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Gerber PF, Cao D, Xiao CT, Chen Q, Lager K, Bosch BJ, Meng XJ, Halbur PG, Opriessnig T. Failure to experimentally infect 10 days-old piglets with a cell culture-propagated infectious stock of a classical genotype 1a porcine epidemic diarrhea virus. Front Vet Sci 2023; 10:1279162. [PMID: 38046573 PMCID: PMC10693406 DOI: 10.3389/fvets.2023.1279162] [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: 08/17/2023] [Accepted: 10/20/2023] [Indexed: 12/05/2023] Open
Abstract
Introduction Porcine epidemic diarrhea virus (PEDV) causes enteric disease in pigs of all ages. PEDV can be grouped into G1 (classical strains) and G2 (variant strains) based on sequence differences in the spike gene. Although several pathogenesis studies using contemporary strains of PEDV have been conducted to date, there is limited information on the pathogenesis of historical PEDV strains in contemporary pigs. This study aimed to investigate the clinical disease course of 10 days-old pigs infected with a classical European G1a PEDV strain from the 1980s which was last passaged in pigs in 1994. Methods Sequencing results confirmed that the virus inoculum was a PEDV strain closely related to the prototype CV777 strain. The PEDV stock was serially passaged three times in Vero cells, and the P3 infectious virus stock was used to inoculate the pigs. A total of 40 pigs were inoculated using the oral route. Results Pigs showed no enteric disease signs, and PEDV shedding was not detected for 44 days post-inoculation (dpi). At necropsy at 3 (5 pigs) or 7 dpi (5 pigs), no lesions were observed in intestinal sections, which were negative for PEDV antigen by immunohistochemistry. In addition, no IgG or IgA PEDV-specific antibodies in serum or fecal samples for 35 dpi further indicates a lack of infection. Titration of the leftover thawed and refrozen PEDV virus stock inoculum showed that the virus stock retained its infectivity in Vero cell culture and the porcine small intestine enterocytes cell line IPEC-J2. Discussion The reasons for the loss of infectivity in pigs are unknown. In conclusion, we showed that a classical G1a PEDV strain successfully propagated in cell cultures could not orally infect 40 piglets.
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Affiliation(s)
- Priscilla F. Gerber
- Department of Infectious Diseases and Public Health, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Dianjun Cao
- College of Veterinary Medicine, Long Island University, New York, NY, United States
| | - Chao-Ting Xiao
- Hunan Provincial Key Laboratory of Medical Virology, Institute of Pathogen Biology and Immunology, College of Biology, Hunan University, Changsha, China
| | - Qi Chen
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Kelly Lager
- National Animal Disease Center, United States Department of Agriculture-Agricultural Research Services, Ames, IA, United States
| | - Berend Jan Bosch
- Virology Section, Infectious Diseases and Immunology Division, Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands
| | - Xiang-Jin Meng
- Department of Biomedical Sciences and Pathobiology, College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Patrick G. Halbur
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Tanja Opriessnig
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
- Vaccines and Diagnostics Department, Moredun Research Institute, Penicuik, United Kingdom
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Jang G, Lee D, Shin S, Lim J, Won H, Eo Y, Kim CH, Lee C. Porcine epidemic diarrhea virus: an update overview of virus epidemiology, vaccines, and control strategies in South Korea. J Vet Sci 2023; 24:e58. [PMID: 37532301 PMCID: PMC10404706 DOI: 10.4142/jvs.23090] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/30/2023] [Accepted: 06/04/2023] [Indexed: 08/04/2023] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) has posed significant financial threats to the domestic pig industry over the last three decades in South Korea. PEDV infection will mostly result in endemic persistence in the affected farrow-to-finish (FTF) herds, leading to endemic porcine epidemic diarrhea (PED) followed by year-round recurrent outbreaks. This review aims to encourage collaboration among swine producers, veterinarians, and researchers to offer answers that strengthen our understanding of PEDV in efforts to prevent and control endemic PED and to prepare for the next epidemics or pandemics. We found that collaboratively implementing a PED risk assessment and customized four-pillar-based control measures is vital to interrupt the chain of endemic PED in affected herds: the former can identify on-farm risk factors while the latter aims to compensate for or improve weaknesses via herd immunity stabilization and virus elimination. Under endemic PED, long-term virus survival in slurry and asymptomatically infected gilts ("Trojan Pigs") that can transmit the virus to farrowing houses are key challenges for PEDV eradication in FTF farms and highlight the necessity for active monitoring and surveillance of the virus in herds and their environments. This paper underlines the current knowledge of molecular epidemiology and commercially available vaccines, as well as the risk assessment and customized strategies to control PEDV. The intervention measures for stabilizing herd immunity and eliminating virus circulation may be the cornerstone of establishing regional or national PED eradication programs.
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Affiliation(s)
- Guehwan Jang
- College of Veterinary Medicine and Virus Vaccine Research Center, Gyeongsang National University, Jinju 52828, Korea
| | - Duri Lee
- College of Veterinary Medicine and Virus Vaccine Research Center, Gyeongsang National University, Jinju 52828, Korea
| | - Sangjune Shin
- College of Veterinary Medicine and Virus Vaccine Research Center, Gyeongsang National University, Jinju 52828, Korea
- ChoongAng Vaccine Laboratories, Daejeon 34055, Korea
| | - Jeonggyo Lim
- ChoongAng Vaccine Laboratories, Daejeon 34055, Korea
| | - Hokeun Won
- ChoongAng Vaccine Laboratories, Daejeon 34055, Korea
| | - Youngjoon Eo
- College of Veterinary Medicine and Virus Vaccine Research Center, Gyeongsang National University, Jinju 52828, Korea
- Nawoo Veterinary Group, Yangsan 50573, Korea
| | - Cheol-Ho Kim
- Gyeongnam Veterinary Service Laboratory Quarantine Agency, Jinju 52733, Korea
| | - Changhee Lee
- College of Veterinary Medicine and Virus Vaccine Research Center, Gyeongsang National University, Jinju 52828, Korea.
