Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers
Control strategy of respiratory complex infections should address precipitating and predisposing causative agents in general and immunosuppressive agents in particular. In both clinical and subclinical forms, infectious bursal disease virus (IBDV) is one of the most immunosuppressive diseases of you...
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| Format: | Article |
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Razi Vaccine and Serum Research Institute
2022-06-01
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| Series: | Archives of Razi Institute |
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| Online Access: | https://archrazi.areeo.ac.ir/article_126510_805fc277b78149124f819182fb474377.pdf |
| _version_ | 1828335860862418944 |
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| author | A Sharifi M Allymehr A Talebi |
| author_facet | A Sharifi M Allymehr A Talebi |
| author_sort | A Sharifi |
| collection | DOAJ |
| description | Control strategy of respiratory complex infections should address precipitating and predisposing causative agents in general and immunosuppressive agents in particular. In both clinical and subclinical forms, infectious bursal disease virus (IBDV) is one of the most immunosuppressive diseases of young chickens. This study aimed to investigate the concurrent occurrence of subclinical infectious bursal disease (IBD) and multicausal respiratory complex infections caused by Newcastle disease virus (NDV) and avian metapneumovirus (aMPV) in broilers. In this study, 800 tissue samples (e.g., trachea, cecal tonsil, bursa of Fabricius, and spleen) and 400 sera samples were collected from broilers with confirmed respiratory signs selected from 20 broiler farms in west Azerbaijan province, Iran, from October 2018 to February 2019. Pathogens in the tissue samples were detected using RT-PCR for the VP2 gene of IBDV, F gen of NDV, and N gene of aMPV. The amplified products were sequenced afterward. At the end of the husbandry period, sera samples were used to detect antibodies against IBDV, aMPV, and NDV using ELISA and HI tests. Molecular results showed that the 45% (9/20), 30% (6/20), and 15% (3/20) of tissue samples were positive for IBDV, NDV, and aMPV, respectively. Regarding co-infection, 5% (1/20) of farm isolates were positive for IBD and ND, while 10% (2/20) of farms isolates were positive for IBD and aMPV. Co-infection of IBD, ND, and aMPV was not detected in farm isolates. Serological results indicated that the IBD co-infected flocks had almost higher (P<0.05) antibody titers against IBD; however, IBDV-NDV co-infected flocks and IBDV-aMPV co-infected flocks had lower antibody titer against NDVand aMPV, respectively. It can be concluded that lower antibody titer against ND and aMPV in IBD-ND and IBD-aMPV co-infections indicated suppressive effects of IBD on these diseases. Therefore, vaccination against IBD even in regions without clinical form of IBD is inevitable for the reduction of immunosuppressive effects of subclinical IBD on immune responses against these diseases. |
| first_indexed | 2024-04-13T21:52:04Z |
| format | Article |
| id | doaj.art-b7e3e75935b44091ba5494f7d7dd0ba3 |
| institution | Directory Open Access Journal |
| issn | 0365-3439 2008-9872 |
| language | English |
| last_indexed | 2024-04-13T21:52:04Z |
| publishDate | 2022-06-01 |
| publisher | Razi Vaccine and Serum Research Institute |
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| series | Archives of Razi Institute |
| spelling | doaj.art-b7e3e75935b44091ba5494f7d7dd0ba32022-12-22T02:28:23ZengRazi Vaccine and Serum Research InstituteArchives of Razi Institute0365-34392008-98722022-06-017731007101610.22092/ari.2021.354272.1631126510Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in BroilersA Sharifi0M Allymehr1A Talebi2Department of Poultry Health and Diseases, Faculty of Veterinary Medicine, Urmia, IranDepartment of Poultry Health and Diseases, Faculty of Veterinary Medicine, Urmia, IranDepartment of Poultry Health and Diseases, Faculty of Veterinary Medicine, Urmia, IranControl strategy of respiratory complex infections should address precipitating and predisposing causative agents in general and immunosuppressive agents in particular. In both clinical and subclinical forms, infectious bursal disease virus (IBDV) is one of the most immunosuppressive diseases of young chickens. This study aimed to investigate the concurrent occurrence of subclinical infectious bursal disease (IBD) and multicausal respiratory complex infections caused by Newcastle disease virus (NDV) and avian metapneumovirus (aMPV) in broilers. In this study, 800 tissue samples (e.g., trachea, cecal tonsil, bursa of Fabricius, and spleen) and 400 sera samples were collected from broilers with confirmed respiratory signs selected from 20 broiler farms in west Azerbaijan province, Iran, from October 2018 to February 2019. Pathogens in the tissue samples were detected using RT-PCR for the VP2 gene of IBDV, F gen of NDV, and N gene of aMPV. The amplified products were sequenced afterward. At the end of the husbandry period, sera samples were used to detect antibodies against IBDV, aMPV, and NDV using ELISA and HI tests. Molecular results showed that the 45% (9/20), 30% (6/20), and 15% (3/20) of tissue samples were positive for IBDV, NDV, and aMPV, respectively. Regarding co-infection, 5% (1/20) of farm isolates were positive for IBD and ND, while 10% (2/20) of farms isolates were positive for IBD and aMPV. Co-infection of IBD, ND, and aMPV was not detected in farm isolates. Serological results indicated that the IBD co-infected flocks had almost higher (P<0.05) antibody titers against IBD; however, IBDV-NDV co-infected flocks and IBDV-aMPV co-infected flocks had lower antibody titer against NDVand aMPV, respectively. It can be concluded that lower antibody titer against ND and aMPV in IBD-ND and IBD-aMPV co-infections indicated suppressive effects of IBD on these diseases. Therefore, vaccination against IBD even in regions without clinical form of IBD is inevitable for the reduction of immunosuppressive effects of subclinical IBD on immune responses against these diseases.https://archrazi.areeo.ac.ir/article_126510_805fc277b78149124f819182fb474377.pdfavian metapneumovirusbroilerbursal disease virusnewcastle diseaserespiratory complex |
| spellingShingle | A Sharifi M Allymehr A Talebi Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers Archives of Razi Institute avian metapneumovirus broiler bursal disease virus newcastle disease respiratory complex |
| title | Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers |
| title_full | Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers |
| title_fullStr | Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers |
| title_full_unstemmed | Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers |
| title_short | Concurrent Occurrence of Infectious Bursal Disease and Multicausal Respiratory Infections Caused by Newcastle Disease and Avian Metapneumovirus in Broilers |
| title_sort | concurrent occurrence of infectious bursal disease and multicausal respiratory infections caused by newcastle disease and avian metapneumovirus in broilers |
| topic | avian metapneumovirus broiler bursal disease virus newcastle disease respiratory complex |
| url | https://archrazi.areeo.ac.ir/article_126510_805fc277b78149124f819182fb474377.pdf |
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