samples harbored mixed infections. Nucleotide sequencing of 70 specimens positive for RVA revealed the presence of the VP7 genotypes G4, G9, G3, G5, G11 and the VP4 genotypes P7, P23, P6 and P13, with the combinations G4P7 and G9P23 being the most prevalent, and especially in the areas with the highest pig population. The study shows the extensive genetic diversity of RVA strains as well as discrepancies with the genotypes contained in the vaccine available in Spain, and multiple amino acid differences in antigenic epitopes of different G- and P- genotypes with the vaccine strains. Further investigations are needed to determine the efficacy of the vaccine to confer clinical protection against heterologous strains.
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Affiliation(s)
- Luis V. Monteagudo
- Department of Anatomy, Embryology and Genetics, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain;
- Agrifood Institute of Aragón (IA2), University of Zaragoza-CITA, 50013 Zaragoza, Spain
| | - Alfredo A. Benito
- EXOPOL S.L, Pol Rio Gállego D/14, San Mateo del Gállego, 50840 Zaragoza, Spain; (A.A.B.); (S.L.-G.); (J.L.A.); (D.M.-J.)
| | - Sofía Lázaro-Gaspar
- EXOPOL S.L, Pol Rio Gállego D/14, San Mateo del Gállego, 50840 Zaragoza, Spain; (A.A.B.); (S.L.-G.); (J.L.A.); (D.M.-J.)
| | - José L. Arnal
- EXOPOL S.L, Pol Rio Gállego D/14, San Mateo del Gállego, 50840 Zaragoza, Spain; (A.A.B.); (S.L.-G.); (J.L.A.); (D.M.-J.)
| | - Desirée Martin-Jurado
- EXOPOL S.L, Pol Rio Gállego D/14, San Mateo del Gállego, 50840 Zaragoza, Spain; (A.A.B.); (S.L.-G.); (J.L.A.); (D.M.-J.)
| | - Rut Menjon
- MSD Animal Health España, Carbajosa de la Sagrada, 37188 Salamanca, Spain;
| | - Joaquín Quílez
- Agrifood Institute of Aragón (IA2), University of Zaragoza-CITA, 50013 Zaragoza, Spain
- Department of Animal Pathology, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain
- Correspondence: ; Tel.: +34-976-762150
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13
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Novel Neutralizing Epitope of PEDV S1 Protein Identified by IgM Monoclonal Antibody. Viruses 2022; 14:v14010125. [PMID: 35062329 PMCID: PMC8778753 DOI: 10.3390/v14010125] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 12/29/2021] [Accepted: 01/07/2022] [Indexed: 12/11/2022] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) causes devastating enteric disease that inflicts huge economic damage on the swine industry worldwide. A safe and highly effective PEDV vaccine that contains only the virus-neutralizing epitopes (not enhancing epitope), as well as a ready-to-use PEDV neutralizing antibody for the passive immunization of PEDV vulnerable piglets (during the first week of life) are needed, particularly for PEDV-endemic farms. In this study, we generated monoclonal antibodies (mAbs) to the recombinant S1 domain of PEDV spike (S) protein and tested their PEDV neutralizing activity by CPE-reduction assay. The mAb secreted by one hybrodoma clone (A3), that also bound to the native S1 counterpart from PEDV-infected cells (tested by combined co-immunoprecipitation and Western blotting), neutralized PEDV infectivity. Epitope of the neutralizing mAb (mAbA3) locates in the S1A subdomain of the spike protein, as identified by phage mimotope search and multiple sequence alignment, and peptide binding-ELISA. The newly identified epitope is shared by PEDV G1 and G2 strains and other alphacoronaviruses. In summary, mAbA3 may be useful as a ready-to-use antibody for passive immunization of PEDV-susceptible piglets, while the novel neutralizing epitope, together with other, previously known protective epitopes, have potential as an immunogenic cocktail for a safe, next-generation PEDV vaccine.