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Lazov CM, Lohse L, Belsham GJ, Rasmussen TB, Bøtner A. Experimental Infection of Pigs with Recent European Porcine Epidemic Diarrhea Viruses. Viruses 2022; 14:v14122751. [PMID: 36560755 PMCID: PMC9780976 DOI: 10.3390/v14122751] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
Porcine epidemic diarrhea virus (PEDV), belonging to the genus Alphacoronavirus, can cause serious disease in pigs of all ages, especially in suckling pigs. Differences in virulence have been observed between various strains of this virus. In this study, four pigs were inoculated with PEDV from Germany (intestine/intestinal content collected from pigs in 2016) and four pigs with PEDV from Italy (intestine/intestinal material collected from pigs in 2016). The pigs were re-inoculated with the same virus on multiple occasions to create a more robust infection and enhance the antibody responses. The clinical signs and pathological changes observed were generally mild. Two distinct peaks of virus excretion were seen in the group of pigs inoculated with the PEDV from Germany, while only one strong peak was seen for the group of pigs that received the virus from Italy. Seroconversion was seen by days 18 and 10 post-inoculation with PEDV in all surviving pigs from the groups that received the inoculums from Germany and Italy, respectively. Attempts to infect pigs with a swine enteric coronavirus (SeCoV) from Slovakia were unsuccessful, and no signs of infection were observed in the inoculated animals.
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Affiliation(s)
- Christina M. Lazov
- National Veterinary Institute, Technical University of Denmark, 4771 Kalvehave, Denmark
- Section of Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg, Denmark
| | - Louise Lohse
- National Veterinary Institute, Technical University of Denmark, 4771 Kalvehave, Denmark
- Section for Veterinary Virology, Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, 2300 Copenhagen, Denmark
| | - Graham J. Belsham
- National Veterinary Institute, Technical University of Denmark, 4771 Kalvehave, Denmark
- Section of Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg, Denmark
| | - Thomas Bruun Rasmussen
- National Veterinary Institute, Technical University of Denmark, 4771 Kalvehave, Denmark
- Section for Veterinary Virology, Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, 2300 Copenhagen, Denmark
| | - Anette Bøtner
- National Veterinary Institute, Technical University of Denmark, 4771 Kalvehave, Denmark
- Section of Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg, Denmark
- Correspondence:
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Suda Y, Miyazaki A, Miyazawa K, Shibahara T, Ohashi S. Systemic and intestinal porcine epidemic diarrhea virus-specific antibody response and distribution of antibody-secreting cells in experimentally infected conventional pigs. Vet Res 2021; 52:2. [PMID: 33397461 PMCID: PMC7780908 DOI: 10.1186/s13567-020-00880-z] [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: 08/04/2020] [Accepted: 12/15/2020] [Indexed: 01/03/2023] Open
Abstract
Porcine epidemic diarrhea (PED) is a coronavirus disease characterized by the rapid spread of severe diarrhea among pigs. PED virus (PEDV) infects and replicates mainly in the epithelial cells of the duodenum, jejunum, ileum and colon. Serum or mucosal IgA antibody levels have been used to predict both vaccine efficacy and the level of protective immunity to enteric infectious diseases in individuals or herds. Details of the B-cell immune response upon PEDV infection, such as the systemic and mucosal PEDV IgA antibody response, the distribution of IgA antibody-secreting cells (ASCs), and their role in virus clearance are not yet clear. In this experimental infection study, we observed similar fluctuations in PEDV IgA antibody levels in serum and intestinal contents of the upper and lower jejunum and ileum, but not fecal samples, over the 4-week experimental course. ASCs that actively secrete PEDV IgA antibody without in vitro stimulation were distributed mainly in the upper jejunum, whereas memory B cells that showed enhanced PEDV IgA antibody production upon in vitro stimulation were observed in mesenteric lymph nodes and the ileum. Our findings will contribute to the development of effective vaccines and diagnostic methods for PEDV.
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Affiliation(s)
- Yuto Suda
- Kyushu Research Station, National Institute of Animal Health (NIAH), National Agriculture and Food Research Organization (NARO), 2702 Chuzan, Kagoshima, Kagoshima, 891-0105, Japan. .,Division of Viral Disease and Epidemiology, NIAH, NARO, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan.
| | - Ayako Miyazaki
- Division of Viral Disease and Epidemiology, NIAH, NARO, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan
| | - Kohtaro Miyazawa
- Division of Viral Disease and Epidemiology, NIAH, NARO, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan
| | - Tomoyuki Shibahara
- Division of Pathology and Pathophysiology, NIAH, NARO, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan.,Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano, Osaka, 598-8531, Japan
| | - Seiichi Ohashi
- Division of Viral Disease and Epidemiology, NIAH, NARO, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan
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Jung K, Saif LJ, Wang Q. Porcine epidemic diarrhea virus (PEDV): An update on etiology, transmission, pathogenesis, and prevention and control. Virus Res 2020; 286:198045. [PMID: 32502552 PMCID: PMC7266596 DOI: 10.1016/j.virusres.2020.198045] [Citation(s) in RCA: 184] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 05/29/2020] [Accepted: 06/01/2020] [Indexed: 12/13/2022]
Abstract
Porcine epidemic diarrhea virus (PEDV), a member of the genus Alphacoronavirus in the family Coronaviridae, causes acute diarrhea and/or vomiting, dehydration and high mortality in neonatal piglets. Two different genogroups of PEDV, S INDEL [PEDV variant containing multiple deletions and insertions in the S1 subunit of the spike (S) protein, G1b] and non-S INDEL (G2b) strains were detected during the diarrheal disease outbreak in US swine in 2013-2014. Similar viruses are also circulating globally. Continuous improvement and update of biosecurity and vaccine strains and protocols are still needed to control and prevent PEDV infections worldwide. Although the non-S INDEL PEDV was highly virulent and the S INDEL PEDV caused milder disease, the latter has the capacity to cause illness in a high number of piglets on farms with low biosecurity and herd immunity. The main PEDV transmission route is fecal-oral, but airborne transmission via the fecal-nasal route may play a role in pig-to-pig and farm-to-farm spread. PEDV infection of neonatal pigs causes fecal virus shedding (alongside frequent detection of PEDV RNA in the nasal cavity), acute viremia, severe atrophic enteritis (mainly jejunum and ileum), and increased pro-inflammatory and innate immune responses. PEDV-specific IgA effector and memory B cells in orally primed sows play a critical role in sow lactogenic immunity and passive protection of piglets. This review focuses on the etiology, transmission, pathogenesis, and prevention and control of PEDV infection.
