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Zhu Y, Hu Z, Lv X, Huang R, Gu X, Zhang C, Zhang M, Wei J, Wu Q, Li J, Zhang R, Cao S, Yin D, Wang B, Liu G, Wang G. A novel Tembusu virus isolated from goslings in China form a new subgenotype 2.1.1. Transbound Emerg Dis 2022; 69:1782-1793. [PMID: 33993639 DOI: 10.1111/tbed.14155] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 05/12/2021] [Indexed: 11/30/2022]
Abstract
Since 2010, several duck Tembusu viruses (DTMUVs) have been isolated from infected ducks in China, and these virus strains have undergone extensive variation over the years. Although the infection rate is high, the mortality rate is usually relatively low-~5%-30%; however, since fall 2019, an infectious disease similar to DTMUV infection but with a high mortality rate of ~50% in goslings has been prevalent in Anhui Province, China. The present study identified a new Tembusu virus, designated DTMUV/Goose/China/2019/AQ-19 (AQ-19), that is believed to be responsible for the noticeably high mortality in goslings. To investigate the genetic variation of this strain, its entire genome was sequenced and analysed for specific variations, and goslings and mice were challenged with the isolated virus to investigate its pathogenicity. The AQ-19 genome shared only 94.3%-96.9% and 90.9% nucleotide identity with other Chinese and Malaysian DTMUVs, respectively; however, AQ-19 has high homology with Thailand DTMUVs (97.2%-98.1% nucleotide identity). Phylogenetic analysis of the E gene revealed that AQ-19 and most of Thailand DTMUVs form a branch separate from any of the previously reported DTMUV strains in China. After the challenge, some goslings and mice showed typical clinical signs of DTMUV, particularly severe neurological dysfunction. AQ-19 has high virulence in goslings and mice, resulting in 60% and 70% mortality through intramuscular and intracerebral routes, respectively. Pathological examination revealed severe histological lesions in the brain and liver of the infected goslings and mice. Taken together, these results demonstrated the emergence of a novel Tembusu virus with high virulence circulating in goslings in China for the first time, and our findings highlight the high genetic diversity of DTMUVs in China. Further study of the pathogenicity and host range of this novel Tembusu virus is particularly important.
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Affiliation(s)
- Yingqi Zhu
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
- College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
| | - Zengjin Hu
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Xuan Lv
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Rong Huang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Xiangxue Gu
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Chong Zhang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Miao Zhang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Juanwen Wei
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Qiong Wu
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Jiaming Li
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Ruichen Zhang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Shoulin Cao
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Dongdong Yin
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
- College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
| | - Bei Wang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
| | - Guangqing Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Guijun Wang
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, China
- College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
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The Evolution, Genomic Epidemiology, and Transmission Dynamics of Tembusu Virus. Viruses 2022; 14:v14061236. [PMID: 35746707 PMCID: PMC9227414 DOI: 10.3390/v14061236] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 12/10/2022] Open
Abstract
Tembusu virus (TMUV) can induce severe egg drop syndrome in ducks, causing significant economic losses. In this study, the possible origin, genomic epidemiology, and transmission dynamics of TMUV were determined. The time to the most recent common ancestor of TMUV was found to be 1924, earlier than that previously reported. The effective population size of TMUV increased rapidly from 2010 to 2013 and was associated with the diversification of different TMUV clusters. TMUV was classified into three clusters (clusters 1, 2, and 3) based on the envelope (E) protein. Subcluster 2.2, within cluster 2, is the most prevalent, and the occurrence of these mutations is accompanied by changes in the virulence and infectivity of the virus. Two positive selections on codons located in the NS3 and NS5 genes (591 of NS3 and 883 of NS5) were identified, which might have caused changes in the ability of the virus to replicate. Based on phylogeographic analysis, Malaysia was the most likely country of origin for TMUV, while Shandong Province was the earliest province of origin in China. This study has important implications for understanding TMUV and provides suggestions for its prevention and control.
