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El-Tholoth M, Bau HH. Molecular Detection of Respiratory Tract Viruses in Chickens at the Point of Need by Loop-Mediated Isothermal Amplification (LAMP). Viruses 2024; 16:1248. [PMID: 39205222 PMCID: PMC11359210 DOI: 10.3390/v16081248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Revised: 07/27/2024] [Accepted: 08/02/2024] [Indexed: 09/04/2024] Open
Abstract
Accurate and timely molecular diagnosis of respiratory diseases in chickens is essential for implementing effective control measures, preventing the spread of diseases within poultry flocks, minimizing economic loss, and guarding food security. Traditional molecular diagnostic methods like polymerase chain reaction (PCR) require expensive equipment and trained personnel, limiting their use to centralized labs with a significant delay between sample collection and results. Loop-mediated isothermal amplification (LAMP) of nucleic acids offers an attractive alternative for detecting respiratory viruses in broiler chickens with sensitivity comparable to that of PCR. LAMP's main advantages over PCR are its constant incubation temperature (∼65 °C), high amplification efficiency, and contaminant tolerance, which reduce equipment complexity, cost, and power consumption and enable instrument-free tests. This review highlights effective LAMP methods and variants that have been developed for detecting respiratory viruses in chickens at the point of need.
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Affiliation(s)
- Mohamed El-Tholoth
- Department of Virology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
- Veterinary Sciences Program, Health Sciences Division, Al Ain Men’s Campus, Higher Colleges of Technology, Al Ain 17155, United Arab Emirates
| | - Haim H. Bau
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA;
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Goraichuk IV, Torchetti MK, Killian ML, Kapczynski DR, Sary K, Kulkarni A, Suarez DL. Introduction of Avian metapneumovirus subtype A to the United States: molecular insights and implications. Front Microbiol 2024; 15:1428248. [PMID: 39035438 PMCID: PMC11258015 DOI: 10.3389/fmicb.2024.1428248] [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: 05/06/2024] [Accepted: 06/12/2024] [Indexed: 07/23/2024] Open
Abstract
Avian metapneumovirus (aMPV) poses a significant threat to the poultry industry worldwide, primarily affecting turkeys and chickens. The recent detection of aMPV-A and -B subtypes in the United States marks a significant shift after a prolonged period free of aMPV following the eradication of the previously circulating subtype C. Hence, the demand for molecular diagnostic tests for aMPV has arisen due to their limited availability in the US market. In this study, we present the molecular characterization based on the complete genome sequence of aMPV subtype A, which was detected in the US for the first time. Four RT-qPCR positive samples were subjected to next-generation sequencing analysis, resulting in the assembly of one complete and one near-complete genome sequences. Phylogenetic analysis revealed that the isolated strains clustered within the aMPV-A subtype and were most closely related to recent Mexican strains. A detailed amino acid analysis identified unique mutations in the G gene of the US isolates compared to Mexican strains. Additionally, we compared the performance, cross-reactivity, and limit of detection of our revised aMPV subtype-specific RT-qPCR test with two commercial kits, demonstrating similar detection and subtyping capabilities. These findings highlight the importance of accurate diagnostic methods for disease management in the poultry industry, provide valuable insights into the epidemiology of aMPV, and underscore the need for continued vigilance and surveillance to mitigate its impact on poultry production.
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Affiliation(s)
- Iryna V. Goraichuk
- Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA, United States
| | - Mia K. Torchetti
- National Veterinary Services Laboratories, Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Ames, IA, United States
| | - Mary L. Killian
- National Veterinary Services Laboratories, Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Ames, IA, United States
| | - Darrell R. Kapczynski
- Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA, United States
| | - Kathleen Sary
- Georgia Poultry Laboratory Network, Gainesville, GA, United States
| | - Arun Kulkarni
- Georgia Poultry Laboratory Network, Gainesville, GA, United States
| | - David L. Suarez
- Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA, United States
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Graziosi G, Lupini C, Catelli E. Disentangling the role of wild birds in avian metapneumovirus (aMPV) epidemiology: A systematic review and meta-analysis. Transbound Emerg Dis 2022; 69:3285-3299. [PMID: 35960706 PMCID: PMC10086952 DOI: 10.1111/tbed.14680] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 06/21/2022] [Accepted: 08/05/2022] [Indexed: 02/07/2023]
Abstract
Given the avian metapneumovirus (aMPV) disease burden in poultry worldwide and the evidence of a possible role played by wild birds in the virus epidemiology, the present study summarizes aMPV serological and molecular data on free-ranging avifauna available in the literature by conducting a systematic review and meta-analysis. A computerized literature research was performed on PubMed, Scopus, CAB Direct and Web of Science to identify relevant publications across the period 1990-2021, along with the screening of reference lists. A random-effect model was applied to calculate pooled prevalence estimates with 95% confidence intervals. The inconsistency index statistic (I2 ) was applied to assess between-study heterogeneity. Subgroup analyses for molecular studies only were performed according to geographical area of samplings, taxonomic order, genus and migration patterns of the birds surveyed. A total of 11 publications on molecular surveys and 6 on serological ones were retained for analysis. The pooled molecular prevalence was 6% (95% CI: 1-13%) and a high between-study heterogeneity was detected (I2 = 96%, p < .01). Moderator analyses showed statistically significant differences according to geographical area studied, taxonomic order and genus. Concerning serological prevalence, a pooled estimate of 14% (95% CI: 1-39%), along with a high between-study heterogeneity, was obtained (I2 = 98%, p < .01). Moderator analysis was not performed due to the scarcity of eligible serological studies included. Overall, molecular and serological evidence suggests that some wild bird taxa could play a role in aMPV epidemiology. Particularly, wild ducks, geese, gulls and pheasants, according to scientific contributions hereby considered, proved to be susceptible to aMPV, and due to host ecology, may act as a viral carrier or reservoir. Further surveys of wild birds are encouraged for a better comprehension of the poultry/wild bird interface in aMPV epidemiology and for better characterizing the virus host breadth.
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Affiliation(s)
- Giulia Graziosi
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, BO, Italy
| | - Caterina Lupini
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, BO, Italy
| | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, BO, Italy
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Wang J, Hou L, Wei L, Yan X, Zhu S, Quan R, Li Z, Wang D, Jiang H, Song J, Cui Y, Liu J. Characterization of avain metapneumovirus subgroup C isolated from chickens in Beijing, China. Poult Sci 2022; 102:102250. [PMID: 36435163 PMCID: PMC9700036 DOI: 10.1016/j.psj.2022.102250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 10/11/2022] [Indexed: 11/06/2022] Open
Abstract
Avian metapneumovirus (aMPV) is an important causative agent that causes acute respiratory disease and egg-dropping in chickens and turkeys. Here, we characterized an aMPV subgroup C (aMPV/C) from 320-day-old broiler breeder chickens with severe respiratory diseases in Beijing, China, as evidenced by RT-PCR typing and confirmation of the nucleoprotein (N) gene sequence. The N gene sequence of the aMPV/C strain (designated BJ17) exhibited no deletions or insertions and possessed 94.6% to 99.6% identity to those of published aMPV/C isolates. The phylogenetic tree of the nucleotide sequences constructed using the neighbor-joining clustering method showed that the BJ17 strain formed one cluster with other aMPV/C viruses and formed one subcluster with published Chinese aMPV/C isolates regardless of Muscovy duck or chicken origins. Comparative analysis of the N proteins showed that a unique amino acid residue D at position 110 might be associated with regional distribution due to its occurrence in all the Chinese aMPV/C isolates only. Strain BJ17 was successfully isolated by cultured Vero cell passage and further inoculated in 3-wk-old specific-pathogen-free chickens for the examination of pathogenicity. Animal experimental results showed that BJ17-inoculated chickens had severe respiratory diseases and inflammatory lesions, as demonstrated by pathological changes and aMPV antigen in the nasal turbinate, tracheae, and lung tissues. These results enrich the available information regarding the epidemiology and pathogenicity of aMPV/C in chickens, which may facilitate the development of effective measures against aMPV/C infection in China.
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Affiliation(s)
- Jing Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Lei Hou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Li Wei
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Xv Yan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Shanshan Zhu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Rong Quan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Zixuan Li
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Dan Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Haijun Jiang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Jiangwei Song
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Beijing, China
| | - Yongqiu Cui
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Jue Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China,Corresponding author:
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5
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Kariithi HM, Christy N, Decanini EL, Lemiere S, Volkening JD, Afonso CL, Suarez DL. Detection and Genome Sequence Analysis of Avian Metapneumovirus Subtype A Viruses Circulating in Commercial Chicken Flocks in Mexico. Vet Sci 2022; 9:vetsci9100579. [PMID: 36288192 PMCID: PMC9612082 DOI: 10.3390/vetsci9100579] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 11/11/2022] Open
Abstract
Avian metapneumoviruses (aMPV subtypes A-D) are respiratory and reproductive pathogens of poultry. Since aMPV-A was initially reported in Mexico in 2014, there have been no additional reports of its detection in the country. Using nontargeted next-generation sequencing (NGS) of FTA card-spotted respiratory samples from commercial chickens in Mexico, seven full genome sequences of aMPV-A (lengths of 13,288-13,381 nucleotides) were de novo assembled. Additionally, complete coding sequences of genes N (n = 2), P and M (n = 7 each), F and L (n = 1 each), M2 (n = 6), SH (n = 5) and G (n = 2) were reference-based assembled from another seven samples. The Mexican isolates phylogenetically group with, but in a distinct clade separate from, other aMPV-A strains. The genome and G-gene nt sequences of the Mexican aMPVs are closest to strain UK/8544/06 (97.22-97.47% and 95.07-95.83%, respectively). Various amino acid variations distinguish the Mexican isolates from each other, and other aMPV-A strains, most of which are in the G (n = 38), F (n = 12), and L (n = 19) proteins. Using our sequence data and publicly available aMPV-A data, we revised a previously published rRT-PCR test, which resulted in different cycling and amplification conditions for aMPV-A to make it more compatible with other commonly used rRT-PCR diagnostic cycling conditions. This is the first comprehensive sequence analysis of aMPVs in Mexico and demonstrates the value of nontargeted NGS to identify pathogens where targeted virus surveillance is likely not routinely performed.
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Affiliation(s)
- Henry M. Kariithi
- Exotic and Emerging Avian Viral Diseases Research Unit, Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, USDA-ARS, Athens, GA 30605, USA
- Biotechnology Research Institute, Kenya Agricultural and Livestock Research Organization, Kaptagat Rd, Nairobi P.O. Box 57811-00200, Kenya
- Correspondence: (H.M.K.); (D.L.S.); Tel.: +1-(706)-546-3479 (D.L.S.)
| | - Nancy Christy
- Boehringer Ingelheim Animal Health, Guadalajara 44940, Mexico
| | - Eduardo L. Decanini
- Boehringer Ingelheim Animal Health IMETA, Dubai P.O. Box 507066, United Arab Emirates
| | | | | | | | - David L. Suarez
- Exotic and Emerging Avian Viral Diseases Research Unit, Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, USDA-ARS, Athens, GA 30605, USA
- Correspondence: (H.M.K.); (D.L.S.); Tel.: +1-(706)-546-3479 (D.L.S.)
