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Zhang S, Xu H, Guo Z, Xiang L, Li C, Gong B, Li J, Feng Z, Kang H, Wang Q, Zhou G, Leng C, Zhao K, Tang YD, Liu H, An TQ, Cai X, Peng J, Tian ZJ, Zhang H. Genomic characteristics and epidemic trends of NADC30-like PRRSV in China. Porcine Health Manag 2025; 11:30. [PMID: 40437623 PMCID: PMC12121172 DOI: 10.1186/s40813-025-00444-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2025] [Accepted: 05/08/2025] [Indexed: 06/01/2025] Open
Abstract
BACKGROUND NADC30-like PRRSV was first identified in China in 2012 and had become the predominant circulating strain since 2016. Currently, the recombination patterns of NADC30-like PRRSV in China exhibit a high degree of complexity, characterized by low whole-genome sequence homology. The genomic features and epidemiological trends of these strains remain to be elucidated. RESULTS To evaluate the prevalence of NADC30-like PRRSV in China, this study acquired 30 whole-genome sequences of NADC30-like strains via Next-Generation Sequencing (NGS). These sequences were subsequently integrated with 224 whole-genome sequences from China available in the GenBank database. A comprehensive analysis of the genomic characteristics of contemporary NADC30-like PRRSV strains in China was conducted. Recombinant analysis indicated a yearly increase in the number of NADC30-like strains exhibiting recombination signals, whereas nonrecombinant NADC30-like strains have become nearly extinct. Among the recombination events, those involving L1C and L8E as parental strains are most prevalent. Based on the results of recombination and phylogenetic analyses, this study classified 120 Chinese NADC30-like strains with similar recombination characteristics into groups NADC30-R1 to R12. The intra-group genetic distances of the NADC30-R1 to R12 groups approximately 5.73% (SD ± 1.68), while the inter-group genetic distances between different groups are usually stably greater than 10%. The amino acid alignment of Nsp2 demonstrated that all NADC30-R1 to R12 strains exhibit a discontinuous deletion of 131 amino acids. These classifications do not exhibit consistent pathogenic characteristics within groups, with most NADC30-like PRRSVs showing moderate virulence. Geographical distribution analysis indicated that NADC30 whole-genome sequences in China originated from 19 provinces. Notably, the NADC30-R1 and NADC30-R2 strains are the most widely distributed and abundant, suggesting that these variants have established localized epidemics in specific regions. CONCLUSION In summary, the vast majority of NADC30-like strains in our country have undergone recombination, L1C + L8E is the most common recombination mode. The NADC30-like strains in China can be classified into 12 different recombination patterns, NADC30-R1 and NADC30-R2 strains are already showing pandemic trends. These findings provide a critical foundation for future NADC30-like PRRSV prevention and control strategies.
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Affiliation(s)
- Siyu Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Hu Xu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Zhenyang Guo
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Lirun Xiang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, 071000, China
| | - Chao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Bangjun Gong
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Jinhao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Zixuan Feng
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Haonan Kang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Qian Wang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Guohui Zhou
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Chaoliang Leng
- Henan Provincial Engineering and Technology Center of Animal Disease Diagnosis and Integrated Control, Nanyang Normal University, Nanyang, 473061, China
| | - Kuan Zhao
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, 071000, China
| | - Yan-Dong Tang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Huairan Liu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Tong-Qing An
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Xuehui Cai
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Jinmei Peng
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China.
| | - Zhi-Jun Tian
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China.
| | - Hongliang Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China.
