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Salles GBC, Pilati GVT, Muniz EC, de Lima Neto AJ, Vogt JR, Dahmer M, Savi BP, Padilha DA, Fongaro G. Trends and Challenges in the Surveillance and Control of Avian Metapneumovirus. Viruses 2023; 15:1960. [PMID: 37766366 PMCID: PMC10535940 DOI: 10.3390/v15091960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/09/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Among the respiratory pathogens of birds, the Avian Metapneumovirus (aMPV) is one of the most relevant, as it is responsible for causing infections of the upper respiratory tract and may induce respiratory syndromes. aMPV is capable of affecting the reproductive system of birds, directly impacting shell quality and decreasing egg production. Consequently, this infection can cause disorders related to animal welfare and zootechnical losses. The first cases of respiratory syndromes caused by aMPV were described in the 1970s, and today six subtypes (A, B, C, D, and two more new subtypes) have been identified and are widespread in all chicken and turkey-producing countries in the world, causing enormous economic losses for the poultry industry. Conventionally, immunological techniques are used to demonstrate aMPV infection in poultry, however, the identification of aMPV through molecular techniques helped in establishing the traceability of the virus. This review compiles data on the main aMPV subtypes present in different countries; aMPV and bacteria co-infection; vaccination against aMPV and viral selective pressure, highlighting the strategies used to prevent and control respiratory disease; and addresses tools for viral diagnosis and virus genome studies aiming at improving and streamlining pathogen detection and corroborating the development of new vaccines that can effectively protect herds, preventing viral escapes.
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Affiliation(s)
- Gleidson Biasi Carvalho Salles
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
- Zoetis Industry of Veterinary Products LTDA, São Paulo 04709-111, Brazil; (E.C.M.); (J.R.V.)
| | - Giulia Von Tönnemann Pilati
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
| | - Eduardo Correa Muniz
- Zoetis Industry of Veterinary Products LTDA, São Paulo 04709-111, Brazil; (E.C.M.); (J.R.V.)
| | | | - Josias Rodrigo Vogt
- Zoetis Industry of Veterinary Products LTDA, São Paulo 04709-111, Brazil; (E.C.M.); (J.R.V.)
| | - Mariane Dahmer
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
| | - Beatriz Pereira Savi
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
| | - Dayane Azevedo Padilha
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
| | - Gislaine Fongaro
- Laboratory of Applied Virology, Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil; (G.B.C.S.); (G.V.T.P.); (M.D.); (B.P.S.); (D.A.P.)
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Lupini C, Tucciarone CM, Mescolini G, Quaglia G, Graziosi G, Turblin V, Brown P, Cecchinato M, Legnardi M, Delquigny T, Lemiere S, Perreul G, Catelli E. Longitudinal Survey on aMPV Circulation in French Broiler Flocks following Different Vaccination Strategies. Animals (Basel) 2022; 13:ani13010057. [PMID: 36611670 PMCID: PMC9817960 DOI: 10.3390/ani13010057] [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: 11/11/2022] [Revised: 12/04/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
In recent years, the impact of respiratory disease resulting from Avian Metapneumovirus (aMPV) infection has been generally rising in the broiler industry in Europe. In this context, in order to investigate aMPV contribution to the clinical picture and the potential benefits of diversified vaccination strategies compared to nonvaccination policies, a longitudinal monitoring was performed, also evaluating Infectious Bronchitis Virus (IBV) presence. Broiler flocks located in Western France, where aMPV has already proven to be a health and productivity issue, were screened by RT-PCR on rhino-pharyngeal swabs, and the viruses were genetically characterized by sequence analysis. For a more comprehensive picture of aMPV molecular epidemiology and evolution in France, aMPV subtype B strains detected from 1985 to 1998 were sequenced and included in the analysis. The survey confirmed the detection of aMPV subtype B in commercial broiler flocks in France, together with a certain heterogeneity demonstrated by the circulation of more recent and historical French field strains. No IBV field strains were detected. The implementation and evaluation of different management choices and vaccine strategies suggests once again that immunization does not prevent infection but contributes greatly to the containment of the clinical manifestations.
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Affiliation(s)
- Caterina Lupini
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, BO, Italy
- Correspondence:
| | - Claudia Maria Tucciarone
- Department of Animal Medicine, Production and Health, University of Padua, 35020 Legnaro, PD, Italy
| | - Giulia Mescolini
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, BO, Italy
| | - Giulia Quaglia
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, BO, Italy
| | - Giulia Graziosi
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, BO, Italy
| | - Vincent Turblin
- MC VET Conseil—RESEAU CRISTAL, 72300 Sablé sur Sarthe, France
| | - Paul Brown
- Laboratoire de Ploufragan-Plouzané-Niort, Agence Nationale de Sécurité Sanitairede l’alimentation, de l’environnement et du Travail, B.P., 53-22440 Ploufragan, France
| | - 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
| | | | | | | | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, BO, Italy
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Kaboudi K, Lachheb J. Avian metapneumovirus infection in turkeys: a review on turkey rhinotracheitis. J APPL POULTRY RES 2021. [DOI: 10.1016/j.japr.2021.100211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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The influence of maternally derived antibodies on protection against aMPV/A infection in TRT vaccinated turkeys. Poult Sci 2021; 100:101086. [PMID: 33812280 PMCID: PMC8053802 DOI: 10.1016/j.psj.2021.101086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/22/2021] [Accepted: 02/23/2021] [Indexed: 11/20/2022] Open
Abstract
Avian metapneumoviruses (aMPV) are a causative agent of turkey rhinotracheitis (TRT). Despite vaccination, cases of TRT outbreaks are frequently reported. Considering that there are aMPV-free areas, a part of turkey poults possess (MDA+) or do not possess (MDA-) maternally derived antibodies (MDA) in the first weeks of life, which is the time of TRT vaccination. Study was undertaken to establish the level of protection against homologue aMPV/A infection, in MDA+ and MDA- turkeys, vaccinated against TRT at the 0 or 14th d of life and infected 14 d later. With the use of ELISA test and qPCR techniques, we have established the level of immune system stimulation after the vaccination and how does it correlate with the level of protection against the aMPV infection. Vaccination of MDA+ turkeys (especially at 0 d of life) resulted in weaker IgA production in upper respiratory tract. In addition, we have demonstrated differences in both humoral and cell-mediated immunity stimulation after infection of vaccinated turkeys. Despite these differences, we have shown that all vaccinated birds were protected against the disease which was determined based on the clinical and histopathological scoring, as well as the level of aMPV/A replication and shedding. Nonvaccinated groups of turkeys displayed typical signs of TRT after infection which indicates that MDA alone are incapable of preventing the disease. Differences in TRT course were recorded between different age groups of nonvaccinated birds. Birds infected at the 28th d of life (especially MDA- birds) developed more severe signs, and the level of aMPV replication was higher than that in birds infected on the 14th d of life. Despite the minor role in alleviating TRT course, MDA seems not to interfere with the vaccination efficacy. It is hard to predict whether the observed immune system stimulation differences between MDA+ and MDA- birds after vaccination can influence the outcome of vaccination efficacy under the field conditions.