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Pereira MR, Machado LC, de Oliveira Carvalho RD, de Lima Cavalcanti TYV, da Silva Filho GB, de Sousa Lima T, Fonseca SMC, de Assis Leite Souza F, da Luz Wallau G, de Souza Mendonça F, de Oliveira Franca RF. Identification of a Virulent Newcastle Disease Virus Strain Isolated from Pigeons (Columbia livia) in Northeastern Brazil Using Next-Generation Genome Sequencing. Viruses 2022; 14:v14071579. [PMID: 35891559 PMCID: PMC9319777 DOI: 10.3390/v14071579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/11/2022] [Accepted: 07/15/2022] [Indexed: 02/05/2023] Open
Abstract
Newcastle disease virus (NDV), also known as avian paramyxoviruses 1 (APMV-1) is among the most important viruses infecting avian species. Given its widespread circulation, there is a high risk for the reintroduction of virulent strains into the domestic poultry industry, making the surveillance of wild and domestic birds a crucial process to appropriately respond to novel outbreaks. In the present study, we investigated an outbreak characterized by the identification of sick pigeons in a large municipality in Northeastern Brazil in 2018. The affected pigeons presented neurological signs, including motor incoordination, torticollis, and lethargy. Moribund birds were collected, and through a detailed histopathological analysis we identified severe lymphoplasmacytic meningoencephalitis with perivascular cuffs and gliosis in the central nervous system, and lymphoplasmacytic inflammation in the liver, kidney, and intestine. A total of five pigeons tested positive for NDV, as assessed by rRT-PCR targeted to the M gene. Laboratory virus isolation on Vero E6 cells confirmed infection, after the recovery of infectious NVD from brain and kidney tissues. We next characterized the isolated NDV/pigeon/PE-Brazil/MP003/2018 by next-generation sequencing (NGS). Phylogenetic analysis grouped the virus with other NDV class II isolates from subgenotype VI.2.1.2, including two previous NDV isolates from Brazil in 2014 and 2019. The diversity of aminoacid residues at the fusion F protein cleavage site was analyzed identifying the motif RRQKR↓F, typical of virulent strains. Our results all highlight the importance of virus surveillance in wild and domestic birds, especially given the risk of zoonotic NDV.
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Affiliation(s)
- Mylena Ribeiro Pereira
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
- Department of Virology and Experimental Therapy, Oswaldo Cruz Foundation—Fiocruz, Recife 54740-465, PE, Brazil;
| | - Lais Ceschini Machado
- Department of Entomology, Oswaldo Cruz Foundation—Fiocruz, Recife 54740-465, PE, Brazil; (L.C.M.); (R.D.d.O.C.); (G.d.L.W.)
| | | | | | - Givaldo Bom da Silva Filho
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
| | - Telma de Sousa Lima
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
| | - Silvio Miguel Castillo Fonseca
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
| | - Francisco de Assis Leite Souza
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
| | - Gabriel da Luz Wallau
- Department of Entomology, Oswaldo Cruz Foundation—Fiocruz, Recife 54740-465, PE, Brazil; (L.C.M.); (R.D.d.O.C.); (G.d.L.W.)
| | - Fábio de Souza Mendonça
- Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife 52171-900, PE, Brazil; (M.R.P.); (G.B.d.S.F.); (T.d.S.L.); (S.M.C.F.); (F.d.A.L.S.)
- Correspondence: (F.d.S.M.); (R.F.d.O.F.)
| | - Rafael Freitas de Oliveira Franca
- Department of Virology and Experimental Therapy, Oswaldo Cruz Foundation—Fiocruz, Recife 54740-465, PE, Brazil;
- Correspondence: (F.d.S.M.); (R.F.d.O.F.)
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Wang D, Hou L, Zhu N, Yang X, Zhou J, Cui Y, Guo J, Feng X, Liu J. Interaction of Nucleolin with the Fusion Protein of Avian Metapneumovirus Subgroup C Contributes to Viral Replication. Viruses 2022; 14:v14071402. [PMID: 35891383 PMCID: PMC9317408 DOI: 10.3390/v14071402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/23/2022] [Accepted: 06/24/2022] [Indexed: 12/02/2022] Open
Abstract
Avian metapneumovirus subgroup C (aMPV/C) is highly pathogenic to various avian species with acute respiratory tract clinicopathology and/or drops in egg production. Nucleolin (NCL), an important nucleolar protein, has been shown to regulate multiple viral replication and serve as a functional receptor for viral entry and internalization. Whether NCL is involved in aMPV/C pathogenesis is not known. In this study, we found that aMPV/C infection altered the subcellular localization of NCL in cultured cells. siRNA-targeted NCL resulted in a remarkable decline in aMPV/C replication in Vero cells. DF-1 cells showed a similar response after CRISPR/Cas9-mediated knock out of NCL during aMPV/C infection. Conversely, NCL overexpression significantly increased aMPV/C replication. Pretreatment with AS1411-a aptamer, a guanine (G)-rich oligonucleotide that forms four-stranded structures and competitively binding to NCL, decreased aMPV/C replication and viral titers in cultured cells. Additionally, we found that the aMPV/C fusion (F) protein specifically interacts with NCL through its central domain and that AS1411 disrupts this interaction, thus inhibiting viral replication. Taken together, these results reveal that the aMPV/C F protein interacts with NCL, which is employed by aMPV/C for efficient replication, thereby highlighting the strategic potential for control and therapy of aMPV/C infection.
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Affiliation(s)
- Dedong Wang
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Lei Hou
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Ning Zhu
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Xiaoyu Yang
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jianwei Zhou
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Yongqiu Cui
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jinshuo Guo
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Xufei Feng
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jue Liu
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
- Correspondence:
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Zoonotic Origins of Human Metapneumovirus: A Journey from Birds to Humans. Viruses 2022; 14:v14040677. [PMID: 35458407 PMCID: PMC9028271 DOI: 10.3390/v14040677] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/23/2022] [Accepted: 03/23/2022] [Indexed: 01/13/2023] Open
Abstract
Metapneumoviruses, members of the family Pneumoviridae, have been identified in birds (avian metapneumoviruses; AMPV’s) and humans (human metapneumoviruses; HMPV’s). AMPV and HMPV are closely related viruses with a similar genomic organization and cause respiratory tract illnesses in birds and humans, respectively. AMPV can be classified into four subgroups, A–D, and is the etiological agent of turkey rhinotracheitis and swollen head syndrome in chickens. Epidemiological studies have indicated that AMPV also circulates in wild bird species which may act as reservoir hosts for novel subtypes. HMPV was first discovered in 2001, but retrospective studies have shown that HMPV has been circulating in humans for at least 50 years. AMPV subgroup C is more closely related to HMPV than to any other AMPV subgroup, suggesting that HMPV has evolved from AMPV-C following zoonotic transfer. In this review, we present a historical perspective on the discovery of metapneumoviruses and discuss the host tropism, pathogenicity, and molecular characteristics of the different AMPV and HMPV subgroups to provide increased focus on the necessity to better understand the evolutionary pathways through which HMPV emerged as a seasonal endemic human respiratory virus.
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9
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Graziosi G, Mescolini G, Silveira F, Lupini C, Tucciarone CM, Franzo G, Cecchinato M, Legnardi M, Gobbo F, Terregino C, Catelli E. First detection of Avian metapneumovirus subtype C Eurasian Lineage in a Eurasian wigeon ( Mareca penelope) wintering in Northeastern Italy: an additional hint on the role of migrating birds in the viral epidemiology. Avian Pathol 2022; 51:283-290. [PMID: 35261311 DOI: 10.1080/03079457.2022.2051429] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Avian metapneumovirus (aMPV) economically affects the global poultry industry causing respiratory and reproductive disorders. Considering the paucity of data on the aMPV occurrence in European free-ranging avifauna, a molecular survey was conducted on wild birds of 23 species belonging to the orders Anseriformes, Charadriiformes or Passeriformes, captured alive and sampled in Northeast Italy as part of the national Avian influenza virus (AIV) surveillance activities. A total of 492 oropharyngeal swabs, collected from 2007 to 2010, all AIV negative, were screened from aMPV by subtype-specific qRT-PCR. An aMPV-C strain, named aMPV/C/IT/Wigeon/758/07, was found in a wintering young Eurasian wigeon (Mareca penelope) sampled in November 2007. The matrix, fusion, and attachment glycoprotein genes of the detected strain were subsequently amplified by specific independent RT-PCRs, then sequenced, and compared in a phylogenetic framework with known aMPV homologous sequences retrieved from GenBank. Close genetic relationships were found between the aMPV/C/IT/Wigeon/758/07 strain and subtype C Eurasian lineage strains isolated in the late 1990s in French domestic ducks, suggesting epidemiological links. Eurasian wigeons are indeed medium to long-range migrant dabbling ducks that move along the Black Sea/Mediterranean flyway, our finding might therefore be related to migratory bridges between countries. To our knowledge, this is the first molecular evidence of the occurrence of a subtype C in Italy and backdates the aMPV-C circulation to 2007. Moreover, results suggest the susceptibility of Eurasian wigeons to aMPV. Broader investigations are needed to assess the role of wild ducks and the significance of the wildfowl/poultry interface in the aMPV-C epidemiology.