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Affiliation(s)
- Kwonil Jung
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, USA.
| | - Linda J Saif
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, USA.
| | - Qiuhong Wang
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, USA.
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Malik YS, Singh RK, Yadav MP, Langel SN, Malik YS, Saif LJ. Porcine Coronaviruses. EMERGING AND TRANSBOUNDARY ANIMAL VIRUSES 2020. [PMCID: PMC7123000 DOI: 10.1007/978-981-15-0402-0_4] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Transmissible gastroenteritis virus (TGEV), porcine epidemic diarrhoea virus (PEDV), and porcine deltacoronavirus (PDCoV) are enteropathogenic coronaviruses (CoVs) of swine. TGEV appearance in 1946 preceded identification of PEDV (1971) and PDCoV (2009) that are considered as emerging CoVs. A spike deletion mutant of TGEV associated with respiratory tract infection in piglets appeared in 1984 in pigs in Belgium and was designated porcine respiratory coronavirus (PRCV). PRCV is considered non-pathogenic because the infection is very mild or subclinical. Since PRCV emergence and rapid spread, most pigs have become immune to both PRCV and TGEV, which has significantly reduced the clinical and economic importance of TGEV. In contrast, PDCoV and PEDV are currently expanding their geographic distribution, and there are reports on the circulation of TGEV-PEDV recombinants that cause a disease clinically indistinguishable from that associated with the parent viruses. TGEV, PEDV and PDCoV cause acute gastroenteritis in pigs (most severe in neonatal piglets) and matches in their clinical signs and pathogenesis. Necrosis of the infected intestinal epithelial cells causes villous atrophy and malabsorptive diarrhoea. Profuse diarrhoea frequently combined with vomiting results in dehydration, which can lead to the death of piglets. Strong immune responses following natural infection protect against subsequent homologous challenge; however, these viruses display no cross-protection. Adoption of advance biosecurity measures and effective vaccines control and prevent the occurrence of diseases due to these porcine-associated CoVs. Recombination and reversion to virulence are the risks associated with generally highly effective attenuated vaccines necessitating further research on alternative vaccines to ensure their safe application in the field.
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Affiliation(s)
- Yashpal Singh Malik
- grid.417990.20000 0000 9070 5290Biological Standardization, Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh India
| | - Raj Kumar Singh
- grid.417990.20000 0000 9070 5290ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh India
| | - Mahendra Pal Yadav
- grid.444573.5ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India, Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut, Uttar Pradesh India
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Liu X, Zhang L, Zhang Q, Zhou P, Fang Y, Zhao D, Feng J, Li W, Zhang Y, Wang Y. Evaluation and comparison of immunogenicity and cross-protective efficacy of two inactivated cell culture-derived GIIa- and GIIb-genotype porcine epidemic diarrhea virus vaccines in suckling piglets. Vet Microbiol 2019; 230:278-282. [PMID: 30827401 DOI: 10.1016/j.vetmic.2019.02.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/08/2019] [Accepted: 02/11/2019] [Indexed: 12/20/2022]
Abstract
Although highly virulent GII-genotype PEDV strains have become pandemic in the swine population worldwide, little is known about the differences in immunogenicity and cross-protective efficacy between the GIIa and GIIb subgenotypes. Hence, in the present study, we vaccinated suckling piglets with GIIa (CH/HBXT/2018) and GIIb (CH/HNPJ/2017) PEDV strain-based inactivated vaccine candidates and compared their immunogenicity and cross-protective efficacy. The results showed that both vaccine candidates induced high levels of PEDV-specific IgG antibodies and IFN-γ and reduced the levels of neutralizing antibodies at 21 dpv in suckling piglets. The GIIa-based inactivated vaccine protected all piglets (8/8) against virulent homologous and heterologous virus challenge, while the GIIb strain-based inactivated vaccine protected only 2/4 and 1/4 piglets against virulent homologous and heterologous virus challenge, respectively. Furthermore, antibodies against the GIIa and GIIb strains cross-reacted and cross-neutralized both strains in vitro. Taken together, the data presented in this study indicate that GIIa strain-based inactivated vaccine candidates are more promising than GIIb-based candidates for the development of an effective vaccine against the current highly virulent pandemic PEDV strains.
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Affiliation(s)
- Xinsheng Liu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Liping Zhang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Qiaoling Zhang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Peng Zhou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Yuzhen Fang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Donghong Zhao
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Jiaxin Feng
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Weiyan Li
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Yongguang Zhang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
| | - Yonglu Wang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China.