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Mescolini G, Lupini C, Franzo G, Quaglia G, Legnardi M, Cecchinato M, Tucciarone CM, Blanco A, Turblin V, Biarnés M, Tatone F, Falchieri M, Catelli E. What is new on molecular characteristics of Avian metapneumovirus strains circulating in Europe? Transbound Emerg Dis 2020; 68:1314-1322. [PMID: 32794302 DOI: 10.1111/tbed.13788] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 08/10/2020] [Accepted: 08/10/2020] [Indexed: 12/25/2022]
Abstract
In the present study, one hundred and sixteen partial G gene sequences of Avian metapneumovirus (aMPV) subtype B, obtained during routine diagnostics in different European Countries in the last few years (2014-2019), were analysed by sequence and phylogenetic analyses in order to draw an updated picture of the molecular characteristics of circulating strains. Nucleotide sequences were compared with other sequences of European and non-European aMPV-Bs collected prior to that period or retrieved from GenBank. Phylogenetic relationships among the aMPV-B strains, reconstructed using the maximum likelihood method implemented in MEGA X, demonstrated that aMPV-B has evolved in Europe from its first appearance, frequently displaying a clear relation with the geographic area of detection. The 40% of aMPV-B viruses analysed were classified as vaccine-derived strains, being phylogenetically related, and showing high nucleotide identity with live commercial vaccine strains licensed in Europe. The remaining 60% were classified as field strains since they clustered separately and showed a low nucleotide identity with vaccines and vaccine-derived strains. The phylogenetic tree showed that the virus has continued to evolve from its first appearance in the '80s since more recently detected strains belonged to clades phylogenetically distant from the older strains. Unlike vaccine-derived strains, field strains tended to cluster according to their geographic origin and irrespective of the host species where the viruses had been detected. In conclusion, the molecular characterization of aMPV-B and the differentiation between vaccines and field strains through G gene sequence analysis can be a useful tool towards correct diagnosis and should be routinely applied in order to better address the control strategies.
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Affiliation(s)
- 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
| | - Giovanni Franzo
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, Italy
| | - Giulia Quaglia
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia (BO), Italy
| | - Matteo Legnardi
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, Italy
| | - Mattia Cecchinato
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, Italy
| | - Claudia M Tucciarone
- Department of Animal Medicine, Production and Health, University of Padua, Legnaro, Italy
| | - Angela Blanco
- CESAC - Centre de Sanitat Avícola de Catalunya i Aragó, Reus, Spain
| | | | - Mar Biarnés
- CESAC - Centre de Sanitat Avícola de Catalunya i Aragó, Reus, Spain
| | | | | | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia (BO), Italy
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IFNγ Production Profile in Turkeys of Different Immunological Status after TRT Vaccination. J Vet Res 2020; 64:239-245. [PMID: 32587910 PMCID: PMC7305653 DOI: 10.2478/jvetres-2020-0040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 05/18/2020] [Indexed: 11/20/2022] Open
Abstract
Introduction Despite vaccination against avian metapneumoviruses (aMPV), cases of turkey rhinotracheitis (TRT) caused by aMPV field strains are frequently reported. Differences have been shown in the level of immune system stimulation after aMPV vaccination between turkeys that do and do not possess specific anti-aMPV maternally derived antibodies (MDA). The article describes the influence of MDA on the production of IFNγ in the spleen of aMPV-vaccinated turkeys. Material and Methods MDA+ or MDA- turkeys were vaccinated against TRT after hatching or on the 14th day of life. Spleen samples were collected 3, 7, and 14 days post vaccination for mononuclear cell isolation. Real-time PCR, flow cytometry, and the enzyme-linked immunospot assay were used to evaluate the levels of IFNγ gene expression, production, and secretion by cells within the spleen samples. Results Increased IFNγ gene expression was noticed after vaccination only in birds that did not possess MDA or possessed MDA at relatively low level (MDA+ birds vaccinated at 14 DOL). In all birds, an increased percentage of T lymphocytes producing IFNγ was recorded. The proportion of anti-aMPV IFNγ-secreting cells was increased only in MDA- birds. Conclusion Besides having a protective role, MDA are known to interfere with vaccination efficacy. The analysis of our results confirms that MDA can decrease the level of immune system stimulation after aMPV vaccination of turkeys.
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Laconi A, Catelli E, Cecchinato M, Naylor CJ. Two similar commercial live attenuated AMPV vaccines prepared by random passage of the identical field isolate, have unrelated sequences. Vaccine 2019; 37:2765-2767. [PMID: 31003913 DOI: 10.1016/j.vaccine.2019.04.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 04/08/2019] [Accepted: 04/12/2019] [Indexed: 11/20/2022]
Abstract
Since late '80 s Avian metapneumovirus subtype A causes sufficient disease in Europe for commercial companies to have started developing live attenuated vaccines. Here, two of those vaccines were fully consensus sequenced alongside their progenitor field strain (#8544). Sequences comparison shows that the attenuation of field strain #8544 was associated with no common substitutions between the two derived vaccines. This finding suggests that the attenuation of field viruses via serial passage on cell cultures or tissues is the result of a random process, rather than a mechanism aiming to achieve a specific sequence. Furthermore, field vaccination strategies would greatly benefit by the unambiguous vaccine markers identified in this study, enabling a prompt and confident vaccines detection.
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Affiliation(s)
- Andrea Laconi
- Department of Infection Biology, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, United Kingdom.
| | - Elena Catelli
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano dell'Emilia, BO, Italy
| | - Mattia Cecchinato
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università, 16, 35020 Legnaro, PD, Italy
| | - Clive J Naylor
- Department of Infection Biology, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, United Kingdom
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Chen Y, Cai S, Jian J. Protection against Vibrio alginolyticus in pearl gentian grouper (♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatu) immunized with an acfA-deletion live attenuated vaccine. FISH & SHELLFISH IMMUNOLOGY 2019; 86:875-881. [PMID: 30572128 DOI: 10.1016/j.fsi.2018.12.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 12/10/2018] [Accepted: 12/15/2018] [Indexed: 06/09/2023]
Abstract
Vibrio alginolyticus is well-known as an opportunistic Gram-negative pathogen, which endangers the development of global aquaculture as well as human health. In this study, a ΔacfA mutant strain and complementation of the ΔacfA mutant (C-acfA) were constructed. The ΔacfA mutant was tested in pearl gentian grouper (♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatu) to observe the changes in virulence and evaluate its potential as an attenuated live vaccine. The results showed that the ΔacfA mutant caused a high antibody titer and a significant reduction in the ability to colonize the intestine of pearl gentian grouper. Grouper vaccinated with ΔacfA mutant were more tolerant of the infection by virulent V. alginolyticus HY9901 without inducing clinical symptoms and obvious pathological changes. The relative percent survival value of pearl gentian grouper vaccinated with ΔacfA mutant intraperitoneal injection reached 81.1% after challenging with V. alginolyticus HY9901. The specific antibody titers immunized with ΔacfA was significantly higher than that in the PBS group. The antibody titer of ΔacfA group displayed the tendency of rising up from the first to fourth week and declining from fifth to eighth week and reached the peak at the fourth week. In the meanwhile, the expression level of genes associated with immunity, including IL-1β, TNF-α, IL-16, IgM, CD8α and MHC-Iα, was up-regulated after vaccination, indicating that the ΔacfA can induce effective and durable immune response in pearl gentian grouper and it may be an effective attenuated live vaccine candidate for the prevention of infections by V. alginolyticus.