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Affiliation(s)
- Giulia Graziosi
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell'Emilia, BO, Italy
| | - Giulia Mescolini
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell'Emilia, BO, Italy
| | - Flavio Silveira
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell'Emilia, BO, Italy
| | - Caterina Lupini
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell'Emilia, BO, Italy
| | - Claudia M Tucciarone
- Department of Animal Medicine, Production and Health, University of Padua, 35020 Legnaro, PD, Italy
| | - Giovanni Franzo
- Department of Animal Medicine, Production and Health, University of Padua, 35020 Legnaro, PD, Italy
| | - Mattia Cecchinato
- Department of Animal Medicine, Production and Health, University of Padua, 35020 Legnaro, PD, Italy
| | - Matteo Legnardi
- Department of Animal Medicine, Production and Health, University of Padua, 35020 Legnaro, PD, Italy
| | - Federica Gobbo
- Comparative Biomedical Sciences Division, Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, PD, Italy
| | - Calogero Terregino
- Comparative Biomedical Sciences Division, Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, PD, Italy
| | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell'Emilia, BO, Italy
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Hosseini H, Ziafati Kafi Z, Malekan M, Ghafouri SA, Fallah Mehrabadi MH, Sadri N, Hojabr Rajeoni A, Ghalyanchilangeroudi A. Molecular characterization of circulating avian metapneumovirus, subgroup B, in broiler chickens, Iran, 2016-2018. IRANIAN JOURNAL OF VETERINARY RESEARCH 2021; 22:217-221. [PMID: 34777522 DOI: 10.22099/ijvr.2021.38859.5660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 01/09/2021] [Accepted: 03/07/2021] [Indexed: 09/30/2022]
Abstract
Background Avian metapneumovirus (aMPV) infection has significant economic impacts on the poultry industry all around the world. Aims The aim of this study is molecular investigations of different types of aMPV in broiler farms in different provinces of Iran from 2016 to 2018. Methods Tracheal and oropharyngeal swabs were collected from two hundred broiler chickens with respiratory signs in ten provinces of Iran, including Kurdistan, West Azerbaijan, Semnan, Esfahan, Sistan and Baluchistan, Qazvin, Khuzestan, Fars, Gilan, and Khorasan Razavi from February 2016 to December 2018. After RNA extraction, the presence of aMPV was confirmed using N gene special primers. Then, subtype-specific primers were utilized to differentiate the specific subtype. All positive samples were sequenced. Results As a general trend, the percentage of aMPV positive chickens increased gradually over time. All samples were clustered together and placed in the subtype B aMPV group. Although 2 samples from 2016 and 2 samples from 2018 were placed in a separate branch, most of the current study samples of 2016, 2017, and 2018 revealed six segregated sub-branches, and they were placed close to other isolates of 2011 and 2013 from Iran. Conclusion The current field study indicated the presence of aMPV in a considerable number of areas in Iran. Thus, the role of this virus in broiler respiratory complex should not be neglected.
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Affiliation(s)
- H Hosseini
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Z Ziafati Kafi
- Ph.D. Student in Virology, Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - M Malekan
- Department of Veterinary Service, Savapars Company (Ceva Sante Animale Co. Exclusive Distributor in Iran), Tehran, Iran
| | - S A Ghafouri
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - M H Fallah Mehrabadi
- Department of Poultry Diseases, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - N Sadri
- Ph.D. Student in Virology, Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - A Hojabr Rajeoni
- Ph.D. Student in Virology, Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - A Ghalyanchilangeroudi
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
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11
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Gethöffer F, Curland N, Voigt U, Woelfing B, Ludwig T, Heffels-Redmann U, Hafez HM, Lierz M, Siebert U. Seroprevalences of specific antibodies against avian pathogens in free-ranging ring-necked pheasants (Phasianus colchicus) in Northwestern Germany. PLoS One 2021; 16:e0255434. [PMID: 34347834 PMCID: PMC8336876 DOI: 10.1371/journal.pone.0255434] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 06/06/2021] [Indexed: 11/19/2022] Open
Abstract
Infectious diseases in captive pheasants (Phasianus colchicus) are well known, but there is a lack of knowledge about occurrence and distribution of pathogens in free-ranging pheasants in Germany. We investigated 604 sera from hunted pheasants and 152 sera from wild caught pheasants between 2011 to 2015, with the aim to determine the prevalence of specific antibodies against different viruses: Avian influenza virus (AIV) of subtypes H5, H7, H9, paramyxovirus type 1 (PMV-1), avian encephalomyelitis virus (AEV), infectious bursitis disease virus (IBDV), infectious bronchitis virus (IBV), infectious laryngotracheitis virus (ILTV), avian metapneumovirus (aMPV) and Salmonella sp., Mycoplasma synoviae (MS) and Mycoplasma gallisepticum (MG). In addition, 178 caeca were investigated for Histomonas meleagridis. The study reveals an ongoing circulation of IBV in the wild pheasant population during the study. Also high seroprevalences of specific antibodies against aMPV depending on the area and a strong increase in prevalence of IBDV antibodies in sera of pheasants in Lower Saxony were detected. ILTV antibody prevalences differed between areas and AEV antibody detection differed between years significantly, whereas specific antibodies against PMV-1 could not be detected and antibodies against AIV-H5, -H7 and -H9 and Mycoplasma spp. were detected in very few cases.
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Affiliation(s)
- Friederike Gethöffer
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Nele Curland
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Ulrich Voigt
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Benno Woelfing
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Tobias Ludwig
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Ursula Heffels-Redmann
- Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig Universität Giessen, Giessen, Germany
| | | | - Michael Lierz
- Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig Universität Giessen, Giessen, Germany
| | - Ursula Siebert
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Hannover, Germany
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12
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Bao Y, Yu M, Liu P, Hou F, Muhammad F, Wang Z, Li X, Zhang Z, Wang S, Chen Y, Cui H, Liu A, Qi X, Pan Q, Zhang Y, Gao L, Li K, Liu C, He X, Wang X, Gao Y. Novel Inactivated Subtype B Avian Metapneumovirus Vaccine Induced Humoral and Cellular Immune Responses. Vaccines (Basel) 2020; 8:vaccines8040762. [PMID: 33327513 PMCID: PMC7768545 DOI: 10.3390/vaccines8040762] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/11/2020] [Accepted: 12/13/2020] [Indexed: 12/12/2022] Open
Abstract
Avian metapneumovirus (aMPV), a highly contagious agent, is widespread and causes acute upper respiratory tract disease in chickens and turkeys. However, currently, there is no vaccine licensed in China. Herein, we describe the development of an inactivated aMPV/B vaccine using the aMPV/B strain LN16. Combined with a novel adjuvant containing immune-stimulating complexes (ISCOMs), the novel vaccine could induce high virus-specific and VN antibodies. In addition, it activated B and T lymphocytes and promoted the expression of IL-4 and IFN-γ. Importantly, boosting vaccination with the inactivated aMPV/B vaccine could provide 100% protection against aMPV/B infection with reduced virus shedding and turbinate inflammation. The protection efficacy could last for at least 6 months. This study yielded a novel inactivated aMPV/B vaccine that could serve as the first vaccine candidate in China, thus contributing to the control of aMPV/B and promoting the development of the poultry industry.
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Affiliation(s)
- Yuanling Bao
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Mengmeng Yu
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Peng Liu
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Fujun Hou
- Aohan County Breeding and Extension Center, Chifeng, Inner Mongolia 024300, China;
| | - Farooque Muhammad
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Zhihao Wang
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Xinyi Li
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Zhuo Zhang
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Suyan Wang
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Yuntong Chen
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Hongyu Cui
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Aijing Liu
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Xiaole Qi
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Qing Pan
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Yanping Zhang
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Li Gao
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Kai Li
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Changjun Liu
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Xijun He
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Xiaomei Wang
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
| | - Yulong Gao
- State Key Laboratory of Veterinary Biotechnology, Avian Immunosuppressive Diseases Division, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China; (Y.B.); (M.Y.); (P.L.); (F.M.); (Z.W.); (X.L.); (Z.Z.); (S.W.); (Y.C.); (H.C.); (A.L.); (X.Q.); (Q.P.); (Y.Z.); (L.G.); (K.L.); (C.L.); (X.H.); (X.W.)
- Correspondence:
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13
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Franzo G, Legnardi M, Mescolini G, Tucciarone CM, Lupini C, Quaglia G, Catelli E, Cecchinato M. Avian Metapneumovirus subtype B around Europe: a phylodynamic reconstruction. Vet Res 2020; 51:88. [PMID: 32641149 PMCID: PMC7346485 DOI: 10.1186/s13567-020-00817-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 06/25/2020] [Indexed: 11/10/2022] Open
Abstract
Avian Metapneumovirus (aMPV) has been recognized as a respiratory pathogen of turkey and chickens for a long time. Recently, a crescent awareness of aMPV, especially subtype B, clinical and economic impact has risen among European researchers and veterinarians. Nevertheless, the knowledge of its epidemiology and evolution is still limited. In the present study, the broadest available collection of partial G gene sequences obtained from European aMPV-B strains was analyzed using different phylodynamic and biostatistical approaches to reconstruct the viral spreading over time and the role of different hosts on its evolution. After aMPV-B introduction, approximatively in 1985 in France, the infection spread was relatively quick, involving the Western and Mediterranean Europe until the end of the 1990s, and then spreading westwards at the beginning of the new millennium, in parallel with an increase of viral population size. In the following period, a wider mixing among aMPV-B strains detected in eastern and western countries could be observed. Most of the within-country genetic heterogeneity was ascribable to single or few introduction events, followed by local circulation. This, combined with the high evolutionary rate herein demonstrated, led to the establishment of genetically and phenotypically different clusters among countries, which could affect the efficacy of natural or vaccine-induced immunity and should be accounted for when planning control measure implementation. On the contrary, while a significant strain exchange was proven among turkey, guinea fowl and chicken, no evidence of differential selective pressures or specific amino-acid mutations was observed, suggesting that no host adaptation is occurring.
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Affiliation(s)
- Giovanni Franzo
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, PD, Italy.
| | - Matteo Legnardi
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, PD, Italy
| | - Giulia Mescolini
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'emilia, BO, Italy
| | | | - Caterina Lupini
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'emilia, BO, Italy
| | - Giulia Quaglia
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'emilia, BO, Italy
| | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'emilia, BO, Italy
| | - Mattia Cecchinato
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, PD, Italy
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14
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Curland N, Gethöffer F, van Neer A, Ziegler L, Heffels-Redmann U, Lierz M, Baumgärtner W, Wohlsein P, Völker I, Lapp S, Bello A, Pfankuche VM, Braune S, Runge M, Moss A, Rautenschlein S, Jung A, Teske L, Strube C, Schulz J, Bodewes R, Osterhaus ADME, Siebert U. Investigation into diseases in free-ranging ring-necked pheasants ( Phasianus colchicus) in northwestern Germany during population decline with special reference to infectious pathogens. EUR J WILDLIFE RES 2018; 64:12. [PMID: 32214944 PMCID: PMC7087779 DOI: 10.1007/s10344-018-1173-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 11/06/2017] [Accepted: 01/19/2018] [Indexed: 11/29/2022]
Abstract
The population of ring-necked pheasants (Phasianus colchicus) is decreasing all over Germany since the years 2008/2009. Besides impacts of habitat changes caused by current rates of land conversion, climatic influences or predators, a contribution of infectious pathogens needs also to be considered. Infectious and non-infectious diseases in free-living populations of ring-necked pheasants have been scarcely investigated so far. In the present study, carcasses of 258 deceased free-ranging pheasants of different age groups, predominantly adult pheasants, collected over a period of 4 years in the states of Lower Saxony, North Rhine–Westphalia and Schleswig-Holstein, were examined pathomorphologically, parasitologically, virologically and bacteriologically, with a focus set on infectious pathogens. A periocular and perinasal dermatitis of unknown origin was present in 62.3% of the pheasants. Additional alterations included protozoal cysts in the skeletal musculature (19.0%), hepatitis (21.7%), enteritis (18.7%), gastritis (12.6%), and pneumonia (11.7%). In single cases, neoplasms (2.6%) and mycobacteriosis (1.7%) occurred. Further findings included identification of coronaviral DNA from trachea or caecal tonsils (16.8%), siadenoviral DNA (7.6%), avian metapneumoviral RNA (6.6%), and infectious bursal disease viral RNA (3.7%). Polymerase chain reaction (PCR) on herpesvirus, avian influenza virus (AIV), paramyxovirus type 1 (PMV-1), avian encephalomyelitis virus (AEV), and chlamydia were negative. Based on the present results, there is no indication of a specific pathogen as a sole cause for population decline in adult pheasants. However, an infectious disease can still not be completely excluded as it may only affect reproduction effectivity or a certain age group of pheasants (e.g., chicks) which were not presented in the study.