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Liu J, Yan X, Wu W, Li Y, Xing S, Zhao S, Huang X, Zhao Q, Wen Y, Cao S, Du S, Yan Q, Zeng N. Evaluation of cross-protection of a reduced-dose PRRS MLV vaccine against the NADC30-like PRRSV challenge. Front Vet Sci 2024; 11:1492173. [PMID: 39606654 PMCID: PMC11599974 DOI: 10.3389/fvets.2024.1492173] [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: 09/06/2024] [Accepted: 10/28/2024] [Indexed: 11/29/2024] Open
Abstract
Introduction At present, the NADC30-like strain has become the prevalent strain of PRRSV in China. Many studies have found that existing commercial vaccines are ineffective or provide only limited protection. No study has investigated the cross-protection of different dosages of commercial MLV vaccines against NADC30-like PRRSV. Therefore, this study assessed the effectiveness of various dosages against a NADC30-like PRRSV infection using commercial PRRSV vaccines, Ingelvac PRRS MLV, which have been widely utilized in China. Methods In this study, we immunized piglets with four different dosages of the MLV vaccine and infected piglets within a nasal way with NADC30-like CF PRRSV at 28 days post-vaccination. We observed the status of pigs before and after the challenge of NADC30-like PRRSV CF strain and reflected the protective effect of different dosages of MLV vaccine through multiple assays. Results Compared to those piglets immunized with 1 dosage, the piglets immunized with 0.01 dosage had better performance, such as the highest average daily gain before the challenge, lesser lesions and viremia after the challenge, low clinical score, and stable temperature during the study. However, the piglets immunized with 0.01 dosage still showed viremia, viruses were detected in their lungs, tonsils, and inguinal lymph nodes, and pathological lesions occurred in their lung. Immunohistochemistry staining of the lung of vaccinated piglets revealed a similar viral load to that of unvaccinated piglets, suggesting that immunization could not completely remove the virus from the vaccinated piglets' tissues. Discussion Our research suggests that the MLV vaccine could provide limited protection against the NADC30-like PRRSV infection, and lowering the dosage to 0.01 may produce better protective efficacy. In the context of identifying the immunological target, comprehending the virulence of the virus in the field, and guaranteeing safety, we might be able to reevaluate vaccination dosages to achieve higher economic value.
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Affiliation(s)
- Jiayu Liu
- Giantstar Farming & Husbandry Co., Ltd, Chengdu, Sichuan, China
| | - Xinyu Yan
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Wensi Wu
- Giantstar Farming & Husbandry Co., Ltd, Chengdu, Sichuan, China
| | - Yan Li
- Giantstar Farming & Husbandry Co., Ltd, Chengdu, Sichuan, China
| | - Shuaibin Xing
- Giantstar Farming & Husbandry Co., Ltd, Chengdu, Sichuan, China
| | - Shan Zhao
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xiaobo Huang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Qin Zhao
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yiping Wen
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Sanjie Cao
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Senyan Du
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Qigui Yan
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Nanfang Zeng
- Giantstar Farming & Husbandry Co., Ltd, Chengdu, Sichuan, China
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Gong B, Xu H, Sun Q, Li C, Xiang L, Zhao J, Li W, Guo Z, Li J, Wang Q, Peng J, Zhou G, Leng C, Tang YD, Wu J, Liu H, An TQ, Cai X, Tian ZJ, Zhang H. Dissecting Genetic Diversity and Evolutionary Trends of Chinese PRRSV-1 Based on Whole-Genome Analysis. Transbound Emerg Dis 2024; 2024:9705539. [PMID: 40303037 PMCID: PMC12017348 DOI: 10.1155/2024/9705539] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 05/02/2025]
Abstract
Porcine reproductive and respiratory syndrome (PRRS) poses a serious threat to the Chinese swine industry. The etiological agent PRRSV can be classified as either PRRSV-1 or PRRSV-2. Recent studies have revealed an increase in the rates of PRRSV-1 detection and a wider PRRSV-1 distribution. However, the PRRSV-1 genome in China has yet to be fully characterized. In this study, 24 whole PRRSV-1 genomes from different swine farms were assembled and subjected to whole-genome analysis. A phylogenetic analysis based on the complete genome and ORF5 sequences revealed that the PRRSV-1 strains from China belonged to Western European Subtype I and could be classified into seven subgroups. Statistical analysis revealed that BJEU06-1-Like PRRSV is currently the predominant PRRSV-1 strain. Moreover, a similarity analysis showed low pairwise similarity between most PRRSV-1 genomes from different pig farms. Amino acid alignments of the Nsp2 gene revealed that the BJEU06-1-Like subgroup had five discontinued aa deletions (4 + 1). The new subgroup 1 had 11 continued aa deletions and an aa insertion, the new subgroup 2 had two discontinued aa deletions (1 + 1), and, except for in the case of HKEU16, the HKEU16-Like subgroup had five discontinuous aa deletions (1 + 4). Recombination analysis revealed that the BJEU06-1-Like and NMEU09-1-Like strains participated extensively in recent recombination events. The analysis of positive selection suggested that there were 15 positively selected codons in site model, and there were five sites under positive selection in the BJEU06-1-Like subgroup in the branch-site model. The mean rate and tMRCA for PRRSV-1 strains from China were 4.11 × 10-3 substitutions/site/year and 1,969.63, respectively. Thus, it is crucial to strengthen epidemiological surveys of PRRSV-1 in China, especially those monitoring BJEU06-1-Like PRRSV.