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Affiliation(s)
- Yanyan Chen
- Fisheries College of Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals & Key Laboratory of Control for Diseases of Aquatic Economic Animals of Guangdong Higher Education Institutes, Zhanjiang, China
| | - Shuanghu Cai
- Fisheries College of Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals & Key Laboratory of Control for Diseases of Aquatic Economic Animals of Guangdong Higher Education Institutes, Zhanjiang, China.
| | - Jichang Jian
- Fisheries College of Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals & Key Laboratory of Control for Diseases of Aquatic Economic Animals of Guangdong Higher Education Institutes, Zhanjiang, China.
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Engineered Newcastle disease virus expressing the F and G proteins of AMPV-C confers protection against challenges in turkeys. Sci Rep 2017. [PMID: 28642611 PMCID: PMC5481403 DOI: 10.1038/s41598-017-04267-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Avian metapneumovirus (AMPV) infects the respiratory and reproductive tracts of domestic poultry, resulting in substantial economic losses for producers. Live attenuated vaccines appear to be the most effective in countries where the disease is prevalent. However, reversion to virulence has been demonstrated in several studies. Therefore, the development of a stable and safe next generation vaccine against the AMPV disease is needed. In the present study, we generated a recombinant Newcastle disease virus (NDV) vectoring the fusion (F) protein and glycoprotein (G) genes of AMPV subtype-C (AMPV-C) as a bivalent vaccine candidate using reverse genetics technology. The recombinant virus, rLS/AMPV-C F&G, was slightly attenuated in vivo, yet maintained similar characteristics in vitro when compared to the parental LaSota virus. Vaccination of turkeys with rLS/AMPV-C F&G induced both AMPV-C and NDV-specific antibody responses, and provided significant protection against pathogenic AMPV-C challenge and complete protection against velogenic NDV challenge. These results suggest that the rLS/AMPV-C F&G recombinant virus is a safe and effective bivalent vaccine candidate and that the expression of both F and G proteins of AMPV-C induces a protective response against the AMPV-C disease.
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Ball C, Bennett S, Forrester A, Ganapathy K. Genetic mutations in live infectious bronchitis vaccine viruses following single or dual in vitro infection of tracheal organ cultures. J Gen Virol 2016; 97:3232-3237. [PMID: 27902312 DOI: 10.1099/jgv.0.000628] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Despite regular co-vaccination of two different strains of live infectious bronchitis vaccine viruses, little is known about possible mutations in these viruses following vaccination. As an alternative to chicks, this study used an in vitro infection model to identify single-nucleotide polymorphisms (SNPs) within the part-S1 gene of two live infectious bronchitis virus vaccine strains (793B and Massachusetts) following single or dual inoculation onto tracheal organ cultures. Results indicate that viral titres reduced over the duration of the study; conversely, the amount of detected infectious bronchitis virus genome increased. Results demonstrate a greater number of non-synonymous SNPs in both vaccine strains when they are co-inoculated, compared with the single inoculations. The influence of the increased SNP and hydrophobic properties of the translated proteins on the vaccine viruses' virulence is unknown.
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Affiliation(s)
- Christopher Ball
- Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK
| | - Sarah Bennett
- Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK
| | - Anne Forrester
- Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK
| | - Kannan Ganapathy
- Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK
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Smialek M, Pestka D, Tykalowski B, Stenzel T, Koncicki A. Development of vaccine-induced immunity against TRT in turkeys depends remarkably on the level of maternal antibodies and the age of birds on the day of vaccination. BMC Vet Res 2015; 11:28. [PMID: 25889279 PMCID: PMC4326515 DOI: 10.1186/s12917-015-0345-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 01/30/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Avian Metapneumovirus (aMPV) infections are a huge economical issue for the poultry industry worldwide. Although maternal antibodies do not protect turkey poults against turkey rhinotracheitis (TRT), almost no studies have been conducted so far regarding the impact of these antibodies on vaccine induced immunity development against aMPV infection. We conducted four experiments on commercial turkeys aimed at comparing local humoral and cell mediated immune response of maternally delivered anti-aMPV antibody positive (MDA+; Experiment I and II) and negative (MDA-; Experiment III and IV) turkeys following vaccination with an attenuated live aMPV subtype A vaccine at the day of hatch (Experiment I and III) or at two weeks of age (Experiment II and IV). RESULTS Regardless of the birds' age, vaccination of MDA- turkeys resulted in strong stimulation of CD8(+) T lymphocytes in the Harderian gland and tracheal mucosa, whereas vaccination of MDA+ birds stimulated mainly CD4(+) T cells in those structures. An increase in the level of anti-aMPV IgY antibodies was noted in the serum (but not in tracheal washings) as early as 7 days after vaccination, but only in birds possessing low levels (MDA+ birds vaccinated at 2 weeks of age) or no maternal anti-aMPV antibodies at the time of vaccination. In MDA+ turkeys vaccinated at hatch, the decrease in serum levels of maternal anti-aMPV antibodies proceeded faster (in comparison to control group), which, together with faster viral clearance, indicates that maternal antibodies can inhibit vaccine virus replication and influence the development of vaccine-induced immunity. CONCLUSION This study provides the first documented evidence that the frequency of TRT outbreaks in the field and/or failure of TRT vaccination could be correlated with differences in the immunological status and/or age of vaccinated turkeys.
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Affiliation(s)
- Marcin Smialek
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13/14, 10-719, Olsztyn, Poland.
| | - Daria Pestka
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13/14, 10-719, Olsztyn, Poland.
| | - Bartlomiej Tykalowski
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13/14, 10-719, Olsztyn, Poland.
| | - Tomasz Stenzel
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13/14, 10-719, Olsztyn, Poland.
| | - Andrzej Koncicki
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13/14, 10-719, Olsztyn, Poland.
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Avian metapneumoviruses expressing Infectious Bronchitis virus genes are stable and induce protection. Vaccine 2013; 31:2565-71. [PMID: 23588091 PMCID: PMC7127184 DOI: 10.1016/j.vaccine.2013.03.055] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 02/14/2013] [Accepted: 03/28/2013] [Indexed: 11/24/2022]
Abstract
Foreign viral genes can be inserted into the AMPV genome. Resultant recombinant viruses express the inserted genes and are stable in cell culture. Both S1 and N genes from IBX QX induced protection against QX challenge. Induced seroconversion after recombinant inoculation was minimal.
