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Tang J, Du H, Tang A, Jia N, Zhu J, Li C, Meng C, Liu G. Simultaneous detection and identification of Peste des petits ruminants Virus Lineages II and IV by MCA-Based real-time quantitative RT-PCR assay within single reaction. BMC Vet Res 2023; 19:11. [PMID: 36647038 PMCID: PMC9841696 DOI: 10.1186/s12917-023-03568-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 01/06/2023] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Peste des petits ruminants (PPR) disease is a cross-species infectious disease that severely affects small ruminants and causes great losses to livestock industries in various countries. Distinguishing vaccine-immunized animals from naturally infected animals is an important prerequisite for the eradication of PPR. At present PPRV are classified into lineages I through IV, and only one vaccination strain, Nigeria/75/1, belongs to lineage II, but all of the epidemic strains in China at present are from lineage IV. RESULTS To achieve this goal, we developed an SYBR Green I real-time qRT-PCR method for rapid detection and identification of PPRV lineages II and IV by analyzing different melting curve analyses. The negative amplification of other commonly circulating viruses such as orf virus, goat poxvirus, and foot-and-mouth disease virus demonstrated that primers targeting the L gene of PPRV were extremely specific. The sensitivity of the assay was assessed based on plasmid DNA and the detection limit achieved was 100 copies of PPRV lineages II and IV. CONCLUSION Since the method has high sensitivity, specificity, and reproducibility, it will be effectively differentiated PPRV lineages II from PPRV lineages IV in PPRV infected animals.
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Affiliation(s)
- Jingyu Tang
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Hanyu Du
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Aoxing Tang
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Nannan Jia
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Jie Zhu
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Chuanfeng Li
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Chunchun Meng
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
| | - Guangqing Liu
- grid.410727.70000 0001 0526 1937Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241 Shanghai, PR China
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Ke T, Yang D, Yan Z, Yin L, Shen H, Luo C, Xu J, Zhou Q, Wei X, Chen F. Identification and Pathogenicity Analysis of the Pathogen Causing Spotted Spleen in Muscovy Duck. Front Vet Sci 2022; 9:846298. [PMID: 35677936 PMCID: PMC9169529 DOI: 10.3389/fvets.2022.846298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 02/14/2022] [Indexed: 11/13/2022] Open
Abstract
Since September 2020, the clinical symptoms of Muscovy duck spleen spots have appeared in Guangdong, Guangxi, Jiangxi, Hunan, Hubei, and other provinces, resulting in a large number of Muscovy duck deaths and great economic losses. The absence of the typical clinical symptoms caused by pathogenic microorganisms makes the cause of the spotted spleen a mystery. High-throughput sequencing results suggested that Riemerella anatipestifer (R. anatipestifer) may be the pathogen. Then, R. anatipestifer was regarded as the research target for isolation, identification, and pathogenicity assessment. After biochemical test, PCR amplification, and serotype determination, it was confirmed that the isolated strain CZG-1 was serotype 15 R. anatipestifer. Typical spotted spleen symptoms were observed after CZG-1 infection. Furthermore, drug sensitivity assays showed the similar drug-resistant spectrum of R. anatipestifer serotype 15 to other serotypes; for example, all test strains were resistant to polymyxin, gentamicin, and neomycin. The CZG-1 strain has high pathogenicity, and its lethal dose of 50% (LD50) is 35.122 CFU/ml. Virulence gene determination showed that the CZG-1 strain had at least five virulence genes, bioF, TSS9-1, TSS9-2, PncA, and 0373Right. Above all, this study identified and proved that the pathogen of spotted spleen in ducks was R. anatipestifer serotype 15, which caused death of ducks without the typical symptoms of bacterial infection. The results of this study enriched the knowledge of symptom after R. anatipestifer infection, provided a reference to the identification of the pathogen of spotted spleen, and provided theoretical basis for prevention and control of spotted spleen.
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Affiliation(s)
- Tianqiao Ke
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Dehong Yang
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Zhuanqiang Yan
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Lijuan Yin
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Hanqin Shen
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Cuifen Luo
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Jingyu Xu
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Qingfeng Zhou
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
| | - Xiaona Wei
- Wen's Group Academy, Wen's Foodstuffs Group Co., Ltd., Xinxing, China
- Xiaona Wei
| | - Feng Chen
- College of Animal Science, South China Agricultural University, Guangzhou, China
- *Correspondence: Feng Chen
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Li Y, Cui Y, Liu H, Wang J, Li Y, Wang Y. Establishment of duplex SYBR Green I-based real-time PCR assay for simultaneous detection of duck hepatitis a virus-1 and duck astrovirus-3. Avian Dis 2021; 65:281-286. [PMID: 33496724 DOI: 10.1637/aviandiseases-d-20-00115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 01/25/2021] [Indexed: 11/05/2022]
Abstract
Duck viral hepatitis (DVH) mainly affects ducklings under 1 month of age, causes liver necrosis, enlargement, and hemorrhage, and is highly lethal, seriously jeopardizing the duck industry. The prevalence of serotypes DHAV-1 and DAstV-3 is increasing, and co-infection is common. Moreover, the similar clinical characteristics of the DHAV-1 and DAstV-3 infections and high frequency of co-infection make diagnosis difficult. In this study, to establish a method for the rapid simultaneous detection of DHAV-1 and DAstV-3 , two pairs of specific primers were designed according to their conserved gene regions. A SYBR Green I-based real-time PCR assay was successfully established that can quickly and differentially detect the two viruses. Moreover, the assay is highly specific and does not show cross-reaction with other common viruses. The detection limit of the method is 7.34 × 10 1 copies/μL and 3.78 × 10 1 copies/μL for DHAV-1 and DAstV-3, respectively, indicating high sensitivity. A total of 34 clinical samples were tested using the established method; the positive rates for DHAV-1 and DAstV-3 was 14.71% and 8.82%, respectively, and that for co-infection was 2.94% (1/34), which was better than that obtained with conventional PCR. In summary, the SYBR Green I-based real-time PCR assay established in this study has high specificity, good sensitivity and accuracy, high feasibility, and is rapid. Thus, it can be a powerful tool for the co-infection detection of DHAV-1 and DAstV-3 and for future epidemiological studies.
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Affiliation(s)
| | | | | | | | | | - Yong Wang
- Anhui Agricultural University 130 Changjiang West Road CHINA Hefei 230036 +86 551 65786328
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