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Affiliation(s)
- Bangjun Gong
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Hu Xu
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Qi Sun
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Chao Li
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Lirun Xiang
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Jing Zhao
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Wansheng Li
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Zhenyang Guo
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Jinhao Li
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Qian Wang
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Jinmei Peng
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Guohui Zhou
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Chaoliang Leng
- Henan Provincial Engineering and Technology Center of Animal Disease Diagnosis and Integrated ControlNanyang Normal UniversityNanyang473061China
| | - Yan-Dong Tang
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Jianan Wu
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Huairan Liu
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Tong-Qing An
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Xuehui Cai
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Zhi-Jun Tian
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
| | - Hongliang Zhang
- State Key Laboratory for Animal Disease Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150001China
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4
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Li C, Zhao J, Li W, Xu H, Gong B, Sun Q, Guo Z, Li J, Xiang L, Tang YD, Leng C, Wang Q, Peng J, Zhou G, Liu H, An T, Cai X, Tian ZJ, Zhang H. Prevalence and genetic evolution of porcine reproductive and respiratory syndrome virus in commercial fattening pig farms in China. Porcine Health Manag 2024; 10:5. [PMID: 38254191 PMCID: PMC10801985 DOI: 10.1186/s40813-024-00356-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 01/16/2024] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND To investigate the prevalence and evolution of Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) at commercial fattening pig farms, a total of 1397 clinical samples were collected from a single fattening cycle at seven pig farms in five provinces of China from 2020 to 2021. RESULTS The RT‒PCR results revealed that PRRSV was present on all seven farms, and the percentage of PRRSV-positive individuals was 17.54-53.33%. A total of 344 partial NSP2 gene sequences and 334 complete ORF5 gene sequences were obtained from the positive samples. The statistical results showed that PRRSV-2 was present on all seven commercial fattening farms, and PRRSV-1 was present on only one commercial fattening farm. A total of six PRRSV-2 subtypes were detected, and five of the seven farms had two or more PRRSV-2 subtypes. L1.8 (L1C) PRRSV was the dominant epidemic strain on five of the seven pig farms. Sequence analysis of L1.8 (L1C) PRRSV from different commercial fattening pig farms revealed that its consistency across farms varied substantially. The amino acid alignment results demonstrated that there were 131 aa discontinuous deletions in NSP2 between different L1.8 (L1C) PRRSV strains and that the GP5 mutation in L1.8 (L1C) PRRSV was mainly concentrated in the peptide signal region and T-cell epitopes. Selection pressure analysis of GP5 revealed that the use of the PRRSV MLV vaccine had no significant episodic diversifying effect on L1.8 (L1C) PRRSV. CONCLUSION PRRSV infection is common at commercial fattening pig farms in China, and the percentage of positive individuals is high. There are multiple PRRSV subtypes of infection at commercial fattening pig farms in China. L1.8 (L1C) is the main circulating PRRSV strain on commercial fattening pig farms. L1.8 (L1C) PRRSV detected at different commercial fattening pig farms exhibited substantial differences in consistency but similar molecular characteristics. The pressure on the GP5 of L1.8 (L1C) PRRSV may not be directly related to the use of the vaccines.
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Affiliation(s)
- Chao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Jing Zhao
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Wansheng Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Hu Xu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Bangjun Gong
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Qi Sun
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Zhenyang Guo
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Jinhao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Lirun Xiang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Yan-Dong Tang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Chaoliang Leng
- Henan Key Laboratory of Insect Biology in Funiu Mountain, Henan Provincial Engineering Laboratory of Insects Bioreactor, China-UK-NYNU-RRes Joint Laboratory of Insect Biology, Nanyang Normal University, Nanyang, 473061, China
| | - Qian Wang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Jinmei Peng
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Guohui Zhou
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Huairan Liu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Tongqing An
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Xuehui Cai
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Zhi-Jun Tian
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China
| | - Hongliang Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, CAAS, No. 678 Haping Road, Xiangfang District, Harbin, 150001, China.