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Affiliation(s)
- N Curland
- 1Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - F Gethöffer
- 1Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - A van Neer
- 1Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - L Ziegler
- 2Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig University Giessen, Frankfurter Strasse 91, 35321 Giessen, Germany
| | - U Heffels-Redmann
- 2Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig University Giessen, Frankfurter Strasse 91, 35321 Giessen, Germany
| | - M Lierz
- 2Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig University Giessen, Frankfurter Strasse 91, 35321 Giessen, Germany
| | - W Baumgärtner
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - P Wohlsein
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - I Völker
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - S Lapp
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - A Bello
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - V M Pfankuche
- 3Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - S Braune
- 4Lower Saxony State Office for Consumer Protection and Food Safety (LAVES), Food and Veterinary Institute Braunschweig/Hannover, Eintrachtweg 17, 30173 Hannover, Germany
| | - M Runge
- 4Lower Saxony State Office for Consumer Protection and Food Safety (LAVES), Food and Veterinary Institute Braunschweig/Hannover, Eintrachtweg 17, 30173 Hannover, Germany
| | - A Moss
- 5Lower Saxony State Office for Consumer Protection and Food Safety (LAVES), Food and Veterinary Institute Oldenburg, Philosophenweg 38, 26121 Oldenburg, Germany
| | - S Rautenschlein
- 6Clinic for Poultry, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - A Jung
- 6Clinic for Poultry, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - L Teske
- 6Clinic for Poultry, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - C Strube
- 7Institute for Parasitology, Center for Infection Medicine, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - J Schulz
- 8Institute for Animal Hygiene, Animal Welfare and Farm Animal Behaviour, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - R Bodewes
- Department of Viroscience, Erasmus MC, P.O. Box 2040, Ee1726, 3000 CA Rotterdam, The Netherlands
| | - A D M E Osterhaus
- 10Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hannover, Foundation, Buenteweg 17, 30559 Hannover, Germany
| | - U Siebert
- 1Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
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Hou L, Wei L, Zhu S, Wang J, Quan R, Li Z, Liu J. Avian metapneumovirus subgroup C induces autophagy through the ATF6 UPR pathway. Autophagy 2017; 13:1709-1721. [PMID: 28949785 PMCID: PMC5640183 DOI: 10.1080/15548627.2017.1356950] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 06/16/2017] [Accepted: 07/12/2017] [Indexed: 12/12/2022] Open
Abstract
An increasing number of studies have demonstrated that macroautophagy/autophagy plays an important role in the infectious processes of diverse pathogens. However, it remains unknown whether autophagy is induced in avian metapneumovirus (aMPV)-infected host cells, and, if so, how this occurs. Here, we report that aMPV subgroup C (aMPV/C) induces autophagy in cultured cells. We demonstrated this relationship by detecting classical autophagic features, including the formation of autophagsomes, the presence of GFP-LC3 puncta and the conversation of LC3-I into LC3-II. Also, we used pharmacological regulators and siRNAs targeting ATG7 or LC3 to examine the role of autophagy in aMPV/C replication. The results showed that autophagy is required for efficient replication of aMPV/C. Moreover, infection with aMPV/C promotes autophagosome maturation and induces a complete autophagic process. Finally, the ATF6 pathway, of which one component is the unfolded protein response (UPR), becomes activated in aMPV/C-infected cells. Knockdown of ATF6 inhibited aMPV/C-induced autophagy and viral replication. Collectively, these results not only show that autophagy promotes aMPV/C replication in the cultured cells, but also reveal that the molecular mechanisms underlying aMPV/C-induced autophagy depends on regulation of the ER stress-related UPR pathway.
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Affiliation(s)
- Lei Hou
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Li Wei
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Shanshan Zhu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Jing Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Rong Quan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Zixuan Li
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Jue Liu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
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16
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Hartmann S, Sid H, Rautenschlein S. Avian metapneumovirus infection of chicken and turkey tracheal organ cultures: comparison of virus-host interactions. Avian Pathol 2016; 44:480-9. [PMID: 26365279 DOI: 10.1080/03079457.2015.1086974] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Avian metapneumovirus (aMPV) is a pathogen with worldwide distribution, which can cause high economic losses in infected poultry. aMPV mainly causes infection of the upper respiratory tract in both chickens and turkeys, although turkeys seem to be more susceptible. Little is known about virus-host interactions at epithelial surfaces after aMPV infection. Tracheal organ cultures (TOC) are a suitable model to investigate virus-host interaction in the respiratory epithelium. Therefore, we investigated virus replication rates and lesion development in chicken and turkey TOC after infection with a virulent aMPV subtype A strain. Aspects of the innate immune response, such as interferon-α and inducible nitric oxide synthase mRNA expression, as well as virus-induced apoptosis were determined. The aMPV-replication rate was higher in turkey (TTOC) compared to chicken TOC (CTOC) (P < 0.05), providing circumstantial evidence that indeed turkeys may be more susceptible. The interferon-α response was down-regulated from 2 to 144 hours post infection in both species compared to virus-free controls (P < 0.05); this was more significant for CTOC than TTOC. Inducible nitric oxide synthase expression was significantly up-regulated in aMPV-A-infected TTOC and CTOC compared to virus-free controls (P < 0.05). However, the results suggest that NO may play a different role in aMPV pathogenesis between turkeys and chickens as indicated by differences in apoptosis rate and lesion development between species. Overall, our study reveals differences in innate immune response regulation and therefore may explain differences in aMPV - A replication rates between infected TTOC and CTOC, which subsequently lead to more severe clinical signs and a higher rate of secondary infections in turkeys.
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Affiliation(s)
- Sandra Hartmann
- a Clinic for Poultry , University of Veterinary Medicine Hannover , Hannover , Germany
| | - Hicham Sid
- a Clinic for Poultry , University of Veterinary Medicine Hannover , Hannover , Germany
| | - Silke Rautenschlein
- a Clinic for Poultry , University of Veterinary Medicine Hannover , Hannover , Germany
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17
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Paudel S, Easwaran M, Jang H, Jung HK, Kim JH, Shin HJ. Immunization with avian metapneumovirus harboring chicken Fc induces higher immune responses. Virus Res 2016; 220:129-35. [PMID: 27130629 DOI: 10.1016/j.virusres.2016.04.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 04/12/2016] [Accepted: 04/18/2016] [Indexed: 10/21/2022]
Abstract
In this study, we evaluated the immune responses of avian metapneumovirus harboring chicken Fc molecule. Stable Vero cells expressing chicken Fc chimera on its surface (Vero-cFc) were established, and we confirmed that aMPV grown in Vero-cFc incorporated host derived chimera Fc into the aMPV virions. Immunization of chicken with aMPV-cFc induced higher level of antibodies and inflammatory cytokines; (Interferon (IFN)-γ and Interleukin (IL)-1β) compared to those of aMPV. The increased levels of antibodies and inflammatory cytokines in chicken immunized with aMPV-cFc were statistically significantly (p<0.05) to that of aMPV and control. The aMPV-cFc group also generated the highest neutralizing antibody response. After challenges, chickens immunized with aMPV-cFc showed much less pathological signs in nasal turbinates and trachea so that we could confirm aMPV-cFc induced higher protection than that of aMPV. The greater ability of aMPV harboring chicken Fc to that of aMPV presented it as a possible vaccine candidate.
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Affiliation(s)
- Sarita Paudel
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Maheswaran Easwaran
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Hyun Jang
- Komipharm Co., Ltd., Republic of Korea
| | | | - Joo-Hun Kim
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea; Research Institute of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea; Komipharm Co., Ltd., Republic of Korea
| | - Hyun-Jin Shin
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea; Research Institute of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea.
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18
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Paudel S, Shin HJ. Role of trypsin in the replication of Avian metapneumovirus subtype C (strain MN-2a) and its entry into the Vero cells. Mol Cell Probes 2015; 29:485-491. [PMID: 26028611 DOI: 10.1016/j.mcp.2015.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 05/12/2015] [Accepted: 05/27/2015] [Indexed: 01/12/2023]
Abstract
To understand the molecular mechanisms of Avian metapneumovirus (aMPV) and the requirements involved in the infection and fusion, trypsin treatment was done in the different stages of virus; before infection, during entry and after virus infection followed by aMPV infection. The growth kinetics of aMPV was compared in time dependent manner. The effect of trypsin was found in the later stage of aMPV infection increasing the numbers of infected cells with the significant higher titer of infectious virions to that of trypsin treated before infection, during entry and aMPV. A serine protease inhibitor reduced aMPV replication in a significant way, whereas cysteine peptidase (E-64), aspartic protease (pepstatin A), and metalloprotease (phosphoramidon) inhibitors had no effect on aMPV replication. Inoculation of aMPV on Vero cells expressing the membrane-associated protease TMPRSS2 resulted in higher virus titers than that inoculated on normal Vero cells and is statistically significant (p < 0.05). Also, an inhibitor of clathrin/caveolae-mediated endocytosis had no effect on virus progeny, indicating that aMPV does not use the endocytic pathway for entry but undergoes direct fusion. The effect of lysosomotropic agents was not significant, suggesting that aMPV does not require low-pH environment in endosomes to fuse its envelope with the plasma membrane.
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Affiliation(s)
- Sarita Paudel
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Republic of Korea
| | - Hyun-Jin Shin
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Republic of Korea; Research Institute of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Republic of Korea.