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Gong H, Fan Y, Zhou P, Li Y, Hu X, Jin H, Luo R. Identification of a linear epitope within domain I of Duck Tembusu virus envelope protein using a novel neutralizing monoclonal antibody. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 115:103906. [PMID: 33127560 DOI: 10.1016/j.dci.2020.103906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Duck Tembusu virus (DTMUV) is a newly emerging pathogenic flavivirus that caused severe egg drop syndrome in laying ducks in China since 2010, leading to massive economic losses to the duck industry. Although the DTMUV E protein is considered to be critical in inducing the protective immune response, the functional epitopes within this protein remain largely unknown. In the present study, we isolated a DTMUV neutralizing monoclonal antibody (mAb) 3B8 from DTMUV E-immunized mice. Epitope mapping showed that mAb 3B8 recognized a novel linear epitope FSCLGMQNR located on the extreme N-terminal of the domain I (EDI) of E protein. Sequence alignment and Western blot analyses showed that the epitope is greatly conserved with high DTMUV-specificity. Moreover, upon cloning the heavy and light chain variable region sequences of mAb 3B8, we prepared the single-chain variable antibody fragment (scFv) 3B8 by connecting the two chains via a flexible peptide linker. The recombinant scFv 3B8 exhibited antiviral activity against DTMUV infection in vitro and in vivo. Our results provide valuable implications for the development of DTMUV vaccines and therapeutics.
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Affiliation(s)
- Huimin Gong
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
| | - Yufang Fan
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
| | - Peng Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
| | - Yaqian Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
| | - Xueying Hu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Hui Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
| | - Rui Luo
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China.
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Sun X, Liu E, Iqbal A, Wang T, Wang X, Haseeb A, Ahmed N, Yang P, Chen Q. The dynamic distribution of duck Tembusu virus in the spleen of infected shelducks. BMC Vet Res 2019; 15:112. [PMID: 30975151 PMCID: PMC6460551 DOI: 10.1186/s12917-019-1860-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 04/03/2019] [Indexed: 11/10/2022] Open
Abstract
Background Duck Tembusu virus (DTMUV) is a novel member of Flavivirus. The isolated and purified DTMUV strain XZ-2012 was used as a strain model, to intramuscularly inject the six-month egg-laying shelducks with the infective dose of 104TCID50. The dynamic distribution of the virus in spleen at different time post-infection (pi) was studied using RT-PCR, RT-qPCR, ELISA, immunofluorescence and transmission electron microscopy (TEM). Result The results showed that the virus occurred in the spleen after 2 hpi and lasted up to 18 dpi. The registered viral load increased from 2 hpi to 3 dpi, and then it diminished from 6 dpi to 18 dpi with a slight rise at 12 dpi. From 2 hpi to 6 dpi the DTMUV particles were mostly distributed in the periellipsoidal lymphatic sheath (PELS) of spleen white pulp, few being found in the sheathed capillary. From 9 dpi to 18 dpi, the DTMUV particles were migrating into periarterial lymphatic sheaths (PALS) around the central artery through the red pulp. Under TEM, the virus particles could be observed mostly in lymphocytes and macrophages. Conclusion It was suggested that DTMUV invaded lymphocytes and macrophages of the spleen at 2 hpi and replicated significantly from 1 dpi to 3 dpi, being eliminated from 9 dpi to 18 dpi. This is the first study on the dynamic distribution of DTMUV from invasion to elimination in duck spleen conducted by molecular and morphological methods. It could provide theoretical basis for the occurrence, development and detoxification of the virus in the organs of the immune system.
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Affiliation(s)
- Xuejing Sun
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Enxue Liu
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Adeela Iqbal
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Taozhi Wang
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Xindong Wang
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Abdul Haseeb
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Nisar Ahmed
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Ping Yang
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China
| | - Qiusheng Chen
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Wei gang No.1, Nanjing, 210095, Jiangsu Province, China.