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5
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Xu H, Li C, Gong B, Li W, Guo Z, Sun Q, Zhao J, Xiang L, Li J, Tang YD, Leng C, Wang Q, Peng J, Zhou G, Liu H, An T, Cai X, Tian ZJ, Zhang H. Protective Efficacy of a Candidate Live-Attenuated Vaccine Derived from the SD-R Strain against NADC34-like Porcine Reproductive and Respiratory Syndrome Virus. Vaccines (Basel) 2023; 11:1349. [PMID: 37631917 PMCID: PMC10459522 DOI: 10.3390/vaccines11081349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 08/04/2023] [Accepted: 08/07/2023] [Indexed: 08/29/2023] Open
Abstract
NADC34-like porcine reproductive and respiratory syndrome virus (PRRSV) strains were first detected in China in 2017 and became major circulating strains in 2021. Our previous study showed that the live-attenuated vaccine candidate SD-R strain could provide broad cross-protection against different NADC30-like PRRSVs (sublineage 1.8). However, the protective effect of SD-R against NADC34-like PRRSV is unclear. Here, a novel NADC34-like PRRSV, LNTZJ1341-2012, was isolated from a pig farm experiencing disease in 2020. Sequence analysis revealed that LNTZJ1341-2012 belonged to PRRSV-2 sublineage 1.5, exhibited the same Nsp2 amino-acid deletion characteristics as IA/2014/NADC34, and had not recombined with other strains. Additionally, a good challenge model was established to evaluate the protection afforded by the candidate SD-R vaccine against infection with a representative NADC34-like strain (LNTZJ1341-2012). The control piglets in the challenge experiment displayed clinical signs typical of PRRSV infection, including transient fever, high viremia, mild clinical symptoms, and histopathological changes in the lungs and submaxillary lymph nodes. In contrast, SD-R vaccination significantly reduced serum and lung tissue viral loads, and vaccinated piglets did not show any clinical symptoms or histopathological changes. Our results demonstrated that LNTZJ1341-2012 is a mildly virulent NADC34-like PRRSV and that the live-attenuated vaccine SD-R can prevent the onset of clinical signs upon challenge with the NADC34-like PRRSV LNTZJ1341-2012 strain, indicating that SD-R is a promising vaccine candidate for the swine industry.
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Affiliation(s)
- Hu Xu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Chao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Bangjun Gong
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Wansheng Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Zhenyang Guo
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Qi Sun
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Jing Zhao
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Lirun Xiang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Jinhao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Yan-Dong Tang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Chaoliang Leng
- Henan Provincial Engineering and Technology Center of Animal Disease Diagnosis and Integrated Control, Nanyang Normal University, Nanyang 473061, China;
| | - Qian Wang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Jinmei Peng
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Guohui Zhou
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Huairan Liu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Tongqing An
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Xuehui Cai
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Zhi-Jun Tian
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
| | - Hongliang Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China; (H.X.); (C.L.); (B.G.); (W.L.); (Z.G.); (Q.S.); (J.Z.); (L.X.); (J.L.); (Y.-D.T.); (Q.W.); (J.P.); (G.Z.); (H.L.); (T.A.); (X.C.); (Z.-J.T.)