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Sozzi E, Moreno A, Lelli D, Perulli S, Prosperi A, Brocchi E, Capucci L, Papetti A, Giacomini E, Alborali GL, Lavazza A. Development and validation of a monoclonal antibody-based competitive ELISA for detection of antibodies against porcine epidemic diarrhoea virus (PEDV). Res Vet Sci 2018; 121:106-110. [PMID: 30384140 PMCID: PMC7111896 DOI: 10.1016/j.rvsc.2018.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 10/18/2018] [Accepted: 10/21/2018] [Indexed: 02/06/2023]
Abstract
Porcine epidemic diarrhoea virus (PEDV), belongs to the genus Alphacoronavirus in the family Coronaviridae and causes severe diarrhoea, vomiting, dehydration and high mortality in seronegative newborn piglets. Thus, a precise and rapid diagnosis of PEDV infection is important for the application of control measures to limit viral dissemination. In this investigation, a monoclonal antibodies (MAbs)-based competitive enzyme-linked immunosorbent assay (ELISA) for detecting antibodies against PEDV was developed and validated. The diagnostic performance of the test was evaluated by receiver operating characteristic (ROC) analysis using a panel of 829 known sera collected from different commercial pig farms, with or without a history of PED presence and from experimentally infected pigs. The competitive ELISA showed excellent diagnostic performance and discriminatory power with high sensitivity (Se) and specificity (Sp) values (Se = 96.5%, 95% IC 94.1-98.1; Sp = 98.2%, 95% IC 96.3-99.3). Moreover, this competitive ELISA method has other properties, such as high feasibility of testing sera without pre-treatment and automatic and instrument-mediated revealing, that makes it appropriate for large-scale screenings of affected pig farms in endemic regions or for monitoring plans in PEDV-free areas.
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Affiliation(s)
- Enrica Sozzi
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy.
| | - Ana Moreno
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Davide Lelli
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Simona Perulli
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Alice Prosperi
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Emiliana Brocchi
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Lorenzo Capucci
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Alice Papetti
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Enrico Giacomini
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Giovanni Loris Alborali
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
| | - Antonio Lavazza
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna "Bruno Ubertini", Via Bianchi, 9, 25124 Brescia, Italy
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Gallien S, Andraud M, Moro A, Lediguerher G, Morin N, Gauger PC, Bigault L, Paboeuf F, Berri M, Rose N, Grasland B. Better horizontal transmission of a US non-InDel strain compared with a French InDel strain of porcine epidemic diarrhoea virus. Transbound Emerg Dis 2018; 65:1720-1732. [PMID: 29968338 PMCID: PMC7169779 DOI: 10.1111/tbed.12945] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 06/01/2018] [Indexed: 11/27/2022]
Abstract
From the severe porcine epidemic diarrhoea (PED) epidemics that struck in 2013 in the United States of America and other countries of North and South America, two types of porcine epidemic diarrhoea virus (PEDV) were isolated, namely the InDel and the non-InDel strains. They are differentiated by insertions/deletions in the S1 nucleotide sequence of the S gene, and differences in virulence were observed from the clinical cases. In 2014, a PED outbreak occurred in a pig farm in France, from which an InDel strain was isolated. This study aimed at comparing, under experimental conditions, the pathogenicity and the direct and indirect transmissions between a non-InDel strain isolated from a PED-affected piglet in 2014 in the USA and the French InDel strain. All infected pigs showed clinical signs with the non-InDel strain although only the inoculated and direct contact pigs showed clinical signs in the InDel strain group. Although viral RNA was detected in air samples with both strains, the indirect contact pigs remained free from infection with the InDel strain in contrast to the non-InDel group in which airborne transmission occurred in the indirect contact pigs. All infected pigs shed virus in faeces regardless of PEDV strain with 9 of 30 pigs showing intermittent faecal shedding. The transmission rate by direct contact was found to be 2.17-fold higher than the non-InDel strain compared with the InDel. In conclusion, the InDel strain was less pathogenic than the non-InDel strain in our experimental conditions. The transmission route differed between the two strains. Direct contact was the main transmission route for the InDel strain, although the non-InDel strain was transmitted through direct contact and indirectly through the air.
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Affiliation(s)
- Sarah Gallien
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
- ISPINRAUniversité François Rabelais de ToursUMR 1282NouzillyFrance
| | - Mathieu Andraud
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Angélique Moro
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Gérald Lediguerher
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Nadège Morin
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Phillip C. Gauger
- Veterinary Diagnostic & Production Animal MedicineVeterinary Diagnostic LaboratoryIowa State University College of Veterinary MedicineAmesIowa
| | - Lionel Bigault
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Frédéric Paboeuf
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Mustapha Berri
- ISPINRAUniversité François Rabelais de ToursUMR 1282NouzillyFrance
| | - Nicolas Rose
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
| | - Béatrice Grasland
- Laboratoire de PloufraganANSESAgence Nationale de Sécurité SanitairePloufraganFrance
- Université Bretagne LoireRennesFrance
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10
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Gallien S, Moro A, Lediguerher G, Catinot V, Paboeuf F, Bigault L, Gauger PC, Pozzi N, Berri M, Authié E, Rose N, Grasland B. Limited shedding of an S-InDel strain of porcine epidemic diarrhea virus (PEDV) in semen and questions regarding the infectivity of the detected virus. Vet Microbiol 2018; 228:20-25. [PMID: 30593368 PMCID: PMC7117288 DOI: 10.1016/j.vetmic.2018.09.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/26/2018] [Accepted: 09/26/2018] [Indexed: 11/26/2022]
Abstract
The aim of this study was to determine if PEDV can be shed in semen from SPF (specific pathogens free) boars infected by a French «S-InDel» PEDV strain (PEDV/FR/001/2014) and in case of positive semen to determine the infectivity of that semen. Both infected boars had diarrhea after inoculation and shed virus in feces. In addition, PEDV genome was detected by RT-qPCR in the sperm-rich fraction of semen from the two boars infected with the «S-InDel» PEDV strain. The PEDV positive semen («S-non-InDel» and «S-InDel») sampled during a previous trial and in this boar trial were inoculated to six SPF weaned pigs. PEDV could be detected in intestinal tissues such as duodenum, jejunum and jejunum Peyer’s patches by RT-qPCR except for one pig.