The study investigates the ability of subtype A Avian metapneumovirus (AMPV) to accept foreign genes and be used as a vector for delivery of Infectious bronchitis virus (IBV) QX genes to chickens. Initially the GFP gene was added to AMPV at all gene junctions in conjunction with the development of cassetted full length DNA AMPV copies. After recombinant virus had been recovered by reverse genetics, GFP positions supporting gene expression while maintaining virus viability in vitro, were determined. Subsequently, either S1 or nucleocapsid (N) genes of IBV were positioned between AMPV M and F genes, while later a bivalent recombinant was prepared by inserting S1 and N at AMPV MF and GL junctions respectively. Immunofluorescent antibody staining showed that all recombinants expressed the inserted IBV genes in vitro and furthermore, all recombinant viruses were found to be highly stable during serial passage. Eyedrop inoculation of chickens with some AMPV-IBV recombinants at one-day-old induced protection against virulent IBV QX challenge 3 weeks later, as assessed by greater motility of tracheal cilia from chickens receiving the recombinants. Nonetheless evidence of AMPV/IBV seroconversion, or major recombinant tracheal replication, were largely absent.
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Cha RM, Yu Q, Zsak L. The pathogenicity of avian metapneumovirus subtype C wild bird isolates in domestic turkeys. Virol J 2013; 10:38. [PMID: 23363433 PMCID: PMC3564841 DOI: 10.1186/1743-422x-10-38] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 01/25/2013] [Indexed: 12/12/2022] Open
Abstract
Background Avian metapneumovirus subtype C (aMPV/C) causes severe upper respiratory disease in turkeys. Previous report revealed the presence of aMPV/C in wild birds in the southeast regions of the U.S. Methods In this study, aMPV/C positive oral swabs from American coots (AC) and Canada geese (CG) were passaged three times in the respiratory tract of specific pathogen free (SPF) turkeys and used as aMPV/C P3 virus isolates in subsequent studies. Results Wild bird P3 isolates showed similar growth characteristics when compared to virulent aMPV/C in chicken embryo fibroblast ( CEF) cell cultures and their glycoprotein G gene sequence was closely related to the G gene of aMPV/C Colorado reference virus. Three-day-old commercial or SPF turkeys were inoculated oculonasally with wild bird aMPV/C P3 isolates. At 5 and 7 days post-inoculation (DPI), severe clinical signs were observed in both of the AC and CG virus-exposed groups. Viral RNA was detected in tracheal swabs by reverse transcriptase polymerase chain reaction (RT-PCR). In addition, immunohistochemistry showed virus replication in the nasal turbinate and trachea. All virus-exposed turkeys developed positive antibody response by 14 DPI. Conclusions Our data demonstrate that aMPV/C wild bird isolates induced typical aMPV/C disease in the domestic turkeys.
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Affiliation(s)
- Ra Mi Cha
- Southeast Poultry Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 934 College Station Road, Athens, GA 30605, USA
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Yu Q, Roth JP, Hu H, Estevez CN, Zhao W, Zsak L. Protection by Recombinant Newcastle Disease Viruses (NDV) Expressing the Glycoprotein (G) of Avian Metapneumovirus (aMPV) Subtype A or B against Challenge with Virulent NDV and aMPV. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/wjv.2013.34018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Hu H, Roth JP, Estevez CN, Zsak L, Liu B, Yu Q. Generation and evaluation of a recombinant Newcastle disease virus expressing the glycoprotein (G) of avian metapneumovirus subgroup C as a bivalent vaccine in turkeys. Vaccine 2011; 29:8624-33. [DOI: 10.1016/j.vaccine.2011.09.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 08/19/2011] [Accepted: 09/02/2011] [Indexed: 11/15/2022]
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16
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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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Brown PA, Lupini C, Catelli E, Clubbe J, Ricchizzi E, Naylor CJ. A single polymerase (L) mutation in avian metapneumovirus increased virulence and partially maintained virus viability at an elevated temperature. J Gen Virol 2010; 92:346-54. [DOI: 10.1099/vir.0.026740-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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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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19
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Charged amino acids in the AMPV fusion protein have more influence on induced protection than deletion of the SH or G genes. Vaccine 2010; 28:6800-7. [DOI: 10.1016/j.vaccine.2010.07.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 06/08/2010] [Accepted: 07/07/2010] [Indexed: 11/22/2022]
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20
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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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21
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Khehra RS, Jones RC. In vitroandin vivostudies on the pathogenicity of avian pneumovirus for the chicken oviduct. Avian Pathol 2010; 28:257-62. [DOI: 10.1080/03079459994740] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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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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23
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Ganapathy K, Bufton A, Pearson A, Lemiere S, Jones RC. Vaccination of commercial broiler chicks against avian metapneumovirus infection: a comparison of drinking-water, spray and oculo-oral delivery methods. Vaccine 2010; 28:3944-8. [DOI: 10.1016/j.vaccine.2010.03.065] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 03/24/2010] [Accepted: 03/26/2010] [Indexed: 11/29/2022]
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24
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Catelli E, Lupini C, Cecchinato M, Ricchizzi E, Brown P, Naylor CJ. Field avian Metapneumovirus evolution avoiding vaccine induced immunity. Vaccine 2010; 28:916-21. [DOI: 10.1016/j.vaccine.2009.10.149] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Revised: 10/22/2009] [Accepted: 10/30/2009] [Indexed: 11/16/2022]
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25
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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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26
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Identification of two regions within the subtype A avian metapneumovirus fusion protein (amino acids 211-310 and 336-479) recognized by neutralizing antibodies. Virus Res 2009; 146:13-8. [PMID: 19720091 DOI: 10.1016/j.virusres.2009.08.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 08/18/2009] [Accepted: 08/21/2009] [Indexed: 11/20/2022]
Abstract
The fusion (F) protein of a subtype A AMPV was expressed in sections in Escherichia coli. Six genome sections were selected which encoded the majority of the protein. These were cloned then expressed from a His tag expression plasmid and, following purification on nickel columns, identities were confirmed by Western blot analysis. The interactions of each fragment with AMPV neutralizing antisera were determined. Purified fragments were mixed with AMPV sera raised against A-C subtypes by a natural route, in order to determine any reduction in their neutralizing capacities. Two fragments covering regions of the F ectodomain reduced neutralizing capacities of both subtype A and B antisera to a highly significant degree (p<0.001) while no effects were seen with subtype C antiserum. Previous studies of similar viruses had identified neutralization as being associated with equivalent F regions. Findings are likely to be useful in guiding future vaccine design.
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27
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Williams RA, Savage CE, Worthington KJ, Jones RC. Further studies on the development of a live attenuated vaccine against turkey rhinotracheitis. Avian Pathol 2008; 20:585-96. [PMID: 18680056 DOI: 10.1080/03079459108418798] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Turkey rhinotracheitis (TRT) virus attenuated by passaging in Vero cells was tested at two different passage levels (15 or 25 passages) and two dose levels [10(3) or 10(4) TCID50 (50% tissue culture infectious doses) per bird] to determine the efficacy in protecting turkey poults against experimental challenge with virulent TRT virus. Following administration by the eyedrop route at 10 days of age, all four preparations proved successful in providing protection against clinical disease and establishment of challenge virus in the trachea when challenged with virulent virus 3 weeks later. Twelve-day-old poults given the 25th Vero passage TRT virus at a dose of 10(3.5) TCID50 per bird were protected against experimental challenge with virulent virus for at least 22 weeks post-primary inoculation. The 25th passage virus was tested for safety by administering ten times the dose (10(4.5) TCID50 per bird) used in the previous trial to a group of 10-day-old turkey poults. None of the birds showed any clinical signs during 21 days post-inoculation. Attempts to back-passage the virus from bird to bird were unsuccessful.