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6
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Li W, Li C, Guo Z, Xu H, Gong B, Sun Q, Zhao J, Xiang L, Leng C, Peng J, Zhou G, Tang Y, Liu H, An T, Cai XH, Tian ZJ, Wang Q, Zhang H. Genomic characteristics of a novel emerging PRRSV branch in sublineage 8.7 in China. Front Microbiol 2023; 14:1186322. [PMID: 37323894 PMCID: PMC10264644 DOI: 10.3389/fmicb.2023.1186322] [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: 03/14/2023] [Accepted: 05/15/2023] [Indexed: 06/17/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) has caused serious economic losses to the pig industry worldwide. During the continuous monitoring of PRRSV, a new PRRSV strain type with novel characteristics was first identified in three different regions of Shandong Province. These strains presented a novel deletion pattern (1 + 8 + 1) in the NSP2 region and belonged to a new branch in sublineage 8.7 based on the ORF5 gene phylogenetic tree. To further study the genomic characteristics of the new-branch PRRSV, we selected a sample from each of the three farms for whole-genome sequencing and sequence analysis. Based on the phylogenetic analysis of the whole genome, these strains formed a new independent branch in sublineage 8.7, which showed a close relationship with HP-PRRSV and intermediate PRRSV according to nucleotide and amino acid homology but displayed a completely different deletion pattern in NSP2. Recombinant analysis showed that these strains presented similar recombination patterns, all of which involved recombination with QYYZ in the ORF3 region. Furthermore, we found that the new-branch PRRSV retained highly consistent nucleotides at positions 117-120 (AGTA) of a quite conserved motif in the 3'-UTR; showed similar deletion patterns in the 5'-UTR, 3'-UTR and NSP2; retained characteristics consistent with intermediate PRRSV and exhibited a gradual evolution trend. The above results showed that the new-branch PRRSV strains may have the same origin and be similar to HP-PPRSV also evolved from intermediate PRRSV, but are distinct strains that evolved simultaneously with HP-PRRSV. They persist in some parts of China through rapid evolution, recombine with other strains and have the potential to become epidemic strains. The monitoring and biological characteristics of these strains should be further studied.
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Affiliation(s)
- Wansheng Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chao Li
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhenyang Guo
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hu Xu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Bangjun Gong
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qi Sun
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Jing Zhao
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Lirun Xiang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chaoliang Leng
- Henan Key Laboratory of Insect Biology in Funiu Mountain, Henan Provincial Engineering Laboratory of Insects Bio-Reactor, China-UK-NYNU-RRes Joint Laboratory of Insect Biology, Nanyang Normal University, Nanyang, China
| | - Jinmei Peng
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Guohui Zhou
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yandong Tang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Huairan Liu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Tongqing An
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Xue-Hui Cai
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhi-Jun Tian
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qian Wang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hongliang Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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Tylvalosin Tartrate Improves the Health Status of Swine Herds during Immunization with Porcine Reproductive and Respiratory Syndrome Virus-Inactivated Vaccine. Vet Sci 2022; 10:vetsci10010012. [PMID: 36669013 PMCID: PMC9860778 DOI: 10.3390/vetsci10010012] [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: 11/04/2022] [Revised: 12/19/2022] [Accepted: 12/22/2022] [Indexed: 12/28/2022] Open
Abstract
Porcine reproductive and respiratory syndrome (PRRS) is a devastating disease that affects pigs and is responsible for severe economic losses. The commercial PRRSV-inactivated vaccine (CH-1a strain) in China was recently selected to control PRRS in large populations of PRRS-positive sows and was found to effectively reduce the rate of stillbirth abortion based on clinical observations. However, stress from vaccine inoculation (e.g., fever, anorexia, abortions, and slow body weight gain) usually appears after immunization on many swine farms. In this study, we fed piglets a diet medicated with tylvalosin tartrate during PRRSV-inactivated vaccine immunization. We found that tylvalosin tartrate attenuated the increase in total white blood cells induced by immunization at day one post-immunization (DPI) and induced an increase in monocyte counts after seven DPI. There was also attenuation in the intensity of the inflammatory response induced by vaccination and elevation of serum IFN-γ concentrations at three and seven DPI after immunization. The administration of tylvalosin tartrate could also attenuate the reduction in the percentage of CD8+ T cells induced by PRRSV-inactivated vaccine immunization at seven DPI. These results demonstrated that in addition to tylvalosin tartrate being able to control respiratory and enteric bacterial infections in swine farms, it can also improve the stress status of swine herds during PRRSV-inactivated vaccine immunization.