PEDV is mainly transmitted by the oro-fecal route although PEDV shedding in semen has already been shown for an S-non-InDel PEDV strain infection. The aim of this study was to determine if PEDV can be shed in semen from SPF (specific pathogens free) boars infected by a French S-InDel PEDV strain (PEDV/FR/001/2014) and in case of positive semen to determine the infectivity of that semen. Both infected boars had diarrhea after inoculation and shed virus in feces. PEDV genome was also detected by RT-qPCR in the sperm-rich fraction of semen (6.94 × 103 and 4.73 × 103 genomic copies/mL) from the two boars infected with the S-InDel PEDV strain but only once at 7DPI. In addition, PEDV RNA in Peyer’s patches and in mesenteric lymph nodes was also present for the two inoculated boars. The PEDV positive semen (S-non-InDel and S-InDel) sampled during a previous trial and in this boar trial were inoculated to six SPF weaned pigs. The inoculated piglets did not seroconvert and did not shed virus throughout the duration of the study except for one pig at 18 DPI. But, PEDV could be detected in intestinal tissues such as duodenum, jejunum and jejunum Peyer’s patches by RT-qPCR except for one pig. Even if PEDV genome has been detected in semen, experimental infection of piglets with positive semen failed to conclude to the infectivity of the detected PEDV.
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Affiliation(s)
- Sarah Gallien
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France; Institut National de Recherche Agronomique (INRA), Université François Rabelais UMR, 1282 37380, Nouzilly, France
| | - Angélique Moro
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France
| | - Gérald Lediguerher
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France
| | - Virginie Catinot
- Laboratoire National de Contrôle des Reproducteurs (LNCR), 94700, Maisons-Alfort, France
| | - Frédéric Paboeuf
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France
| | - Lionel Bigault
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France
| | - Phillip C Gauger
- Iowa State University College of Veterinary Medicine, Veterinary Diagnostic & Production Animal Medicine, Veterinary Diagnostic Laboratory, United States
| | - Nathalie Pozzi
- Laboratoire National de Contrôle des Reproducteurs (LNCR), 94700, Maisons-Alfort, France
| | - Mustapha Berri
- Institut National de Recherche Agronomique (INRA), Université François Rabelais UMR, 1282 37380, Nouzilly, France
| | - Edith Authié
- Laboratoire National de Contrôle des Reproducteurs (LNCR), 94700, Maisons-Alfort, France
| | - Nicolas Rose
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France
| | - Béatrice Grasland
- Anses, Laboratory of Ploufragan/Plouzané, BP53, 22440, Ploufragan, France; Université Bretagne Loire, 35000, Rennes, France.
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11
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Joshi LR, Okda FA, Singrey A, Maggioli MF, Faccin TC, Fernandes MHV, Hain KS, Dee S, Bauermann FV, Nelson EA, Diel DG. Passive immunity to porcine epidemic diarrhea virus following immunization of pregnant gilts with a recombinant orf virus vector expressing the spike protein. Arch Virol 2018; 163:2327-2335. [PMID: 29725899 PMCID: PMC7086649 DOI: 10.1007/s00705-018-3855-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 04/18/2018] [Indexed: 01/08/2023]
Abstract
Passive immunity is critical for protection of neonatal piglets against porcine epidemic diarrhea virus (PEDV). Here, we investigated the immunogenicity of an orf virus (ORFV) vector expressing the full-length spike (S) protein of PEDV (ORFV-PEDV-S) in pregnant gilts and its ability to confer passive immunity and protection in piglets. Three doses of ORFV-PEDV-S were given to two groups of PEDV-negative pregnant gilts, with the last dose being administered two weeks prior to farrowing. One of the two groups immunized with the ORFV-PEDV-S recombinant virus was also exposed to live PEDV orally on day 31 post-immunization (pi). Antibody responses were assessed in serum, colostrum and milk of immunized gilts, and passive transfer of antibodies was evaluated in piglet sera. The protective efficacy of ORFV-PEDV-S was evaluated after challenge of the piglets with PEDV. PEDV-specific IgG, IgA and neutralizing antibody (NA) responses were detected in ORFV-PEDV-S-immunized and ORFV-PEDV-S-immunized/PEDV-exposed gilts. PEDV NA, IgG and IgA were detected in the serum of piglets born to immunized gilts, demonstrating the transfer of antibodies through colostrum and milk. Piglets born to immunized gilts showed reduced morbidity and a marked reduction in mortality after PEDV challenge in comparison to control piglets. Piglets born to gilts that received ORFV-PEDV-S and were exposed to live PEDV showed stronger NA responses and lower clinical scores when compared to piglets born to gilts immunized with ORFV-PEDV-S alone. These results demonstrate the potential of ORFV as a vaccine delivery platform capable of eliciting passive immunity against PEDV.
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Affiliation(s)
- Lok R Joshi
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Faten A Okda
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA
| | - Aaron Singrey
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Mayara F Maggioli
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Tatiane C Faccin
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Maureen H V Fernandes
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Kyle S Hain
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA
| | - Scott Dee
- Pipestone Veterinary Services, Pipestone Applied Research, Pipestone, MN, 51164, USA
| | - Fernando V Bauermann
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Eric A Nelson
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA.,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA
| | - Diego G Diel
- Department of Veterinary and Biomedical Sciences, Animal Disease Research and Diagnostic Laboratory, 1155 North Campus Drive, Box 2175, Brookings, SD, 57007, USA. .,Center for Biologics Research and Commercialization, South Dakota State University, Brookings, SD, 57007, USA.