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19
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Rivera-Benitez JF, Martínez-Bautista R, Ríos-Cambre F, Ramírez-Mendoza H. Molecular detection and isolation of avian metapneumovirus in Mexico. Avian Pathol 2014; 43:217-23. [PMID: 24617750 DOI: 10.1080/03079457.2014.903557] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We conducted a longitudinal study to detect and isolate avian metapneumovirus (aMPV) in two highly productive poultry areas in Mexico. A total of 968 breeder hens and pullets from 2 to 73 weeks of age were analysed. Serology was performed to detect aMPV antibodies and 105 samples of tracheal tissue were collected, pooled by age, and used for attempted virus isolation and aMPV nested reverse transcriptase-polymerase chain reaction (nRT-PCR). The serological analysis indicated that 100% of the sampled chickens showed aMPV antibodies by 12 weeks of age. Five pools of pullet samples collected at 3 to 8 weeks of age were positive by nRT-PCR and the sequences obtained indicated 98 to 99% similarity with the reported sequences for aMPV subtype A. Virus isolation of nRT-PCR-positive samples was successfully attempted using chicken embryo lung and trachea mixed cultures with subsequent adaptation to Vero cells. This is the first report of detection and isolation of aMPV in Mexico.
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Affiliation(s)
- José Francisco Rivera-Benitez
- a Departamento de Microbiología e Inmunología, Facultad de Medicina Veterinaria y Zootecnia , Universidad Nacional Autónoma de México , Mexico City , Mexico
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Wei L, Zhu S, Yan X, Wang J, Zhang C, Liu S, She R, Hu F, Quan R, Liu J. Avian metapneumovirus subgroup C infection in chickens, China. Emerg Infect Dis 2014; 19:1092-4. [PMID: 23763901 PMCID: PMC3903454 DOI: 10.3201/eid1907.121126] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Avian metapneumovirus causes acute respiratory tract infection and reductions in egg production in various avian species. We isolated and characterized an increasingly prevalent avian metapneumovirus subgroup C strain from meat-type commercial chickens with severe respiratory signs in China. Culling of infected flocks could lead to economic consequences.
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Affiliation(s)
- Li Wei
- Beijing Municipal Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Beijing, China
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21
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Clubbe J, Naylor CJ. Avian metapneumovirus M2:2 protein inhibits replication in Vero cells: modification facilitates live vaccine development. Vaccine 2011; 29:9493-8. [PMID: 22019755 DOI: 10.1016/j.vaccine.2011.10.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Revised: 08/25/2011] [Accepted: 10/07/2011] [Indexed: 10/16/2022]
Abstract
Throughout the world, avian metapneumovirus (AMPV) infection of subtype A is principally controlled by two live vaccines both derived from UK field strain #8544. Improvements of those vaccines by use of reverse genetics technology was found to be hampered by the inability of #8544 to replicate in the commonly exploited Vero cell based reverse genetics system. A systematic reverse genetics based genome modification of a DNA copy of #8544, employing sequence data from a Vero grown, #8544 derived, live vaccine; was used to determine mutations required to facilitate virus recovery and replication in Vero cells. This identified a single coding substitution in the M2:2 reading frame as responsible. Furthermore, ablation of M2:2 was found to elicit the same outcome. M2:2 sequence analysis of seven AMPVs found Vero cell adaption to be associated with non similar amino acid changes in M2:2. The study shows that M2:2 modification of field virus #8544 will enable research leading to improved vaccines. This may have more general application to other AMPV field strains.
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Affiliation(s)
- Jayne Clubbe
- Department of Infection Biology, Faculty of Health and Life Sciences, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, United Kingdom
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22
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Chacón JL, Mizuma M, Vejarano MP, Toquín D, Eterradossi N, Patnayak DP, Goyal SM, Ferreira AJP. Avian metapneumovirus subtypes circulating in Brazilian vaccinated and nonvaccinated chicken and turkey farms. Avian Dis 2011; 55:82-9. [PMID: 21500641 DOI: 10.1637/9501-081310-reg.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Avian metapneumovirus (AMPV) causes turkey rhinotracheitis and is associated with swollen head syndrome in chickens, which is usually accompanied by secondary infections that increase mortality. AMPVs circulating in Brazilian vaccinated and nonvaccinated commercial chicken and turkey farms were detected using a universal reverse transcriptase (RT)-PCR assay that can detect the four recognized subtypes of AMPV. The AMPV status of 228 farms with respiratory and reproductive disturbances was investigated. AMPV was detected in broiler, hen, breeder, and turkey farms from six different geographic regions of Brazil. The detected viruses were subtyped using a nested RT-PCR assay and sequence analysis of the G gene. Only subtypes A and B were detected in both vaccinated and nonvaccinated farms. AMPV-A and AMPV-B were detected in 15 and 23 farms, respectively, while both subtypes were simultaneously found in one hen farm. Both vaccine and field viruses were detected in nonvaccinated farms. In five cases, the detected subtype was different than the vaccine subtype. Field subtype B virus was detected mainly during the final years of the survey period. These viruses showed high molecular similarity (more than 96% nucleotide similarity) among themselves and formed a unique phylogenetic group, suggesting that they may have originated from a common strain. These results demonstrate the cocirculation of subtypes A and B in Brazilian commercial farms.
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Affiliation(s)
- Jorge Luis Chacón
- Department of Pathology, College of Veterinary Medicine, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, Cidade Universitária, Butanā, CEP 05508-900, São Paulo, Brazil
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23
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Choi KS, Lee EK, Jeon WJ, Park MJ, Yoo YN, Kwon JH. Diagnostic utility of egg yolk for the detection of avian metapneumovirus antibodies in laying hens. Avian Dis 2011; 54:1230-6. [PMID: 21313844 DOI: 10.1637/9382-042710-reg.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Surveillance and diagnosis of avian metapneumovirus (AMPV) infection typically involve measurement of serum antibodies. In the current study, eggs instead of serum samples were used for the detection of AMPV antibodies in egg-laying chicken hens by enzyme-linked immunosorbent assay (ELISA). AMPV-free commercial layer hens were experimentally challenged with AMPV strain SC1509 through intravenous or oculonasal administration. Antibody levels were determined by ELISA. AMPV antibodies were detected in egg yolks from challenged hens by 7 days postinoculation (dpi), with the peak titer at 16 dpi. Antibody levels in eggs laid at 28 dpi correlated well (r = 0.93) with sera taken 28 dpi from the same hens. In a field trial of the yolk ELISA, six broiler breeder farms were surveyed, and all tested positive for AMPV antibodies in hen eggs, although positivity varied from farm to farm. Abnormal discolored eggs collected from outbreak farms had significantly higher titers of AMPV yolk antibodies than normal eggs from the same farm, unlike clinically healthy farms, where normal and abnormal eggs had similar antibody titers. These results indicate that diagnosis of AMPV infection by yolk ELISA to detect anti-AMPV antibodies may be a suitable alternative to serologic testing.
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Affiliation(s)
- Kang-Seuk Choi
- Avian Diseases Division, National Veterinary Research and Quarantine Service, 480 Anyang-6, Anyang, Gyeonggi 430-757, South Korea.
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Rubbenstroth D, Rautenschlein S. Compromised T-cell immunity in turkeys may lead to an unpredictable avian metapneumovirus vaccine response and variable protection against challenge. Avian Pathol 2010; 39:349-57. [DOI: 10.1080/03079457.2010.507240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Kwon JS, Lee HJ, Jeong SH, Park JY, Hong YH, Lee YJ, Youn HS, Lee DW, Do SH, Park SY, Choi IS, Lee JB, Song CS. Isolation and characterization of avian metapneumovirus from chickens in Korea. J Vet Sci 2010; 11:59-66. [PMID: 20195066 PMCID: PMC2833431 DOI: 10.4142/jvs.2010.11.1.59] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Avian metapneumovirus (aMPV) causes upper respiratory tract infections in chickens and turkeys. Although the swollen head syndrome (SHS) associated with aMPV in chickens has been reported in Korea since 1992, this is the study isolating aMPV from chickens in this country. We examined 780 oropharyngeal swab or nasal turbinate samples collected from 130 chicken flocks to investigate the prevalence of aMPV and to isolate aMPV from chickens from 2004-2008. Twelve aMPV subtype A and 13 subtype B strains were detected from clinical samples by the aMPV subtype A and B multiplex real-time reverse transcription polymerase chain reaction (RRT-PCR). Partial sequence analysis of the G glycoprotein gene confirmed that the detected aMPVs belonged to subtypes A and B. Two aMPVs subtype A out of the 25 detected aMPVs were isolated by Vero cell passage. In animal experiments with an aMPV isolate, viral RNA was detected in nasal discharge, although no clinical signs of SHS were observed in chickens. In contrast to chickens, turkeys showed severe nasal discharge and a relatively higher titer of viral excretion than chickens. Here, we reveal the co-circulation of aMPV subtypes A and B, and isolate aMPVs from chicken flocks in Korea.
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Affiliation(s)
- Ji-Sun Kwon
- Avian Disease Division, National Veterinary Research and Quarantine Service, Anyang, Korea
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26
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Chacón JL, Brandão PE, Buim M, Villarreal L, Ferreira AJP. Detection by reverse transcriptase-polymerase chain reaction and molecular characterization of subtype B avian metapneumovirus isolated in Brazil. Avian Pathol 2010; 36:383-7. [PMID: 17899462 DOI: 10.1080/03079450701589142] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Subtype B avian metapneumovirus (aMPV) was isolated and detected by reverse transcriptase-polymerase chain reaction (RT-PCR) in Brazilian commercial laying chicken flocks with no history of vaccination against aMPV and presenting respiratory signs and decreased egg production. RT-PCR results from samples from three affected flocks revealed that the three isolates were subtype B. Partial sequence analysis of the G glycoprotein gene confirmed that the samples belonged to subtype B and were not of the vaccine type. Comparison of nucleotide and amino acid sequences of the G gene of the three Brazilian aMPV samples with subtype B isolates from other countries revealed 95.1% to 96.1% identity. Nucleotide sequences showed 100% identity among the Brazilian subtype B samples and 95.6% identity with the subtype B vaccine strain used in Brazil. This work describes the circulation of subtype B aMPV in Brazil and discusses its importance in terms of disease epidemiology.
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Affiliation(s)
- Jorge Luis Chacón
- Department of Pathology, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva 87, Cidade Universitária, Butantã, São Paulo, SP, Brazil
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27
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Abstract
The use of vaccines is the main approach to control of the economically important poultry viral respiratory diseases infectious laryngotracheitis (ILT), avian metapneumovirus (aMPV) infections and infectious bronchitis (IB). This paper appraises the current methods of vaccine control in the light of the nature of each virus and epidemiological factors associated with each disease. Infectious laryngotracheitis virus (ILTV) exists as a single type with a wide range of disease severity. It is a serious disease in certain regions of the world. Recent work has distinguished molecular differences between vaccine and field strains and vaccine virus can be a cause of disease. Vaccines have remained unaltered for many years but new ones are being developed to counter vaccine side effects and reversion and reactivation of latent virus. Avian metapneumoviruses, the cause of turkey rhinotracheitis and respiratory disease in chickens exists as 4 subtypes, A, B, C and D. A and B are widespread and vaccines work well provided that accurate doses are given. Newer vaccine developments are designed to eliminate reversion and possibly counter the appearance of newer field strains which may break through established vaccine coverage. IB presents the biggest problem of the three. Being an unstable RNA virus, part of the viral genome that codes for the S1 spike gene can undergo mutation and recombination so that important antigenic variants can appear irregularly which may evade existing vaccine protection. While conventional vaccines work well against homologous types, new strategies are needed to counter this instability. Molecular approaches involving tailoring viruses to suit field challenges are in progress. However, the simple use of two genetically different vaccines to protect against a wide range of heterologous types is now a widespread practice that is very effective. None of the three diseases described can claim to be satisfactorily controlled and it remains to be seen whether the newer generations of vaccines will be more efficacious and cost effective. The importance of constant surveillance is emphasised and the testing of novel vaccines cannot be achieved without the use of vaccine-challenge experiments in poultry.