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Li C, Xu H, Zhao J, Gong B, Sun Q, Xiang L, Li W, Guo Z, Li J, Tang YD, Leng C, Peng J, Wang Q, An T, Cai X, Tian ZJ, Zhou G, Zhang H. Epidemiological investigation and genetic evolutionary analysis of PRRSV-1 on a pig farm in China. Front Microbiol 2022; 13:1067173. [PMID: 36532471 PMCID: PMC9751794 DOI: 10.3389/fmicb.2022.1067173] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 11/17/2022] [Indexed: 07/30/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) has brought serious economic losses to pig industry. PRRSV-1 have existed in China for more than 25 years. The prevalence and features of PRRSV-1 on Chinese farms are unclear. We continuously monitored PRRSV in a pig farm with strict biosafety measures in Henan Province, China, in 2020. The results showed that multiple types of PRRSV coexisted on this single pig farm. PRRSV-1 was one of the main circulating strains on the farm and was responsible for infections throughout nearly the entire epidemic cycle. Phylogenetic analysis showed that PRRSV-1 isolates from this pig farm formed an independent branch, with all isolates belonging to BJEU06-1-like PRRSV. The analysis of selection pressure on ORF5 on this branch identified 5 amino acids as positive selection sites, indicating that PRRSV-1 had undergone adaptive evolution on this farm. According to the analysis of ORF5 of PRRSV-1 on this farm, the evolutionary rate of the BJEU06-1-like branch was estimated to be 1.01 × 10-2 substitutions/site/year. To further understand the genome-wide characteristics of PRRSV-1 on this pig farm, two full-length PRRSV-1 genomes representative of pig farms were obtained. The results of amino acid alignment revealed that although one NSP2 deletion was consistent with BJEU06-1, different new features were found in ORF3 and ORF4. According to the above results, PRRSV-1 has undergone considerable evolution in China. This study is the first to report the prevalence and characteristics of PRRSV-1 on a large farm in mainland China, which will provide a reference for the identification and further prevention and control of PRRSV-1.
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Affiliation(s)
- Chao Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hu Xu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Jing Zhao
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Bangjun Gong
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qi Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Lirun Xiang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Wansheng Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhenyang Guo
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Jinhao Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yan-dong Tang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chaoliang Leng
- Henan Key Laboratory of Insect Biology in Funiu Mountain, Henan Provincial Engineering Laboratory of Insects Bio-Reactor, China-UK-NYNU-RRes Joint Laboratory of Insect Biology, Nanyang Normal University, Nanyang, China
| | - Jinmei Peng
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qian Wang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Tongqing An
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Xuehui Cai
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhi-Jun Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Guohui Zhou
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hongliang Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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Sun Q, Xu H, Li C, Gong B, Li Z, Tian ZJ, Zhang H. Emergence of a novel PRRSV-1 strain in mainland China: A recombinant strain derived from the two commercial modified live viruses Amervac and DV. Front Vet Sci 2022; 9:974743. [PMID: 36157177 PMCID: PMC9505512 DOI: 10.3389/fvets.2022.974743] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/04/2022] [Indexed: 11/27/2022] Open
Abstract
Porcine reproductive and respiratory syndrome virus 1 (PRRSV-1) is one of the main pathogens causing porcine reproductive and respiratory syndrome (PRRS). In recent years, the rate of PRRSV-1 detection in China has gradually increased, and the PRRSV-1 strains reported in China belong to subtype I (Global; Clade A-L). In the present study, a novel PRRSV-1 strain, TZJ2134, was found during epidemiological surveillance of PRRSV-1 in Shandong Province in China. We obtained two fragments of the TZJ2134 genome: TZJ2134-L12 (located at nt 1672-nt 2112 in the partial Nsp2 gene) and TZJ2134-(A+B) (located at nt 7463-nt 11272 in the partial Nsp9, complete Nsp10 and partial Nsp11 genes). Phylogenetic and recombination analyses based on the two sequences showed that TZJ2134 is a recombinant strain derived from two commercial PRRSV-1 modified live vaccine (MLV) strains (the Amervac vaccine and DV vaccine strains) that formed a new recombinant subgroup of DV+Amervac-like isolates with other strains. However, PRRSV-1 MLV is not currently allowed for use in China. This study is the first to detected recombinant PRRSV-1 MLV strain in China and provides new data for the epidemiological study of PRRSV-1 in China. The existence of the TZJ2134 strain is a reminder that the swine surveillance at the Chinese customs should be strengthened.
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Affiliation(s)
- Qi Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hu Xu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chao Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Bangjun Gong
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhen Li
- Pingdingshan Center for Animal Disease Control and Prevention, Pingdingshan, China
| | - Zhi-Jun Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hongliang Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
- *Correspondence: Hongliang Zhang
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