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Full-Genome Characterization and Genetic Evolution of West African Isolates of Bagaza Virus. Viruses 2018; 10:v10040193. [PMID: 29652824 PMCID: PMC5923487 DOI: 10.3390/v10040193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/12/2018] [Accepted: 03/30/2018] [Indexed: 01/26/2023] Open
Abstract
Bagaza virus is a mosquito-borne flavivirus, first isolated in 1966 in Central African Republic. It has currently been identified in mosquito pools collected in the field in West and Central Africa. Emergence in wild birds in Europe and serological evidence in encephalitis patients in India raise questions on its genetic evolution and the diversity of isolates circulating in Africa. To better understand genetic diversity and evolution of Bagaza virus, we describe the full-genome characterization of 11 West African isolates, sampled from 1988 to 2014. Parameters such as genetic distances, N-glycosylation patterns, recombination events, selective pressures, and its codon adaptation to human genes are assessed. Our study is noteworthy for the observation of N-glycosylation and recombination in Bagaza virus and provides insight into its Indian origin from the 13th century. Interestingly, evidence of Bagaza virus codon adaptation to human house-keeping genes is also observed to be higher than those of other flaviviruses well known in human infections. Genetic variations on genome of West African Bagaza virus could play an important role in generating diversity and may promote Bagaza virus adaptation to other vertebrates and become an important threat in human health.
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Sun M, Dong J, Li L, Lin Q, Sun J, Liu Z, Shen H, Zhang J, Ren T, Zhang C. Recombinant Newcastle disease virus (NDV) expressing Duck Tembusu virus (DTMUV) pre-membrane and envelope proteins protects ducks against DTMUV and NDV challenge. Vet Microbiol 2018; 218:60-69. [PMID: 29685222 PMCID: PMC7117350 DOI: 10.1016/j.vetmic.2018.03.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/23/2018] [Accepted: 03/27/2018] [Indexed: 12/17/2022]
Abstract
Firstly generated a NDV-vectored Duck Tembusu Virus (DTMUV) bivalent vaccine that expressing the pre-membrane and envelope proteins of DTMUV. Evaluated the efficacy of the NDV-vectored Duck Tembusu Virus bivalent vaccine. Provided a new method for NDV and DTMUV controlling in waterfowl.
The newly emerged Duck Tembusu virus (DTMUV) is responsible for considerable economic loss in waterfowl-raising areas in China since 2010. Meanwhile, the virulent Newcastle disease virus (NDV) has also caused sporadic outbreaks in waterfowl. The individual vaccines against both diseases are available, however, there is no bivalent or combined vaccine for either disease. Here, we constructed a recombinant NDV-vectored vaccine candidate that expresses the pre-membrane (prM) and envelope (E) genes from DTMUV, designated as aGM/prM + E. The foreign prM and E proteins were stably expressed in aGM/prM + E and exhibited similar pathogenicity but higher growth kinetics than those of the parental virus. The aGM/prM + E carries a fusion cleavage site in accordance with avirulent viruses that have been frequently isolated from waterfowl, and induced remarkably (p < 0.001) higher NDV-specific hemagglutination inhibition (HI) titers than commercially available live NDV vaccines (LaSota strain). The aGM/prM + E also elicited significantly higher (p < 0.05) virus neutralization (VN) titers than commercially available DTMUV inactivated vaccines (HB strain). The aGM/prM + E not only provided complete protection against NDV challenge but also reduced the gross lesions on ovarian folliculi and provided 80% protection against DTMUV in ducks. We note that the aGM/prM + E vaccine can prevent challenged ducks from shedding of NDV and DTMUV. Our results suggest that the candidate vaccine aGM/prM + E would help decrease NDV and DTMUV transmissions in waterfowl raising areas in China.