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Affiliation(s)
- Richard C Jones
- School of Veterinary Science, University of Liverpool, Neston, South Wirral, England, UK.
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28
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Cook JKA, Huggins MB, Orbell SJ, Senne DA. Preliminary antigenic characterization of an avian pneumovirus isolated from commercial turkeys in Colorado, USA. Avian Pathol 2010; 28:607-617. [PMID: 27266432 DOI: 10.1080/03079459994407] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
An avian pneumovirus (APV) isolated from turkeys showing respiratory disease in Colorado, USA, shared some characteristics with earlier subgroup A and B APV strains. This virus, designated the Colorado isolate (Colorado), when used after either seven passages in chick embryo fibroblasts (CEF), or seven passages in CEF followed by six turkey passages, induced clinical signs in turkeys that were similar to those caused by earlier APV strains. Although it induced an antibody response in specific pathogen free chickens, clinical signs were not seen. Unlike subgroups A or B, Colorado did not cause ciliostasis in tracheal organ cultures, but produced a cytopathic effect in chick embryo fibroblasts typical of that seen with other APV strains. Monospecific antisera to A or B strains did not neutralize Colorado and vice versa; nor did monoclonal antibodies, which neutralize subgroup A or B strains, neutralize Colorado. However, it was partially neutralized by a subgroup A hyperimmune serum. A homologous enzyme-linked immunosorbent assay (ELISA) antigen was essential for the detection of Colorado antibodies, since ELISAs in which subgroup A or B strains were used detected antibody to Colorado very poorly. Subgroup A and B vaccines protected turkeys against challenge with Colorado. However, while Colorado protected turkeys, and to some extent chickens, against subgroup A strains, protection against a subgroup B challenge was less good in both species. These results indicate that Colorado should be classified as an APV, but the antigenic differences suggest that it does not belong to subgroups A or B, and represents a separate subgroup (subgroup C) or possibly a separate serotype.
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Affiliation(s)
- Jane K A Cook
- a Intervet UK , The Elms, Thicket Road, Houghton , Huntingdon , Cambs. , PE17 2BQ , UK
| | - Michael B Huggins
- a Intervet UK , The Elms, Thicket Road, Houghton , Huntingdon , Cambs. , PE17 2BQ , UK
| | - Sarah J Orbell
- a Intervet UK , The Elms, Thicket Road, Houghton , Huntingdon , Cambs. , PE17 2BQ , UK
| | - Dennis A Senne
- b National Veterinary Services Laboratories , P.O. Box 844 , Ames , IA , 50010 , USA
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29
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A. Cook JK, Huggins MB, Orbell SJ, Mawditt K, Cavanagh D. Infectious bronchitis virus vaccine interferes with the replication of avian pneumovirus vaccine in domestic fowl. Avian Pathol 2010; 30:233-42. [DOI: 10.1080/03079450120054640] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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30
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Rubbenstroth D, Dalgaard TS, Kothlow S, Juul-Madsen HR, Rautenschlein S. Effects of cyclosporin A induced T-lymphocyte depletion on the course of avian Metapneumovirus (aMPV) infection in turkeys. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2010; 34:518-529. [PMID: 20043941 DOI: 10.1016/j.dci.2009.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2009] [Revised: 12/22/2009] [Accepted: 12/22/2009] [Indexed: 05/28/2023]
Abstract
The avian Metapneumovirus (aMPV) causes an economically important acute respiratory disease in turkeys (turkey rhinotracheitis, TRT). While antibodies were shown to be insufficient for protection against aMPV-infection, the role of T-lymphocytes in the control of aMPV-infection is not clear. In this study we investigated the role of T-lymphocytes in aMPV-pathogenesis in a T-cell-suppression model in turkeys. T-cell-intact turkeys and turkeys partly depleted of functional CD4(+) and CD8(+) T-lymphocytes by Cyclosporin A (CsA) treatment were inoculated with the virulent aMPV subtype A strain BUT 8544. CsA-treatment resulted in a significant reduction of absolute numbers of circulating CD4(+) and CD8alpha(+) T-lymphocytes by up to 82 and 65%, respectively (P<0.05). Proportions of proliferating T-cells within mitogen-stimulated peripheral blood mononuclear cells were reduced by similar levels in CsA-treated birds compared to untreated controls (P<0.05). CsA-treated turkeys showed delayed recovery from aMPV-induced clinical signs and histopathological lesions and a prolonged detection of aMPV in choanal swabs. The results of this study show that T-lymphocytes play an important role in the control of primary aMPV-infection in turkeys.
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Affiliation(s)
- Dennis Rubbenstroth
- Clinic for Poultry, University of Veterinary Medicine Hannover, Bünteweg 17, Hannover, Germany
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31
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Ongor H, Karahan M, Kalin R, Bulut H, Cetinkaya B. Detection of avian metapneumovirus subtypes in turkeys using RT-PCR. Vet Rec 2010; 166:363-6. [DOI: 10.1136/vr.c1607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
| | | | | | - H. Bulut
- Department of Virology; Faculty of Veterinary Medicine; University of Firat; 23119 Elazig Turkey
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32
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Propagation of avian metapneumovirus subtypes A and B using chicken embryo related and other cell systems. J Virol Methods 2010; 167:1-4. [PMID: 20219543 DOI: 10.1016/j.jviromet.2010.02.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2009] [Revised: 02/15/2010] [Accepted: 02/18/2010] [Indexed: 11/20/2022]
Abstract
Primary isolation of avian metapneumovirus (aMPV) is carried out using tracheal organ culture (TOC) or chicken embryonated eggs with subsequent adaptation in chicken embryo fibroblasts (CEF) or Vero cultures. This study was conducted to evaluate six different cell lines and two avian culture systems for the propagation of aMPV subtypes A and B. The chicken embryo related (CER) cells were used successfully for primary isolation. In addition to Vero and baby hamster kidney (BHK-21) cells, CER cells were also shown to be the most appropriate for propagation of aMPV considering high titres. Propagation of A and B subtypes in CEF and TOC remained efficient after the primary isolation and several passages of viruses in the CER cell line. The growth curves were created using CER, Vero and BHK-21 cell lines. Compared with growth, both yielded higher titres in CER cells during the first 30 h after infection, but no significant difference was observed in the results obtained from CER and Vero cells. This data show that CER cells are adequate for aMPV subtypes A and B propagation, giving similar results to Vero cells.
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33
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Rubbenstroth D, Rautenschlein S. Investigations on the protective role of passively transferred antibodies against avian metapneumovirus infection in turkeys. Avian Pathol 2009; 38:427-36. [DOI: 10.1080/03079450903349204] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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34
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Kapczynski DR, Perkins LL, Sellers HS. Mucosal Vaccination with Formalin-Inactivated Avian Metapneumovirus Subtype C Does Not Protect Turkeys Following Intranasal Challenge. Avian Dis 2008; 52:28-33. [DOI: 10.1637/7821-122706-reg] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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35
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Ganapathy K, Jones RC. Vaccination of Chicks with Live Attenuated Subtype B Avian Metapneumovirus Vaccines: Protection Against Challenge and Immune Responses Can Be Unrelated to Vaccine Dose. Avian Dis 2007; 51:733-7. [DOI: 10.1637/0005-2086(2007)51[733:vocwla]2.0.co;2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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36
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Abstract
Pneumovirus infection remains a significant problem for both human and veterinary medicine. Both avian pneumovirus (aMPV, Turkey rhinotracheitis virus) and human metapneumovirus (hMPV) are pathogens of birds and humans, which are associated with respiratory tract infections. Based on their different genomic organization and low level of nucleotide (nt) and amino acid (aa) identity with paramyxoviruses in the genus Pneumovirus, aMPV and hMPV have been classified into a new genus referred to as Metapneumovirus. The advancement of our understanding of pneumovirus biology and pathogenesis of pneumovirus disease in specific natural hosts can provide us with strategies for vaccine formulations and combined antiviral and immunomodulatory therapies.
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Affiliation(s)
- Shobha Broor
- Department of Microbiology, All India Institute of Medical Sciences Hospital, New Delhi, India.
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37
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Naylor CJ, Ling R, Edworthy N, Savage CE, Easton AJ. Avian metapneumovirus SH gene end and G protein mutations influence the level of protection of live-vaccine candidates. J Gen Virol 2007; 88:1767-1775. [PMID: 17485538 DOI: 10.1099/vir.0.82755-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A prototype avian metapneumovirus (AMPV) vaccine (P20) was previously shown to give variable outcomes in experimental trials. Following plaque purification, three of 12 viruses obtained from P20 failed to induce protection against virulent challenge, whilst the remainder retained their protective capacity. The genome sequences of two protective viruses were identical to the P20 consensus, whereas two non-protective viruses differed only in the SH gene transcription termination signal. Northern blotting showed that the alterations in the SH gene-end region of the non-protective viruses led to enhanced levels of dicistronic mRNA produced by transcriptional readthrough. A synthetic minigenome was used to demonstrate that the altered SH gene-end region reduced the level of protein expression from a downstream gene. The genomes of the remaining eight plaque-purified viruses were sequenced in the region where the P20 consensus sequence differed from the virulent progenitor. The seven protective clones were identical, whereas the non-protective virus retained the virulent progenitor sequence at two positions and contained extensive alterations in its attachment (G) protein sequence associated with a reduced or altered expression pattern of G protein on Western blots. The data indicate that the efficacy of a putative protective vaccine strain is affected by mutations altering the balance of G protein expression.
