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Sun S, Chen F, Cao S, Liu J, Lei W, Li G, Song Y, Lu J, Liu C, Qin J, Li H. Isolation and characterization of a subtype C avian metapneumovirus circulating in Muscovy ducks in China. Vet Res 2014; 45:74. [PMID: 25060776 PMCID: PMC4222263 DOI: 10.1186/s13567-014-0074-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 06/19/2014] [Indexed: 11/23/2022] Open
Abstract
Subtype C avian metapneumovirus (aMPV-C), is an important pathogen that can cause egg-drop and acute respiratory diseases in poultry. To date, aMPV-C infection has not been documented in Muscovy ducks in China. Here, we isolated and characterized an aMPV-C, designated S-01, which has caused severe respiratory disease and noticeable egg drop in Muscovy duck flocks in south China since 2010. Electron microscopy showed that the isolate was an enveloped virus exhibiting multiple morphologies with a diameter of 20-500 nm. The S-01 strain was able to produce a typical cytopathic effect (CPE) on Vero cells and cause death in 10- to 11-day-old Muscovy duck embryos. In vivo infection of layer Muscovy ducks with the isolate resulted in typical clinical signs and pathological lesions similar to those seen in the original infected cases. We report the first complete genomic sequence of aMPV-C from Muscovy ducks. A phylogenetic analysis strongly suggested that the S-01 virus belongs to the aMPV-C family, sharing 92.3%-94.3% of nucleotide identity with that of aMPV-C, and was most closely related to the aMPV-C strains isolated from Muscovy ducks in France. The deduced eight main proteins (N, P, M, F, M2, SH, G and L) of the novel isolate shared higher identity with hMPV than with other aMPV (subtypes A, B and D). S-01 could bind a monoclonal antibody against the F protein of hMPV. Together, our results indicate that subtype-C aMPV has been circulating in Muscovy duck flocks in South China, and it is urgent for companies to develop new vaccines to control the spread of the virus in China.
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Affiliation(s)
- Shikai Sun
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Feng Chen
- College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Sheng Cao
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Jiajia Liu
- College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Wen Lei
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Guangwei Li
- College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Yongfeng Song
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Junpeng Lu
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Chuang Liu
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Jianping Qin
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
| | - Haiyan Li
- Guangdong Enterprise Key Laboratory for Animal Health and Environmental Control, Department of Poultry Diseases, WENS Group Academy, Guangdong WENS FoodStuff Group Co. Ltd, Yunfu, 527439, Guangdong, China
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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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