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12
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Rasmussen TB, Boniotti MB, Papetti A, Grasland B, Frossard JP, Dastjerdi A, Hulst M, Hanke D, Pohlmann A, Blome S, van der Poel WHM, Steinbach F, Blanchard Y, Lavazza A, Bøtner A, Belsham GJ. Full-length genome sequences of porcine epidemic diarrhoea virus strain CV777; Use of NGS to analyse genomic and sub-genomic RNAs. PLoS One 2018; 13:e0193682. [PMID: 29494671 PMCID: PMC5832266 DOI: 10.1371/journal.pone.0193682] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 02/15/2018] [Indexed: 11/30/2022] Open
Abstract
Porcine epidemic diarrhoea virus, strain CV777, was initially characterized in 1978 as the causative agent of a disease first identified in the UK in 1971. This coronavirus has been widely distributed among laboratories and has been passaged both within pigs and in cell culture. To determine the variability between different stocks of the PEDV strain CV777, sequencing of the full-length genome (ca. 28kb) has been performed in 6 different laboratories, using different protocols. Not surprisingly, each of the different full genome sequences were distinct from each other and from the reference sequence (Accession number AF353511) but they are >99% identical. Unique and shared differences between sequences were identified. The coding region for the surface-exposed spike protein showed the highest proportion of variability including both point mutations and small deletions. The predicted expression of the ORF3 gene product was more dramatically affected in three different variants of this virus through either loss of the initiation codon or gain of a premature termination codon. The genome of one isolate had a substantially rearranged 5´-terminal sequence. This rearrangement was validated through the analysis of sub-genomic mRNAs from infected cells. It is clearly important to know the features of the specific sample of CV777 being used for experimental studies.
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Affiliation(s)
- Thomas Bruun Rasmussen
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - Maria Beatrice Boniotti
- IZSLER, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna “Bruno Ubertini”, Brescia, Italy
| | - Alice Papetti
- IZSLER, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna “Bruno Ubertini”, Brescia, Italy
| | - Béatrice Grasland
- ANSES–Laboratory of Ploufragan-Plouzané –BP 53, Ploufragan, France
- Université Bretagne Loire, Rennes, France
| | - Jean-Pierre Frossard
- Animal and Plant Health Agency, Department of Virology, Weybridge, Addlestone, Surrey, United Kingdom
| | - Akbar Dastjerdi
- Animal and Plant Health Agency, Department of Virology, Weybridge, Addlestone, Surrey, United Kingdom
| | - Marcel Hulst
- Wageningen BioVeterinary Research, Department of Virology, Lelystad, The Netherlands
| | - Dennis Hanke
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald—Insel Riems, Germany
| | - Anne Pohlmann
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald—Insel Riems, Germany
| | - Sandra Blome
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald—Insel Riems, Germany
| | | | - Falko Steinbach
- Animal and Plant Health Agency, Department of Virology, Weybridge, Addlestone, Surrey, United Kingdom
| | - Yannick Blanchard
- ANSES–Laboratory of Ploufragan-Plouzané –BP 53, Ploufragan, France
- Université Bretagne Loire, Rennes, France
| | - Antonio Lavazza
- IZSLER, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna “Bruno Ubertini”, Brescia, Italy
| | - Anette Bøtner
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - Graham J. Belsham
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
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13
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Hu H, Jung K, Wang Q, Saif LJ, Vlasova AN. Development of a one-step RT-PCR assay for detection of pancoronaviruses (α-, β-, γ-, and δ-coronaviruses) using newly designed degenerate primers for porcine and avian `fecal samples. J Virol Methods 2018; 256:116-122. [PMID: 29499225 PMCID: PMC7113874 DOI: 10.1016/j.jviromet.2018.02.021] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 01/18/2018] [Accepted: 02/26/2018] [Indexed: 11/28/2022]
Abstract
Coronaviruses (CoVs) are critical human and animal pathogens because of their potential to cause severe epidemics of respiratory or enteric diseases. In pigs, the newly emerged porcine deltacoronavirus (PDCoV) and re-emerged porcine epidemic diarrhea virus (PEDV) reported in the US and Asia, as well as the discovery of novel CoVs in wild bats or birds, has necessitated development of improved detection and control measures for these CoVs. Because the previous pancoronavirus (panCoV) RT-PCR established in our laboratory in 2007-2011 did not detect deltacoronaviruses (δ-CoVs) in swine fecal and serum samples, our goal was to develop a new panCoV RT-PCR assay to detect known human and animal CoVs, including δ-CoVs. In this study, we designed a new primer set to amplify a 668 bp-region within the RNA-dependent RNA polymerase (RdRP) gene that encodes the most conserved protein domain of α-, β-, γ-, and δ-CoVs. We established a one-step panCoV RT-PCR assay and standardized the assay conditions. The newly established panCoV RT-PCR assay was demonstrated to have a high sensitivity and specificity. Using a panel of 60 swine biological samples (feces, intestinal contents, and sera) characterized by PEDV, PDCoV and transmissible gastroenteritis virus-specific RT-PCR assays, we demonstrated that sensitivity and specificity of the newly established panCoV RT-PCR assay were 100%. 400 avian fecal (RNA) samples were further tested simultaneously for CoV by the new panCoV RT-PCR and a one-step RT-PCR assay with the δ-CoV nucleocapsid-specific universal primers. Four of 400 avian samples were positive for CoV, three of which were positive for δ-CoV by the conventional RT-PCR. PanCoV RT-PCR fragments for 3 of the 4 CoVs were sequenced. Phylogenetic analysis revealed the presence of one γ-CoV and two δ-CoV in the sequenced samples. The newly designed panCoV RT-PCR assay should be useful for the detection of currently known CoVs in animal biological samples.
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Affiliation(s)
- Hui Hu
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, 44691, United States; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450002, China
| | - Kwonil Jung
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, 44691, United States
| | - Qiuhong Wang
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, 44691, United States
| | - Linda J Saif
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, 44691, United States.
| | - Anastasia N Vlasova
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, 44691, United States.