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MESH Headings
- Animals
- Base Sequence
- Blotting, Northern
- Blotting, Western
- Disease Models, Animal
- Genome, Viral/genetics
- Metapneumovirus/genetics
- Metapneumovirus/immunology
- Metapneumovirus/pathogenicity
- Molecular Sequence Data
- Mutation
- Paramyxoviridae Infections/immunology
- Paramyxoviridae Infections/prevention & control
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- RNA, Viral/biosynthesis
- RNA, Viral/genetics
- Sequence Analysis, DNA
- Transcription, Genetic
- Turkeys
- Viral Proteins/biosynthesis
- Viral Proteins/genetics
- Viral Proteins/immunology
- Viral Vaccines/genetics
- Viral Vaccines/immunology
- Virulence/genetics
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Affiliation(s)
- Clive J Naylor
- Department of Veterinary Pathology, University of Liverpool, Leahurst, Neston, Cheshire, UK
| | - Roger Ling
- Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Nicole Edworthy
- Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Carol E Savage
- Department of Veterinary Pathology, University of Liverpool, Leahurst, Neston, Cheshire, UK
| | - Andrew J Easton
- Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
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38
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Lee EH, Song MS, Shin JY, Lee YM, Kim CJ, Lee YS, Kim H, Choi YK. Genetic characterization of avian metapneumovirus subtype C isolated from pheasants in a live bird market. Virus Res 2007; 128:18-25. [PMID: 17485129 DOI: 10.1016/j.virusres.2007.03.029] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2006] [Revised: 03/29/2007] [Accepted: 03/30/2007] [Indexed: 10/23/2022]
Abstract
Complete nucleotide sequences of two avian metapneumoviruses (aMPV), designated PL-1 and PL-2, were isolated from pheasants, revealing novel sequences of the first aMPV to be fully sequenced in Korea. The complete genome of both PL-1 and PL-2 was composed of 13,170 nucleotides. Phylogenetic analysis revealed that PL-1 belonged to aMPV subtype C, sharing higher homology in deduced amino acid sequence identities with hMPV, rather than with aMPV subtypes A and B. Replication of PL-1 in experimentally re-infected pheasants was confirmed by reverse transcription (RT)-polymerase chain reaction (PCR). Chickens and mice were experimentally inoculated with PL-1 to test the replication potential of PL-1 in other species. Although one specimen from the nasal turbinates of an inoculated chicken showed a slight trace of viral replication at 3 days post-infection (dpi), all of the infected mice were negative for aMPV by RT-PCR throughout the experiment, suggesting that PL-1 does not readily infect mammals. This is the first report of the isolation and complete genomic sequence of aMPV subtype C originating from pheasants.
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Affiliation(s)
- Eun ho Lee
- College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
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39
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Tiwari A, Patnayak DP, Chander Y, Goyal SM. Permissibility of different cell types for the growth of avian metapneumovirus. J Virol Methods 2006; 138:80-4. [PMID: 16930732 DOI: 10.1016/j.jviromet.2006.07.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Revised: 07/17/2006] [Accepted: 07/19/2006] [Indexed: 11/29/2022]
Abstract
Vero cells are commonly used for the growth of avian metapneumovirus subtype C (aMPV-C). This study was conducted to evaluate 17 different cell types for the growth of a Minnesota strain of aMPV-C. The virus was inoculated into these cell types and virus growth was monitored by the development of cytopathic effects (cpe) and immunofluorescence. Virus growth was obtained in 6 of 17 cell types tested with the highest virus titers observed in BGM and DF-1 cells. The flow cytometric analysis of cells at 72 h post inoculation found the highest number of infected cells in BGM cells followed by QT-35 cells. At 48 h post inoculation, DF-1 and BGM cells showed the highest number of infected cells. These results suggest that BGM, QT-35, and DF-1 cells can be used for high titer propagation of aMPV-C.
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Affiliation(s)
- A Tiwari
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, 1333 Gortner Avenue, St. Paul, MN 55108, USA
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40
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Velayudhan BT, Noll SL, Thachil AJ, Shaw DP, Goyal SM, Halvorson DA, Nagaraja KV. Development of a vaccine-challenge model for avian metapneumovirus subtype C in turkeys. Vaccine 2006; 25:1841-7. [PMID: 17229500 DOI: 10.1016/j.vaccine.2006.10.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2005] [Revised: 08/16/2006] [Accepted: 10/20/2006] [Indexed: 10/23/2022]
Abstract
The objective of this study was to evaluate different preparations of avian metapneumovirus (aMPV) subtype C as vaccine challenge in turkeys. Two aMPV isolates and their respective nasal turbinate homogenates after propagation in turkeys were used in the study. Significantly higher clinical sign scores were recorded in birds inoculated with 20 or 2% turbinate homogenate of recent isolate. Birds in the above groups showed more pronounced histopathological lesions, and a higher percentage of birds showed viral RNA and antigen in tissues. The data demonstrated that nasal turbinate homogenate of recent isolate produced severe clinical signs and lesions in turkeys and could be an ideal candidate for vaccine-challenge studies.
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Affiliation(s)
- Binu T Velayudhan
- Department of Veterinary and Biomedical Sciences, University of Minnesota, 1971 Commonwealth Avenue, St. Paul, MN 55108, USA
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41
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Van Loock M, Loots K, Van Heerden M, Vanrompay D, Goddeeris BM. Exacerbation of Chlamydophila psittaci pathogenicity in turkeys superinfected by Escherichia coli. Vet Res 2006; 37:745-55. [PMID: 16973115 DOI: 10.1051/vetres:2006033] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2005] [Accepted: 04/10/2006] [Indexed: 11/14/2022] Open
Abstract
Both Chlamydophila psittaci and Escherichia coli infections are highly prevalent in Belgian turkeys and therefore they both might contribute to the respiratory disease complex observed in turkeys. C. psittaci can infect turkeys within the first week of age, even in the presence of maternal antibodies. However, the first C. psittaci outbreaks occur mostly at the age of 3 to 6 weeks, the period when also E. coli infections appear on the farms. Therefore, we examined in this study the pathogenicity of an E. coli superinfection on C. psittaci predisposed turkeys. Turkeys were infected with C. psittaci, E. coli or with C. psittaci followed by E. coli. Simulating the impact of an E. coli infection during the acute phase or the latent phase of a C. psittaci infection, turkeys received E. coli at 1 or 5 weeks post C. psittaci infection, respectively. E. coli superinfection during the acute phase of C. psittaci infection increased C. psittaci excretion and stimulated chlamydial replication in the respiratory tract resulting in exacerbated clinical disease. Interestingly, E. coli superinfection during the latent phase of C. psittaci infection induced chlamydial replication, leading to increased C. psittaci-specific antibody titres. In addition, chlamydial predisposition gave higher E. coli excretion compared with turkeys that had only been infected with E. coli. Overall, the present study clearly demonstrates the pathogenic interplay between C. psittaci and E. coli resulting in more severe respiratory disease.
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Affiliation(s)
- Marnix Van Loock
- Department of Biosystems, Division of Gene Technology, Catholic University of Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
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42
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Tiwari A, Patnayak DP, Chander Y, Parsad M, Goyal SM. Survival of two avian respiratory viruses on porous and nonporous surfaces. Avian Dis 2006; 50:284-7. [PMID: 16863083 DOI: 10.1637/7453-101205r.1] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The transmission of pathogens from infected to susceptible hosts may occur through contaminated fomites and inanimate objects. This type of transmission depends on the ability of the pathogens to survive in the environment. In this report, we describe the survivability of two avian respiratory viruses, e.g., avian metapneumovirus and avian influenza virus on 12 different porous and nonporous surfaces. The viruses survived on some of the surfaces for up to 6 days postcontamination but not after 9 days. Both viruses survived longer on nonporous surfaces than on porous ones. One of the reasons for poor survival on porous surfaces could be inefficient elution of virus from these surfaces. These results should be helpful in determining how long the premises should be left vacant after an outbreak of these viruses has occurred in poultry houses.
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Affiliation(s)
- A Tiwari
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA
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43
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Yu Q, Estevez CN, Kapczynski DR. Production and Characterization of Monoclonal Antibodies That React to the Nucleocapsid Protein of Avian Metapneumovirus Subtype C. Avian Dis 2006; 50:419-24. [PMID: 17039843 DOI: 10.1637/7513-020606r.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Monoclonal antibodies (MAbs) were prepared against avian metapneumovirus (aMPV) subtype C (aMPV/ Minnesota/turkey/1a/97). Six MAbs were selected based on enzyme-linked immunosorbent assay activities and characterized by isotyping, neutralization test, western blot analysis, and immunohistochemistry assay. The results showed that three MAbs (3E, 9D, and 12C) belonged to the IgG1 subclass, whereas the other three (5D, 8E, and 16E) were of the IgG2a subclass. None of the six MAbs neutralized aMPV infectivity at a detectable level, but all reacted with both denatured and nondenatured forms of the nucleocapsid (N) protein of aMPV, suggesting that these MAbs may recognize structurally independent epitopes of the N protein. These MAbs provide new tools and methods for investigating aMPV infection and pathogenesis, as well as diagnosis of aMPV disease.
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Affiliation(s)
- Qingzhong Yu
- Southeast Poultry Research Laboratory, USDA Agricultural Research Service, 934 College Station Road, Athens, GA 30605, USA
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44
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Tiwari A, Patnayak DP, Goyal SM. Attempts to improve on a challenge model for subtype C avian pneumovirus. Avian Pathol 2006; 35:117-21. [PMID: 16595303 DOI: 10.1080/03079450600597675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Respiratory disease caused by avian pneumovirus (APV) has a strong negative impact on the economy of the turkey industry in many countries. Progress in developing vaccines against this infection in the US has been slow partly because of the lack of a consistent challenge model to conduct vaccine efficacy studies. This study was designed to determine whether in vivo passages of a US isolate of APV, designated subtype C (APV-C), would increase virus virulence, leading to consistent clinical signs in turkeys. Three different experiments were performed. In experiments 1 and 2, a cell culture adapted APV was passaged four times in vivo in turkeys. Following each passage, clinical signs were found to increase in severity. In addition, inoculated birds were found to shed both APV RNA (by reverse transcriptase-polymerase chain reaction) and live virus (by virus isolation) at each passage. The mean antibody titres also increased with each passage. The results of the second experiment were not in complete agreement with those of experiment 1. In the third experiment, APV grown in three different cell lines was inoculated into three groups of turkeys. Clinical signs were observed in inoculated birds and virus could be isolated from all three groups. The results of this preliminary study indicate that in vivo passage of APV-C in birds may increase virus virulence, but the results obtained in experiment 2 suggest that further studies are needed to confirm this.