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Affiliation(s)
- R A Williams
- Department of Veterinary Pathology, University of Liverpool, Liverpool, England
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28
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Cook JK, Jones BV, Ellis MM, Jing L, Cavanagh D. Antigenic differentiation of strains of turkey rhinotracheitis virus using monoclonal antibodies. Avian Pathol 2008; 22:257-73. [PMID: 18671016 DOI: 10.1080/03079459308418919] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Monoclonal antibodies (mAbs) were prepared against one UK isolate of turkey rhinotracheitis virus (TRTV). Those which were virus-neutralizing were selected and used, together with polyclonal antisera raised to each isolate in turkeys, in cross-neutralization tests against TRTV strains isolated in the UK and elsewhere. Whilst the polyclonal antisera showed that there was some diversity between them, all strains examined belonged to one serotype. The TRTV strains isolated in the UK could clearly be differentiated from those isolated elsewhere by some of the mAbs. Isolates of TRTV made in South Africa in 1978 and UK in 1985 were more closely related than were isolates made in UK and France within a few months. TRTV strains isolated from turkeys and chickens could not be differentiated. Some mAbs were found to be group-specific in that they neutralized all TRTV strains examined. All mAbs were of either the IgGl or IgG2a isotype and recognized the surface G glycoprotein.
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Affiliation(s)
- J K Cook
- Houghton Laboratory, AFRC Institute for Animal Health, Huntingdon, Cambs, England
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29
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Cubillos A, Ulloa J, Cubillos V, Cook JK. Characterisation of strains of infectious bronchitis virus isolated in Chile. Avian Pathol 2008; 20:85-99. [PMID: 18680002 DOI: 10.1080/03079459108418744] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Nine isolates of infectious bronchitis (IB)-like viruses were made from 23 flocks (broilers or layers) in Chile experiencing the types of disease problems commonly associated with IBV. Their identity as IB viruses was confirmed. The histological changes they caused in tracheal organ cultures (OC) are described. Serum neutralisation tests performed in embryonated eggs (alpha-method) suggested that four of the isolates were serologically related to the Massachusetts (Mass) serotype of IBV and one to Connecticut. The four other strains were examined further by a serum neutralisation test in OC (ss-method). One was found to be of the Mass serotype but the others were found to be unrelated antigenically to a wide range of IBV serotypes isolated in many countries over a number of years. One of these three strains and the Mass strain, when given intranasally to 8-day-old specified pathogen free chickens together with pathogenic serotypes of E.coli, caused some mortality and considerable morbidity. The H120 vaccine strain was found not to protect completely against challenge with these four strains 21 days later.
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Affiliation(s)
- A Cubillos
- Department of Avian Pathology, Universidad Austral de Chile, Valdivia, Chile
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30
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Williams RA, Savage CE, Jones RC. Development of a live attenuated vaccine against turkey rhinotracheitis. Avian Pathol 2008; 20:45-55. [PMID: 18679998 DOI: 10.1080/03079459108418740] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Three preparations of a strain of turkey rhinotracheitis (TRT) virus were tested for their ability to protect turkey poults against challenge with virulent virus given 3 weeks later. The preparations were as follows: one had been passaged in turkey embryo tracheal organ culture (TOC) 98 times, another had been passaged in primary chick embryo fibroblast (CEF) monolayers 28 times and the third had undergone 17 passages in Vero cell monolayers. Each was administered by the eyedrop route to groups of 21-day-old TRT-seronegative turkey poults. The TOC preparation caused clinical signs consistent with TRT infection, indicating the virus had not been attenuated. The CEF and Vero preparations produced no clinical effects. Following challenge with virulent TRT virus at 21 days post-inoculation, the CEF group developed clinical signs consistent with TRT but the TOC and Vero virus groups showed none. All other parameters correlated with these findings. All groups showed an increase in specific SN and ELISA antibodies following challenge. These results indicated that after relatively few passages in Vero cells, this strain of TRT virus became satisfactorily attenuated and was able to offer protection against clinical disease following experimental challenge. Two of the three virus preparations (TOC and Vero) were also shown to spread from the inoculated birds to uninoculated contact birds, introduced into the groups at 5 days post-inoculation, and they induced protection in these contacts against virulent virus challenge.
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Affiliation(s)
- R A Williams
- Department of Veterinary Pathology, Veterinary Field Station, University of Liverpool, Leahurst, Neston, Wirral, England
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31
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Aung YH, Liman M, Neumann U, Rautenschlein S. Reproducibility of swollen sinuses in broilers by experimental infection with avian metapneumovirus subtypes A and B of turkey origin and their comparative pathogenesis. Avian Pathol 2008; 37:65-74. [PMID: 18202952 DOI: 10.1080/03079450701802222] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Swollen head syndrome (SHS) associated with avian metapneumovirus (aMPV) subtype A or subtype B in broilers and broiler breeders has been reported worldwide. Data about pathogenesis of aMPV subtypes A and B in broilers are scarce. It has been difficult to reproduce swollen sinuses in chickens with aMPV under experimental conditions. In the field, SHS in broilers is suspected to be induced by combined infections with different respiratory pathogens. The objectives of the present study were to compare the pathogenesis of subtypes A and B aMPV in commercial broilers and to investigate the reproducibility of clinical disease. In two repeat experiments, commercial broilers free of aMPV maternal antibodies were inoculated with aMPV subtypes A and B of turkey origin. The clinical signs such as depression, coughing, nasal exudates, and frothy eyes appeared at 4 days post inoculation, followed by swelling of periorbital sinuses at 5 days post inoculation. Higher numbers of broilers showed clinical signs in subtype-B-inoculated compared with subtype-A-inoculated groups. Seroconversion to aMPV was detectable from 10 to 11 days post inoculation. The appearance of serum aMPV enzyme-linked immunosorbent assay antibodies and the clearance of the aMPV genome coincided. Subtype B aMPV showed a broader tissue distribution and longer persistence than subtype A. Histopathological changes were observed in the respiratory tract tissues of aMPV-inoculated broilers, and also in paraocular glands, such as the Harderian and lachrymal glands. Overall, our study shows that representative strains of both aMPV turkey isolates induced lesions in the respiratory tract, accompanied by swelling of infraorbital sinuses, indicating the role of aMPV as a primary pathogen for broilers.