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14
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Jing Z, Zhang X, Shi H, Chen J, Shi D, Dong H, Feng L. A G3P[13] porcine group A rotavirus emerging in China is a reassortant and a natural recombinant in the VP4 gene. Transbound Emerg Dis 2017; 65:e317-e328. [PMID: 29148270 PMCID: PMC7169750 DOI: 10.1111/tbed.12756] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Indexed: 12/22/2022]
Abstract
Group A rotaviruses (RVAs) are a major cause of serious intestinal disease in piglets. In this study, a novel pig strain was identified in a stool sample from China. The strain was designated RVA/Pig/China/LNCY/2016/G3P[13] and had a G3-P[13]-I5-R1-C1-M1-A8-N1-T1-E1-H1 genome. The viral protein 7 (VP7) and non-structural protein 4 (NSP4) genes of RVA/Pig/China/LNCY/2016/G3P[13] were closely related to cogent genes of human RVAs, suggesting that a reassortment between pig and human strains had occurred. Recombination analysis showed that RVA/Pig/China/LNCY/2016/G3P[13] is a natural recombinant strain between the P[23] and P[7] RVA strains, and crossover points for recombination were found at nucleotides (nt) 456 and 804 of the VP4 gene. Elucidating the biological characteristics of porcine rotavirus (PoRV) will be helpful for further analyses of the epidemic characteristics of this virus. The results of this study provide valuable information for RVA recombination and evolution and will facilitate future investigations into the molecular pathogenesis of RVAs.
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Affiliation(s)
- Z Jing
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
| | - X Zhang
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
| | - H Shi
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
| | - J Chen
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
| | - D Shi
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
| | - H Dong
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China.,Molecular Biology (Gembloux Agro-Bio Tech), University of Liège (ULg), Liège, Belgium
| | - L Feng
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, Harbin, China
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15
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Leidenberger S, Schröder C, Zani L, Auste A, Pinette M, Ambagala A, Nikolin V, de Smit H, Beer M, Blome S. Virulence of current German PEDV strains in suckling pigs and investigation of protective effects of maternally derived antibodies. Sci Rep 2017; 7:10825. [PMID: 28883628 PMCID: PMC5589859 DOI: 10.1038/s41598-017-11160-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 08/21/2017] [Indexed: 11/08/2022] Open
Abstract
Porcine epidemic diarrhea (PED) has caused tremendous losses to the United States pig industry since 2013. From 2014, outbreaks were also reported from Central Europe. To characterize the Central European PEDV strains regarding their virulence in suckling piglets, and to assess the protective effect of maternally derived antibodies (MDA), four trial groups were randomly assigned, each consisting of two pregnant sows and their litter. To induce MDA in a subset of piglets, two sows received a cell culture-adapted PEDV strain, and another two sows were inoculated with field material from German PED outbreaks. Four sows stayed naïve. Subsequently, all piglets were inoculated with the corresponding PEDV strains at an age of 3 to 6 days, and virus shedding, clinical signs and occurrence of specific antibodies were assessed. Piglets without MDA showed a morbidity of 100% and low lethality, while almost all MDA-positive piglets stayed clinically healthy and showed considerably lower virus shedding. Taken together, the Central European PEDV strains showed rather low virulence under experimental conditions, and pre-inoculation of sows led to a solid protection of their offspring. The latter is the prerequisite for a sow vaccination concept that could help to prevent PED induced losses in the piglet sector.
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Affiliation(s)
- S Leidenberger
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany
| | - Ch Schröder
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany
| | - L Zani
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany
| | - A Auste
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany
| | - M Pinette
- Canadian Food inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, R3E 3M4, Canada
| | - A Ambagala
- Canadian Food inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, R3E 3M4, Canada
| | - V Nikolin
- Boehringer Ingelheim Veterinary Research Center, Hannover, 30559, Germany
| | - H de Smit
- Boehringer Ingelheim Veterinary Research Center, Hannover, 30559, Germany
| | - M Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany
| | - S Blome
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, 17493, Germany.
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16
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Strandbygaard B, Lavazza A, Lelli D, Blanchard Y, Grasland B, Poder SL, Rose N, Steinbach F, van der Poel WHM, Widén F, Belsham GJ, Bøtner A. Inter-laboratory study to characterize the detection of serum antibodies against porcine epidemic diarrhoea virus. Vet Microbiol 2016; 197:151-160. [PMID: 27938678 PMCID: PMC7117164 DOI: 10.1016/j.vetmic.2016.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/17/2016] [Accepted: 11/20/2016] [Indexed: 10/25/2022]
Abstract
Porcine epidemic diarrhea virus (PEDV) has caused extensive economic losses to pig producers in many countries. It was recently introduced, for the first time, into North America and outbreaks have occurred again in multiple countries within Europe as well. To assess the properties of various diagnostic assays for the detection of PEDV infection, multiple panels of porcine sera have been shared and tested for the presence of antibodies against PEDV in an inter-laboratory ring trial. Different laboratories have used a variety of "in house" ELISAs and also one commercial assay. The sensitivity and specificity of each assay has been estimated using a Bayesian analysis applied to the ring trial results obtained with the different assays in the absence of a gold standard. Although different characteristics were found, it can be concluded that each of the assays used can detect infection of pigs at a herd level by either the early European strains of PEDV or the recently circulating strains (INDEL and non-INDEL). However, not all the assays seem suitable for demonstrating freedom from disease in a country. The results from individual animals, especially when the infection has occurred within an experimental situation, show more variation.
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Affiliation(s)
- Bertel Strandbygaard
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
| | - Antonio Lavazza
- IZSLER - Virology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini" Via Bianchi 7/9, 25124 Brescia, Italy.
| | - Davide Lelli
- IZSLER - Virology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini" Via Bianchi 7/9, 25124 Brescia, Italy.
| | - Yannick Blanchard
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Béatrice Grasland
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Sophie Le Poder
- Université Paris-Est, Ecole Nationale Vétérinaire d'Alfort, UMR 1161 Virology, Maisons-Alfort, France; INRA, UMR 1161 Virology, Maisons-Alfort, France; ANSES - Laboratory of Animal Health of Maisons-Alfort - UMR 1161 Virology, 23 avenue du Général de Gaulle, France.
| | - Nicolas Rose
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Falko Steinbach
- APHA, Dept of Virology, Weybridge, Addlestone, Surrey. KT15 3NB, UK.