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Affiliation(s)
- Minhua Sun
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Jiawen Dong
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Linlin Li
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Qiuyan Lin
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Guangzhou, Guangdong, China
| | - Junying Sun
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Zhicheng Liu
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Haiyan Shen
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Jianfeng Zhang
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China
| | - Tao Ren
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Guangzhou, Guangdong, China.
| | - Chunhong Zhang
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture; Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Baishigang Road, Guangzhou, Guangdong, China.
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Bodewes R. Novel viruses in birds: Flying through the roof or is a cage needed? Vet J 2018; 233:55-62. [PMID: 29486880 DOI: 10.1016/j.tvjl.2017.12.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 09/28/2017] [Accepted: 12/28/2017] [Indexed: 01/17/2023]
Abstract
Emerging viral diseases continue to have a major global impact on human beings and animals. To be able to take adequate measures in case of an outbreak of an emerging disease, rapid detection of the causative agent is a crucial first step. In this review, various aspects of virus discovery are discussed, with a special focus on recently discovered viruses in birds. Novel viruses with a potential major impact have been discovered in domestic and wild bird species in recent years using various virus discovery methods. Only a few studies report the detection of novel viruses in endangered bird species, although increased knowledge about viruses circulating in these species is important. Additional studies focusing on the exact role of a novel virus in disease and on the impact of a novel virus on bird populations are often lacking. Intensive collaboration between different disciplines is needed to obtain useful information about the role of these novel viruses.
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Affiliation(s)
- R Bodewes
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
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Zhu K, Huang J, Jia R, Zhang B, Wang M, Zhu D, Chen S, Liu M, Yin Z, Cheng A. Identification and molecular characterization of a novel duck Tembusu virus isolate from Southwest China. Arch Virol 2015; 160:2781-90. [PMID: 26303137 DOI: 10.1007/s00705-015-2513-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Accepted: 06/24/2015] [Indexed: 11/28/2022]
Abstract
Tembusu virus (TMUV) has caused significant economic losses in the Chinese duck industry and may have been overlooked regarding its zoonotic transmission potential. A novel TMUV isolate (named CQW1) was separated from the liver tissue of a young duck in Southwest China. The CQW1 isolate proliferated in embryonated duck eggs and led to death within 3-4 days post-inoculation. Furthermore, CQW1 replicated in duck embryo fibroblast (DEF) cells and caused a cytopathic effect (CPE). The disease emerged on a duck farm in Southwest China and was reproduced by animal experiment. We found that CQW1 was detectable by RT-PCR in brain and liver tissues of dead ducklings within 5 days after inoculation. Most importantly, concentrated nuclei, neuronophagia and microglial nodules were observed in the brain tissue of the inoculated ducklings, and additionally, the liver tissue was affected, mainly by disordered lobular architecture, degeneration, necrosis and regenerated hepatocytes. Analysis of the complete genome sequence showed that CQW1 was 10,992 nt in length with two nucleotide insertions and shared 96.8% to 99.1% and 98.4% to 99.6% identity at nucleotide and amino acid level, respectively, with Chinese isolates. Phylogenetic analysis of the nucleotide sequences demonstrated that the CQW1 isolate was closely related to other members of the genus Flavivirus and formed a new clade together with the GX2013H isolate. Also, the CQW1 isolate demonstrated the highest average pairwise distance value among the Chinese isolates. In the present study, we obtained evidence that TMUV is present in Southwest China. Extensive pathological and epidemiological studies are urgently needed.
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Affiliation(s)
- Kesen Zhu
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Juan Huang
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Renyong Jia
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China. .,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China. .,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China.
| | - Bin Zhang
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Mingshu Wang
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China.,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China
| | - Dekang Zhu
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China
| | - Shun Chen
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China.,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China
| | - Mafeng Liu
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China.,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China
| | - Zhongqiong Yin
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China
| | - Anchun Cheng
- Avian Disease Research Center, Sichuan Agricultural University, Chengdu, 611130, China. .,Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China. .,Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, 611130, China.
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