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Affiliation(s)
- Ye Htut Aung
- Clinic for Poultry, University of Veterinary Medicine, Hannover, Germany
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Naylor C, Shaw K, Britton P, Cavanagh D. Appearance of type B avian Pneumovirus in great Britain. Avian Pathol 2007; 26:327-38. [DOI: 10.1080/03079459708419215] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Cook JKA, Kinloch S, Ellis MM. In vitro and in vivo studies in chickens and turkeys on strains of turkey rhinotracheitis virus isolated from the two species. Avian Pathol 2007; 22:157-70. [DOI: 10.1080/03079459308418907] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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34
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Cook JK, Holmes H, Finney P, Dolby CA, Ellis MM, Huggins M. A live attenuated turkey rhinotracheitis virus vaccine. 2. The use of the attenuated strain as an experimental vaccine. Avian Pathol 2007; 18:523-34. [DOI: 10.1080/03079458908418624] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Jane K.A. Cook
- a AFRC Institute for Animal Health, Houghton Laboratory , Houghton, Huntingdon, Cambridgeshire, PE17 2DA, England
| | - H.C. Holmes
- b Pitman Moore Ltd , Breakspear Road South, Harefield, Uxbridge, Middlesex, UB9 6LS, England
| | - P.M. Finney
- b Pitman Moore Ltd , Breakspear Road South, Harefield, Uxbridge, Middlesex, UB9 6LS, England
| | - Christine A. Dolby
- a AFRC Institute for Animal Health, Houghton Laboratory , Houghton, Huntingdon, Cambridgeshire, PE17 2DA, England
| | - Marjorie M. Ellis
- a AFRC Institute for Animal Health, Houghton Laboratory , Houghton, Huntingdon, Cambridgeshire, PE17 2DA, England
| | - M.B. Huggins
- a AFRC Institute for Animal Health, Houghton Laboratory , Houghton, Huntingdon, Cambridgeshire, PE17 2DA, England
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35
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Ganapathy K, Cox WJ, Gough RE, Cargill P, Montiel E, Jones RC. Protection in specific pathogen free chickens with live avian metapneumovirus and Newcastle disease virus vaccines applied singly or in combination. Avian Pathol 2007; 36:313-7. [PMID: 17620178 DOI: 10.1080/03079450701460781] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
This paper describes two experiments. In each experiment, 1-day-old specific pathogen free chicks were divided into three groups. In Experiment 1 - [avian metapneumo virus (aMPV) challenge] - one group served as unvaccinated controls; the second group was vaccinated with live aMPV (subtype B) vaccine only, and the third group received the aMPV vaccine in combination with live Newcastle disease virus (NDV) vaccine (VG/GA strain). Oropharyngeal swabs, tissues and blood samples were collected before and after challenge with a virulent subtype aMPV at 21 days post vaccination. Chicks were monitored for post-challenge clinical signs. Swabs and tissues were examined for the detection of challenge aMPV by virus isolation and by reverse-transcriptase polymerase-chain reaction. Sera were assayed for antibodies against aMPV and NDV. The single and combined vaccinated chicks were all protected against clinical signs and no challenge virus was isolated from either of the vaccinated-challenged groups. In Experiment 2 (NDV challenge), as in Experiment 1, chicks were divided into three groups where one group remained as unvaccinated control and the other two groups were vaccinated as above, except that the second group received live NDV vaccine only, instead of aMPV. At 21 days post vaccination, 15 chicks from each of the three groups were removed to a different site and challenged with a virulent NDV (Texas GB strain). Re-isolation of the challenge virus was not attempted. All chicks in both NDV-vaccinated challenged groups were protected against clinical signs and mortality. These results show that, based on parameters monitored for the respective challenge virus, simultaneous application of live aMPV and NDV vaccines did not affect the efficacy of either vaccine.
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Affiliation(s)
- K Ganapathy
- Department of Veterinary Pathology, University of Liverpool, Neston, South Wirral, UK.
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36
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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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Catelli E, Cecchinato M, Savage CE, Jones RC, Naylor CJ. Demonstration of loss of attenuation and extended field persistence of a live avian metapneumovirus vaccine. Vaccine 2006; 24:6476-82. [PMID: 16901592 DOI: 10.1016/j.vaccine.2006.06.076] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2005] [Revised: 06/02/2006] [Accepted: 06/20/2006] [Indexed: 11/15/2022]
Abstract
A live A type avian metapneumovirus (AMPV) vaccine which had been shown to be highly protective and short lived in experimental conditions was found to persist for longer periods in the field and to be associated with disease. Previously other factors such as possible secondary pathogens and management considerations had made it impossible to conclude whether the observed disease was a result of an increase in the vaccine virulence. In this study, an AMPV was isolated from poults on a farm which had been vaccinated with the same live A type vaccine. Full sequencing of the isolate, the vaccine and the vaccine progenitor confirmed its vaccine origin and further showed that generation of the vaccine had only involved nine substitutions of which three coded for amino acid changes. The isolated virus was inoculated into 1-day-old turkey poults in disease secure isolators and shown to cause disease with a severity similar to that caused by virulent field virus. Only two coding mutations were associated with this reversion to virulence.
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Affiliation(s)
- Elena Catelli
- Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano Emilia (BO), Italy.
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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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Chary P, Njenga MK, Sharma JM. Protection by recombinant viral proteins against a respiratory challenge with virulent avian metapneumovirus. Vet Immunol Immunopathol 2005; 108:427-32. [PMID: 16112741 DOI: 10.1016/j.vetimm.2005.06.012] [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] [Received: 01/13/2005] [Revised: 06/09/2005] [Accepted: 06/23/2005] [Indexed: 11/20/2022]
Abstract
Protection by recombinant avian metapneumovirus (aMPV) N or M proteins against a respiratory challenge with virulent aMPV was examined. N, M or N+M proteins were administered intramuscularly (IM) with incomplete Freund's adjuvant (IFA) or by the oculonasal (ON) route with cholera toxin-B (CTB). Each turkey received 40 or 80 microg of each recombinant protein. Birds were considered protected against challenge if the challenge virus was not detectable in the choanal swabs by RT-PCR. At a dose of 40 microg/bird, N protein given with IFA by the IM route protected eight out of nine birds. M protein at the same dose protected three out of seven birds, while a combination of N+M proteins (40 microg each) protected three out of four birds. At a dose of 80 microg of each of N and M proteins per bird given with IFA by the IM route, 100% protection was achieved. ON immunization with a mixture of N and M proteins induced partial protection when the proteins were given with CTB; no detectable protection was noted without CTB. N and M proteins induced anti-aMPV antibodies, although protection against virulent virus challenge did not appear to be associated with the level or presence of antibodies.
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Affiliation(s)
- Parag Chary
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108, USA
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40
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Ganapathy K, Cargill P, Montiel E, Jones RC. Interaction between live avian pneumovirus and Newcastle disease virus vaccines in specific pathogen free chickens. Avian Pathol 2005; 34:297-302. [PMID: 16147565 DOI: 10.1080/03079450500178824] [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] [Indexed: 10/25/2022]
Abstract
One-day-old specific pathogen free White Leghorn chicks were vaccinated with live avian pneumovirus (APV) vaccine, live Newcastle disease virus (NDV) vaccine or both. At intervals up to 28 days after vaccination, distribution of the virus in the tissues was studied, together with humoral and mucosal antibody responses in lachrymal fluid and tracheal washes. APV vaccine was detected for almost twice as long in the dual vaccinates as in the single vaccinates. Higher numbers of isolations of ND virus vaccine were obtained from the dual rather than the single vaccinates at 7 days post-vaccination but the reverse occurred at 14 days. APV serum antibodies were significantly lower in the dual rather than the single vaccinates. However, there were similar levels of local APV-specific IgA in the lachrymal fluids of both single and dual APV vaccinates. NDV serum antibody titres in the dual vaccinates were significantly higher than in the singly NDV-vaccinated chickens. It appears that simultaneous vaccination of chicks with live APV and NDV vaccines causes temporary suppression of APV vaccine proliferation and reduces humoral antibody responses to it, although the antibody response to NDV is enhanced.