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14
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Kong F, Wang Q, Kenney SP, Jung K, Vlasova AN, Saif LJ. Porcine Deltacoronaviruses: Origin, Evolution, Cross-Species Transmission and Zoonotic Potential. Pathogens 2022; 11:79. [PMID: 35056027 PMCID: PMC8778258 DOI: 10.3390/pathogens11010079] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 12/30/2021] [Accepted: 01/04/2022] [Indexed: 01/27/2023] Open
Abstract
Porcine deltacoronavirus (PDCoV) is an emerging enteropathogenic coronavirus of swine that causes acute diarrhoea, vomiting, dehydration and mortality in seronegative neonatal piglets. PDCoV was first reported in Hong Kong in 2012 and its etiological features were first characterized in the United States in 2014. Currently, PDCoV is a concern due to its broad host range, including humans. Chickens, turkey poults, and gnotobiotic calves can be experimentally infected by PDCoV. Therefore, as discussed in this review, a comprehensive understanding of the origin, evolution, cross-species transmission and zoonotic potential of epidemic PDCoV strains is urgently needed.
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Affiliation(s)
- Fanzhi Kong
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, No. 5 Xinfeng Road, Sartu District, Daqing 163319, China;
| | - Qiuhong Wang
- Center for Food Animal Health, Department of Animal Sciences, College of Food, Agricultural and Environmental Sciences, The Ohio State University, Wooster, OH 44691, USA; (S.P.K.); (K.J.); (A.N.V.); (L.J.S.)
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Scott P. Kenney
- Center for Food Animal Health, Department of Animal Sciences, College of Food, Agricultural and Environmental Sciences, The Ohio State University, Wooster, OH 44691, USA; (S.P.K.); (K.J.); (A.N.V.); (L.J.S.)
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Kwonil Jung
- Center for Food Animal Health, Department of Animal Sciences, College of Food, Agricultural and Environmental Sciences, The Ohio State University, Wooster, OH 44691, USA; (S.P.K.); (K.J.); (A.N.V.); (L.J.S.)
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Anastasia N. Vlasova
- Center for Food Animal Health, Department of Animal Sciences, College of Food, Agricultural and Environmental Sciences, The Ohio State University, Wooster, OH 44691, USA; (S.P.K.); (K.J.); (A.N.V.); (L.J.S.)
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Linda J. Saif
- Center for Food Animal Health, Department of Animal Sciences, College of Food, Agricultural and Environmental Sciences, The Ohio State University, Wooster, OH 44691, USA; (S.P.K.); (K.J.); (A.N.V.); (L.J.S.)
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA
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15
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Antas M, Olech M, Szczotka-Bochniarz A. Molecular characterization of porcine epidemic diarrhoea virus (PEDV) in Poland reveals the presence of swine enteric coronavirus (SeCoV) sequence in S gene. PLoS One 2021; 16:e0258318. [PMID: 34714840 PMCID: PMC8555794 DOI: 10.1371/journal.pone.0258318] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 09/23/2021] [Indexed: 11/23/2022] Open
Abstract
Porcine epidemic diarrhoea (PED) is a highly contagious enteric viral disease of pigs with a high morbidity and mortality rate, which ultimately results in huge economic losses in the pig production sector. The etiological agent of this disease is the porcine epidemic diarrhoea virus (PEDV) which is an enveloped, positive single-stranded RNA virus. The aim of this study was to perform molecular characterization of PEDV to identify the strains circulating in Poland. In this study, 662 faecal samples from 2015 to 2021 were tested with reverse transcription quantitative real-time PCR (RT-qPCR) and the results showed that 3.8% of the tested samples revealed a positive result for PEDV. A phylogenetic analysis of the complete genome and complete S gene sequences showed that Polish PEDV strains belonged to the G1b (S-INDEL) subgroup and were closely related to the European PEDV strains isolated from 2014 to 2019. Furthermore, RDP4 analysis revealed that the Polish PEDV strains harboured a recombinant fragment of ~400 nt in the 5' end of S gene with PEDV and swine enteric coronavirus (SeCoV) being the major and minor parents, respectively. Antigenic analysis showed that the aa sequences of neutralizing epitopes were conserved among the Polish PEDV strains. Only one strain, #0100/5P, had a unique substitution in the COE epitope. However, Polish PEDV strains showed several substitutions, especially in the COE antigen, as compared to the classical strain CV777. To the best of our knowledge, this is the first report concerning the molecular characterization of porcine epidemic diarrhoea virus strains, as well as the first phylogenetic analysis for PEDV in Poland.
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Affiliation(s)
- Marta Antas
- Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland
| | - Monika Olech
- Department of Biochemistry, National Veterinary Research Institute, Puławy, Poland
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