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Affiliation(s)
- A Tiwari
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, 1333 Gortner Avenue, St Paul, MN 55108, USA
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45
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Velayudhan BT, McComb B, Bennett RS, Lopes VC, Shaw D, Halvorson DA, Nagaraja KV. Emergence of a virulent type C avian metapneumovirus in turkeys in Minnesota. Avian Dis 2006; 49:520-6. [PMID: 16404993 DOI: 10.1637/7388-052805r.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The objectives of the present study were to investigate the pathogenesis of a recent isolate of avian metapneumovirus (aMPV) in turkeys and to evaluate the quantitative distribution of the virus in various tissues during the course of infection. Seventy 2-week-old turkey poults were divided equally into two groups. One group was inoculated with aMPV (MN 19) with a titer of 10(5.5) TCID50 oculonasally. Birds in the second group were maintained as sham-inoculated controls. Birds showed severe clinical signs in the form of copious nasal discharge, swollen sinus, conjunctivitis, and depression from 4 days postinoculation (PI) to 12 days PI. Samples from nasal turbinates, trachea, conjunctiva, Harderian gland, infraorbital sinus, lungs, liver, and spleen were collected at 1, 3, 5, 7, 9, 11, and 14 days PI. Histopathologic lesions such as a multifocal loss of cilia were prominent in nasal turbinate and were seen from 3 to 11 days PI. Immunohistochemistry revealed the presence of aMPV from 3 to 9 days PI in nasal turbinate and trachea. Viral RNA could be detected for 14 days PI from nasal turbinate and for 9 days from trachea. In situ hybridization demonstrated the presence of aMPV from 1 to 11 days PI in nasal turbinates and from 3 to 9 days PI in the trachea. Quantitative real-time polymerase chain reaction data showed the presence of a maximum amount of virus at 3 days PI in nasal turbinate and trachea. Clinically and histopathologically, the new isolate appears to be more virulent compared to the early isolates of aMPV in the United States.
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Affiliation(s)
- Binu T Velayudhan
- Department of Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, MN, USA
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46
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Edworthy NL, Easton AJ. Mutational analysis of the avian pneumovirus conserved transcriptional gene start sequence identifying critical residues. J Gen Virol 2005; 86:3343-3347. [PMID: 16298980 DOI: 10.1099/vir.0.81352-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Seven of the eight genes in the avian pneumovirus (APV) genome contain a conserved 9 nt transcriptional start sequence with the virus large (L) polymerase gene differing from the consensus at three positions. The sequence requirements of the APV transcriptional gene start sequence were investigated by generating a series of mutations in which each of the nine conserved bases was mutated to each of the other three possible nucleotides in a minigenome containing two reporter genes. The effect of each mutation was assessed by measuring the relative levels of expression from the altered and unaltered gene start sequences. Mutations at positions 2, 7 and 9 significantly reduced transcription levels while alterations to position 5 had little effect. The L gene start sequence directed transcription at levels approximately 50 % below that of the consensus gene start sequence. These data suggest that there are common features in pneumovirus transcriptional control sequences.
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Affiliation(s)
- Nicole L Edworthy
- Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Andrew J Easton
- Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
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47
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Luo L, Sabara MI, Li Y. Expression of recombinant small hydrophobic protein for serospecific detection of avian pneumovirus subgroup C. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2005; 12:187-91. [PMID: 15643005 PMCID: PMC540199 DOI: 10.1128/cdli.12.1.187-191.2005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The small hydrophobic (SH) gene of the avian pneumovirus (APV) Colorado isolate (CO), which belongs to subgroup C (APV/C), was expressed with a baculovirus vector. The recombinant SH protein was evaluated as a potential subgroup-specific diagnostic reagent in order to differentiate infections resulting from APV/C from those induced by APV/A, APV/B, and human metapneumovirus (hMPV). When the recombinant baculovirus was used to infect insect cells, a 31- to 38-kDa glycosylated form of the SH protein was produced and subsequently tested for reactivity with antibodies specific for APV/A, APV/B, APV/C, and hMPV. Western blot analysis showed that the expressed recombinant SH protein could only be recognized by APV/C-specific antibodies. This result was consistent with sequence analysis of the APV/C SH protein, which had very low (24%) amino acid identity with the corresponding protein of hMPV and no discernible identity with the SH protein of APV/A or APV/B. A recombinant SH protein-based enzyme-linked immunosorbent assay (ELISA) was developed, and it further confirmed the lack of reactivity of this protein with antisera raised to APV/A, APV/B, and hMPV and supported its designation as a subgroup-specific antigen. This finding indicated that the recombinant SH protein was a suitable antigen for ELISA-based detection of subgroup-specific antibodies in turkeys and could be used for serologically based differential diagnosis of APV and hMPV infections.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antibodies, Viral/blood
- Antibodies, Viral/immunology
- Antibody Specificity/immunology
- Antigens, Viral/biosynthesis
- Antigens, Viral/genetics
- Antigens, Viral/immunology
- Blotting, Western
- Enzyme-Linked Immunosorbent Assay
- Genetic Variation
- Humans
- Metapneumovirus/genetics
- Metapneumovirus/immunology
- Molecular Sequence Data
- Paramyxoviridae Infections/diagnosis
- Paramyxoviridae Infections/immunology
- Paramyxoviridae Infections/veterinary
- Poultry Diseases/diagnosis
- Poultry Diseases/immunology
- Poultry Diseases/virology
- Recombinant Proteins/biosynthesis
- Recombinant Proteins/genetics
- Recombinant Proteins/immunology
- Retroviridae Proteins, Oncogenic/biosynthesis
- Retroviridae Proteins, Oncogenic/genetics
- Retroviridae Proteins, Oncogenic/immunology
- Sequence Homology, Amino Acid
- Serologic Tests
- Turkeys/virology
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Affiliation(s)
- Lizhong Luo
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, Manitoba R3E 3M4, Canada.
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48
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Alvarez R, Seal BS. Identification of a truncated nucleoprotein in avian metapneumovirus-infected cells encoded by a second AUG, in-frame to the full-length gene. Virol J 2005; 2:31. [PMID: 15826312 PMCID: PMC1087890 DOI: 10.1186/1743-422x-2-31] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Accepted: 04/12/2005] [Indexed: 11/16/2022] Open
Abstract
Background Avian metapneumoviruses (aMPV) cause an upper respiratory disease with low mortality, but high morbidity primarily in commercial turkeys. There are three types of aMPV (A, B, C) of which the C type is found only in the United States. Viruses related to aMPV include human, bovine, ovine, and caprine respiratory syncytial viruses and pneumonia virus of mice, as well as the recently identified human metapneumovirus (hMPV). The aMPV and hMPV have become the type viruses of a new genus within the Metapneumovirus. The aMPV nucleoprotein (N) amino acid sequences of serotypes A, B, and C were aligned for comparative analysis. Based on predicted antigenicity of consensus protein sequences, five aMPV-specific N peptides were synthesized for development of peptide-antigens and antisera. Results The presence of two aMPV nucleoprotein (N) gene encoded polypeptides was detected in aMPV/C/US/Co and aMPV/A/UK/3b infected Vero cells. Nucleoprotein 1 (N1) encoded from the first open reading frame (ORF) was predicted to be 394 amino acids in length for aMPV/C/US/Co and 391 amino acids in length for aMPV/A/UK/3b with approximate molecular weights of 43.3 kilodaltons and 42.7 kilodaltons, respectively. Nucleoprotein 2 (N2) was hypothesized to be encoded by a second downstream ORF in-frame with ORF1 and encoded a protein predicted to contain 328 amino acids for aMPV/C/US/Co or 259 amino acids for aMPV/A/UK/3b with approximate molecular weights of 36 kilodaltons and 28.3 kilodaltons, respectively. Peptide antibodies to the N-terminal and C-terminal portions of the aMPV N protein confirmed presence of these products in both aMPV/C/US/Co- and aMPV/A/UK/3b-infected Vero cells. N1 and N2 for aMPV/C/US/Co ORFs were molecularly cloned and expressed in Vero cells utilizing eukaryotic expression vectors to confirm identity of the aMPV encoded proteins. Conclusion This is the first reported identification of potential, accessory in-frame N2 ORF gene products among members of the Paramyxoviridae. Genomic sequence analyses of related members of the Pneumovirinae other than aMPV, including human respiratory syncytial virus and bovine respiratory syncytial virus demonstrated the presence of this second potential ORF among these agents.
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Affiliation(s)
- Rene Alvarez
- Southeast Poultry Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA 30605, USA
- Present address: Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30605, USA
| | - Bruce S Seal
- Southeast Poultry Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA 30605, USA
- Poultry Microbiological Safety Research Unit, ARS, USDA, 950 College Station Rd., Athens, GA 30605, USA
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Patnayak DP, Tiwari A, Goyal SM. Growth of vaccine strains of avian pneumovirus in different cell lines. Avian Pathol 2005; 34:123-6. [PMID: 16191692 DOI: 10.1080/03079450500059214] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The isolation of avian pneumovirus (APV) (avian metapneumovirus) is usually performed in embryonated chicken eggs or chicken embryo fibroblast cell cultures followed by adaptation in continuous cell lines such as Vero cells. This study was conducted to find a suitable cell line that could be used to propagate vaccine strains of APV to high titre. For this purpose, we compared the growth of two Vero cell-adapted vaccine strains of APV (P63 and ca-APV) in seven different cell types with their growth in Vero cells. The cell types used were BGM-70, MA-104, QT-35, BHK-21, McCoy and DF-1 cells and primary turkey embryo fibroblast cells. When compared with growth in Vero cells, both viruses yielded higher titres in BGM-70 cells, while P63 also produced higher titres in MA-104 cells. In another experiment, the two viruses were grown and titrated in Vero cells under various cell culture conditions, such as age of cells, seeding concentration, and time of harvest. None of these cell culture variables were found to affect virus titres.
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Affiliation(s)
- Devi P Patnayak
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA
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Maherchandani S, Muñoz-Zanzi CA, Patnayak DP, Malik YS, Goyal SM. The effect of pooling sera on the detection of avian pneumovirus antibodies using an enzyme-linked immunosorbent assay test. J Vet Diagn Invest 2005; 16:497-502. [PMID: 15586563 DOI: 10.1177/104063870401600602] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Pooling of samples is a cost-effective approach to estimate disease prevalence and to identify infected individuals. The objective of this study was to evaluate the use of serum pools for the detection of avian pneumovirus infection in turkey flocks by enzyme-linked immunosorbent assay, so that a minimum number of tests can be performed without compromising the sensitivity and specificity of the test. A total of 900 field samples were tested; 20 samples from each of 45 flocks. All samples were tested individually followed by pool testing in groups of 3, 4, 5, and 7 samples each. The number of positive pools for a given pool size was positively associated with the number of positive samples. In a separate experiment, the effect of dilution was examined by pooling 1 positive sample with different numbers of negative samples to form pools of sizes 2-7. These laboratory results were analyzed and integrated into a simulation model aimed at evaluating cost-efficient testing procedures. The probability of detecting an infected flock depended on prevalence of infection, size of serum pool, and the cutoff value used for optical density difference. At a theoretical prevalence of 20%, the probability of detecting an infected flock was 0.93 and 0.86 for a pool of 2 and 7, respectively. The probability of detecting positive flocks increased with increased prevalence and decreased cutoff. Pooling of samples represented a significant reduction in the cost of testing, suggesting that pooling is more advantageous and cost effective than testing individual samples.
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Affiliation(s)
- Sunil Maherchandani
- Departments of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA
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