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Affiliation(s)
- K Ganapathy
- Department of Veterinary Pathology, University of Liverpool, Leahurst, Neston, South Wirral, CH64 7TE, UK.
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41
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Patnayak D, Sheikh A, Goyal S. Stability of Attenuation in Live Avian Pneumovirus Vaccines. J APPL POULTRY RES 2004. [DOI: 10.1093/japr/13.2.253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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42
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Jirjis FF, Noll SL, Halvorson DA, Nagaraja KV, Martin F, Shaw DP. Effects of Bacterial Coinfection on the Pathogenesis of Avian Pneumovirus Infection in Turkeys. Avian Dis 2004; 48:34-49. [PMID: 15077796 DOI: 10.1637/7017] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Four- and nine-week-old poults were inoculated with cell culture propagated avian pneumovirus (APV) into each conjunctival space and nostril, followed by inoculation 3 days later with Escherichia coli, Bordetella avium (BA), or Ornithobacterium rhinotracheale or a mixture of all three (EBO). Clinical signs were evaluated on days 3, 5, 7, 9, 11, and 14 postinoculation (PI) of APV. The poults were euthanatized on days 2, 4, 6, 10, and 14 PI, and blood and tissues were collected. The poults that received APV followed by EBO or BA alone developed more severe clinical signs related to nasal discharge and swelling of intraorbital sinuses than did poults inoculated with APV alone or bacteria alone. More severe pathologic changes were found in poults inoculated with APV+BA that extended to the air sacs and lungs, particularly in 9-wk-old poults. Bordetella avium was recovered from tracheas and lungs of birds that were inoculated with APV followed by EBO or BA alone. APV was detected by immunohistochemical staining in the upper respiratory tract longer in the groups of poults inoculated with APV and pathogenic bacteria than in those that received only APV, particularly when BA was involved. Viral antigen was also detected in the lungs of poults that were inoculated with APV followed by administration of EBO or BA alone. Loss of cilia on the epithelial surface of the upper respiratory tract was associated with BA infection and may enhance infection with APV, allowing deeper penetration of the virus into the respiratory tract.
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Affiliation(s)
- Faris F Jirjis
- Department of Veterinary PathoBiology, College of Agricultural, Food, and Environmental Sciences, University of Minnesota, Saint Paul, MN 55108, USA
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43
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Patnayak DP, Goyal SM. Cold-Adapted Strain of Avian Pneumovirus as a Vaccine in One-Day-Old Turkeys and the Effect of Inoculation Routes. Avian Dis 2004; 48:155-9. [PMID: 15077809 DOI: 10.1637/7097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
To determine the optimum route of vaccination, we inoculated 1-day-old turkeys with a cold-adapted strain of avian pneumovirus (APV) by oculonasal, oral, or aerosol route. Another two groups served as nonvaccinated-challenged and nonvaccinated-nonchallenged groups. Birds in all vaccinated and nonvaccinated-challenged groups were challenged with virulent APV 3 wk postvaccination. After challenge, no vaccinated bird developed clinical signs or virus shedding, whereas nonvaccinated-challenged birds developed clinical signs (clinical score = 11.2/bird) and shed virus from their choanal cleft. Birds in all three vaccinated groups seroconverted at 3 wk postvaccination. The nonvaccinated-nonchallenged group remained free of clinical signs and virus shedding and did not develop APV antibodies throughout the course of the study. These results suggest that this cold-adapted strain of APV is safe and effective in 1-day-old turkeys when given by any of the three routes.
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Affiliation(s)
- Devi P Patnayak
- Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, 1333 Gortner Avenue, St. Paul, MN 55108, USA
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44
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Alkhalaf AN, Ward LA, Dearth RN, Saif YM. Pathogenicity, transmissibility, and tissue distribution of avian pneumovirus in turkey poults. Avian Dis 2003; 46:650-9. [PMID: 12243529 DOI: 10.1637/0005-2086(2002)046[0650:ptatdo]2.0.co;2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The pathogenicity, transmissibility, tissue distribution, and persistence of avian pneumovirus (APV) in turkey poults were investigated in three experiments. In the first experiment, we inoculated 2-wk-old commercial turkey poults oculonasally with APV alone or in combination with Bordetella avium. In the dually infected group, clinical signs were more severe, the virus persisted longer, the bacteria invaded more respiratory tissues, and the birds had higher antibody titer than the group exposed to APV or B. avium alone. In the second experiment, we studied the distribution of APV in different tissues in experimentally inoculated 2-wk-old commercial turkey poults. Only samples from sinuses, tracheas, and lungs were positive for APV by both reverse transcriptase-polymerase chain reaction and virus isolation. In the third experiment, we studied the ability of APV to spread among birds in 1-wk-old commercial turkey poults inoculated oculonasally. The virus was isolated and the viral RNA was detected in the inoculated and direct contact birds. The virus was not isolated, viral RNA was not detected, and no antibodies were detected in the indirect contact birds. These birds were placed in different cages in the same room where the airflow was directed from the infected toward the uninfected indirect contact group.
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Affiliation(s)
- A N Alkhalaf
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691, USA
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Patnayak DP, Gulati BR, Sheikh AM, Goyal SM. Cold adapted avian pneumovirus for use as live, attenuated vaccine in turkeys. Vaccine 2003; 21:1371-4. [PMID: 12615432 DOI: 10.1016/s0264-410x(02)00722-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We report the development of a cold adapted strain of avian pneumovirus (APV) and its evaluation as a live vaccine candidate in 2-week-old turkey poults. A US isolate of APV (APV/MN/turkey/1-a/97) was serially passaged in Vero cells for 41 passages and then adapted to grow at sub-optimal temperatures by growing successively at 35, 33 and 31 degrees C for eight passages at each temperature. The virus thus adapted to grow at 31 degrees C was used as a candidate vaccine. The birds were vaccinated with two different doses of cold adapted virus and challenged with virulent virus 2 weeks after vaccination. No clinical signs were observed post-vaccination. Upon challenge, no clinical signs were seen in vaccinated birds but severe clinical signs were seen in non-vaccinated, challenged birds. The signs included unilateral or bilateral mucoid nasal discharge, watery eyes and swelling of infraorbital sinuses. The antibody levels in vaccinated birds were not very high. None of the vaccinated birds were found to shed virus after challenge in their choanal secretions whereas all of the non-vaccinated, challenged birds shed the virus. The absence of clinical signs and virus shedding in vaccinated birds as compared to that in non-vaccinated birds suggests that the cold adapted strain of APV is a viable candidate for use as a live, attenuated vaccine in turkeys.