| | - Wim H M van der Poel
- Wageningen University and Research Centre, Edelhertweg 15, 8219PH, Lelystad, The Netherlands.
| | - Frederik Widén
- The National Veterinary Institute (SVA), 75189 Uppsala, Sweden.
| | - Graham J Belsham
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
| | - Anette Bøtner
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
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17
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Belsham GJ, Rasmussen TB, Normann P, Vaclavek P, Strandbygaard B, Bøtner A. Characterization of a Novel Chimeric Swine Enteric Coronavirus from Diseased Pigs in Central Eastern Europe in 2016. Transbound Emerg Dis 2016; 63:595-601. [PMID: 27619563 PMCID: PMC7169874 DOI: 10.1111/tbed.12579] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Indexed: 01/03/2023]
Abstract
During a severe outbreak of diarrhoea and vomiting in a pig herd in Central Eastern Europe, faecal samples were tested positive for porcine epidemic diarrhoea virus (PEDV) and negative for transmissible gastroenteritis virus (TGEV) using a commercial RT-qPCR assay that can detect both of these coronaviruses. However, further analyses, using other TGEV- and PEDV-specific RT-qPCR assays, provided results inconsistent with infection by either of these viruses. Sequencing of an amplicon (ca. 1.6 kb), generated by an RT-PCR specific for the PEDV S-gene, indicated a very close similarity (ca. 99% identity) to recently described chimeric viruses termed swine enteric coronaviruses (SeCoVs). These viruses (with an RNA genome of ca. 28 kb) were first identified in Italy in samples from 2009 but have not been detected there since 2012. A closely related virus was detected in archived samples in Germany from 2012, but has not been detected subsequently. Building on the initial sequence data, further amplicons were generated and over 9 kb of sequence corresponding to the 3'-terminus of the new SeCoV genome was determined. Sequence comparisons showed that the three known SeCoVs are ≥98% identical across this region and contain the S-gene and 3a sequences from PEDV within a backbone of TGEV, but the viruses are clearly distinct from each other. It is demonstrated, for the first time, that pigs from within the SeCoV-infected herd seroconverted against PEDV but tested negative in a TGEV-specific ELISA that detects antibodies against the S protein. These results indicate that SeCoV is continuing to circulate in Europe and suggest it can cause a disease that is very similar to PED. Specific detection of the chimeric SeCoVs either requires development of a new diagnostic RT-qPCR assay or the combined use of assays targeting the PEDV S-gene and another part of the TGEV genome.
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Affiliation(s)
- G J Belsham
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - T B Rasmussen
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - P Normann
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - P Vaclavek
- Department of Virology, State Veterinary Institute Jihlava, Jihlava, Czech Republic
| | - B Strandbygaard
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark
| | - A Bøtner
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, Denmark.
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18
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Gerber PF, Lelli D, Zhang J, Strandbygaard B, Moreno A, Lavazza A, Perulli S, Bøtner A, Comtet L, Roche M, Pourquier P, Wang C, Opriessnig T. Diagnostic evaluation of assays for detection of antibodies against porcine epidemic diarrhea virus (PEDV) in pigs exposed to different PEDV strains. Prev Vet Med 2016; 135:87-94. [PMID: 27931933 PMCID: PMC7126628 DOI: 10.1016/j.prevetmed.2016.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 10/31/2016] [Accepted: 11/06/2016] [Indexed: 11/08/2022]
Abstract
Porcine epidemic diarrhea virus (PEDV) has caused economic losses in the Americas, Asia and Europe in recent years. Reliable serological assays are essential for epidemiological studies and vaccine evaluation. The objective of this study was to compare the ability of five enzyme-linked immunosorbent assays (ELISAs) to detect antibodies against different PEDV strains in pig serum. A total of 732 serum samples from North American or European pigs were tested. Samples included experimental samples from pigs infected with classical (G1a PEDV) or variant genogroup 1 PEDV (G1b PEDV), pandemic genogroup 2 PEDV (G2b PEDV) or non-infected controls. Field samples from herds with confirmed or unknown PEDV exposure were also used. Three indirect ELISAs based on G2b antigens (ELISAs 1, 2 and 3), a competitive ELISA based on the G2b antigen (ELISA 4) and a competitive ELISA based on the G1a antigen (ELISA 5) were compared. Overall, the tests had a moderate agreement (κ = 0.61). G1a PEDV infected pigs were earliest detected by ELISA 3, G1b PEDV infected pigs were earliest detected by ELISAs 4 and 5 and the performance of all tests was similar for the G2b PEDV group. ELISA 1 showed the overall lowest detection on experimentally and field derived samples. Diagnostic sensitivity and specificity with a 95% probability interval were estimated to be 68.2% (62.1–74.4%) and 97.5% (95.2–99.0%) for ELISA 1, 73.7% (71.5–79.6%) and 98.4% (96.6–99.5%) for ELISA 2, 86.2% (81.1–90.6%) and 91.6% (87.7–94.8%) for ELISA 3, 78.3% (72.8–83.5%) and 99.7% (98.2–100%) for ELISA 4, and 93.5% (90.3–96.0%) and 91.2% (83.8–97.9%) for ELISA 5. Differences in detection among assays seem to be more related to intrinsic factors of an assay than to the PEDV antigen used.
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Affiliation(s)
- Priscilla F Gerber
- The Roslin Institute and The Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, United Kingdom
| | - Davide Lelli
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini", Brescia, Italy
| | - Jianqiang Zhang
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | | | - Ana Moreno
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini", Brescia, Italy
| | - Antonio Lavazza
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini", Brescia, Italy
| | - Simona Perulli
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini", Brescia, Italy
| | - Anette Bøtner
- DTU National Veterinary Institute, Kalvehave, Denmark
| | - Loic Comtet
- Innovative Diagnostics IDvet, Grabels, France
| | | | | | - Chong Wang
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | - Tanja Opriessnig
- The Roslin Institute and The Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, United Kingdom; Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA.
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