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Affiliation(s)
- Devi P Patnayak
- Department of Veterinary Diagnostic Medicine, University of Minnesota, 1333 Gortner Avenue, St. Paul 55108, USA
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46
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Worthington KJ, Sargent BA, Davelaar FG, Jones RC. Immunity to avian pneumovirus infection in turkeys following in ovo vaccination with an attenuated vaccine. Vaccine 2003; 21:1355-62. [PMID: 12615430 DOI: 10.1016/s0264-410x(02)00689-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Fertile turkey eggs after 24 days of incubation were vaccinated in ovo with a commercial live attenuated subtype A avian pneumovirus (APV) vaccine. Hatchability was not adversely affected. When a high dose (10 times maximum commercial dose) of vaccine was tested in maternal antibody negative (MA-) eggs, mild clinical signs developed in a small proportion of the poults for 1-4 days only. Post-vaccination antibody titres at 3 weeks of age were significantly higher than those seen when the same dose was administered by eyedrop or spray at day-old. A low dose (end of shelf-life titre) of vaccine given to MA- eggs did not cause disease and vaccinated poults were 100% protected against virulent APV challenge at 3 or 5 weeks of age. Post-vaccination antibody titres reached significant levels at 3 weeks of age, whereas those from MA- poults vaccinated by spray at day-old with a similar low dose did not. In a 'worst-case' scenario, maternal antibody positive (MA+) poults vaccinated in ovo with the low dose were still 77% protected against clinical disease, despite lack of seroconversion. The recommended commercial dose of vaccine given to MA- eggs in ovo induced 100% protection against virulent APV challenge for up to 14 weeks of age, even though post-vaccination antibody titres had dropped to insignificant levels at this age. In ovo vaccination with a mixture of the recommended commercial doses of live APV and Newcastle disease (ND) vaccines had no detrimental affect on the efficacy of the APV vaccine. This is the first report of the successful use of an APV vaccine being given in ovo. The results indicate that for turkeys, in ovo vaccination with a live attenuated APV vaccine is safe and effective against virulent challenge and comparable with vaccination by conventional methods.
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Affiliation(s)
- Karen J Worthington
- Department of Veterinary Pathology, Veterinary Teaching Hospital, University of Liverpool, Leahurst, Neston, South Wirral CH64 7TE, UK.
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47
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Patnayak DP, Sheikh AM, Gulati BR, Goyal SM. Experimental and field evaluation of a live vaccine against avian pneumovirus. Avian Pathol 2002; 31:377-82. [PMID: 12396339 DOI: 10.1080/0307945022041651] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The attenuation of an avian pneumovirus (APV) isolate (APV/MN/turkey/1-a/97) by 63 serial passages in cell culture (seven in chicken embryo fibroblasts and 56 in Vero cells) and its evaluation as a live attenuated vaccine in turkey poults is described. The birds were vaccinated with two different doses of attenuated virus (10(4.5) median tissue culture infectious dose (TCID(50))/ml and 10(2.5) TCID(50) /ml) at 2 weeks of age, and were challenged 2 weeks later with virulent APV. No clinical signs were seen in vaccinated, challenged birds, whereas severe clinical signs were observed in the mock-vaccinated, challenged group. Vaccinated birds developed anti-APV antibodies, which increased in titre following challenge with virulent virus. On challenge, none of the vaccinates was found to shed viral nucleic acid as detected by reverse transcriptase-polymerase chain reaction, but non-vaccinated, challenged birds did. The vaccine virus was also evaluated under field conditions in two farms. At one farm, the 'seeder bird approach' was used and two birds per 1,000 birds were vaccinated by the oculo-nasal route. In the second farm, the virus was given to all birds simultaneously in the drinking water. The birds vaccinated by the drinking water route seroconverted earlier and continued to shed virus for longer as compared with birds inoculated by the seeder bird approach. The overall results of this study indicate that the 63rd passage of APV was sufficiently attenuated and offered protection against challenge with virulent virus.
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Affiliation(s)
- Devi P Patnayak
- Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA
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48
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Abstract
Avian pneumoviruses (APVs) cause major disease and welfare problems in many areas of the world. In turkeys the respiratory disease and the effect on egg laying performance are clearly defined. However, in chickens, the role of APV as a primary pathogen is less clear, although it is widely believed to be one of the factors involved in Swollen Head Syndrome. The mechanisms of virus transmission over large distances are not understood, but wild birds have been implicated. APV has recently been reported in the USA for the first time and the virus isolated was a different type or possibly a different serotype from the APVs found elsewhere. Good biosecurity is crucial for controlling infection and highly effective vaccines are available for prophylaxis. Although different subtypes and possibly different serotypes exist, there is good cross protection between them. Diagnosis is usually based on serology using ELISAs, but the available kits give variable results, interpretation is difficult and improved diagnostic tests are required.
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Affiliation(s)
- J K Cook
- Intervet UK, Huntingdon, Cambridgeshire, UK
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49
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Raj GD, Jones RC. Growth of infectious bronchitis virus vaccines in oviducts derived from oestrogen-treated chicks and embryos. Vaccine 1997; 15:163-8. [PMID: 9066033 DOI: 10.1016/s0264-410x(96)00157-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Six commercial infectious bronchitis virus (IBV) vaccines and five IBV field strains were titrated in tracheal organ cultures (TOC) and oviduct organ cultures (OOC). Endpoints were determined in three different ways: ciliostasis (CD50), immunofluorescence staining (IFID50) and organ culture infectivity (OCID50). For the two most attenuated vaccine viruses, infectivity assessed by IFID50 and OCID50 was significantly higher than that assessed by CD50. No significant differences were found between IFID50 and CD50 with the five virulent viruses in either OOC or TOC. This suggests that the most attenuated viruses multiply in these tissues to a greater extent than assessed by their pathogenic potential i.e. ciliostasis. Comparison of IFID50 and CD50 may be a useful method for screening candidate live respiratory viral vaccines for attenuation. OOC prepared from oestrogen-treated embryos were not efficacious.
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Affiliation(s)
- G D Raj
- Department of Veterinary Pathology, University of Liverpool, Neston, South Wirral, UK
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50
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Randhawa JS, Pringle CR, Easton AJ. Nucleotide sequence of the matrix protein gene of a subgroup B avian pneumovirus. Virus Genes 1996; 12:179-83. [PMID: 8879134 DOI: 10.1007/bf00572956] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The nucleotide sequence of the gene encoding the matrix protein of a subgroup B avian pneumovirus has been determined. The gene shows 73.5% homology with that of a subgroup A virus, with most differences occurring in the third codon position. Comparison with pneumovirus matrix proteins shows that the APV matrix protein retains the hydrophobic domain common to the others. The analysis indicates that the matrix protein gene can be used to differentiate the two APV subgroups.
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Affiliation(s)
- J S Randhawa
- Department of Biological Sciences, University of Warwick, Coventry, UK
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