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Li W, Zhuang D, Li H, Zhao M, Zhu E, Xie B, Chen J, Zhao M. Recombinant pseudorabies virus with gI/gE deletion generated by overlapping polymerase chain reaction and homologous recombination technology induces protection against the PRV variant PRV-GD2013. BMC Vet Res 2021; 17:164. [PMID: 33853597 PMCID: PMC8048318 DOI: 10.1186/s12917-021-02861-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 03/27/2021] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Since 2011, numerous highly virulent and antigenic variant viral strains have been reported in pigs that were vaccinated against the swine pseudorabies virus. These infections have led to substantial economic losses in the Chinese swine industry. RESULTS This study, constructed a novel recombinant vaccine strain with gI/gE deletion (PRV-GD2013-ΔgI/gE) by overlapping PCR and homologous recombination technology. The growth curves and plaque morphology of the recombinant virus were similar to those of the parental strain. However, PRV-GD2013-ΔgI/gE infection was significantly attenuated in mice compared with that of PRV-GD2013. Two-week-old piglets had normal rectal temperatures and displayed no clinical symptoms after being inoculated with 105 TCID50 PRV-GD2013-ΔgI/gE, indicating that the recombinant virus was avirulent in piglets. Piglets were immunized with different doses of PRV-GD2013-ΔgI/gE, or a single dose of Bartha-K61 or DMEM, and infected with PRV-GD2013 at 14 days post-vaccination. Piglets given high doses of PRV-GD2013-ΔgI/gE showed no obvious clinical symptoms, and their antibody levels were higher than those of other groups, indicating that the piglets were completely protected from PRV-GD2013. CONCLUSIONS The PRV-GD2013-ΔgI/gE vaccine strain could be effective for immunizing Chinese swine herds against the pseudorabies virus (PRV) strain.
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Affiliation(s)
- Wenhui Li
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Dijing Zhuang
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Hong Li
- Shandong Qianxi Agriculture & Animal Husbandry Development Co., Ltd., Zaozhuang, China
| | - Mengpo Zhao
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Erpeng Zhu
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Baoming Xie
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Jinding Chen
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Mingqiu Zhao
- College of Veterinary Medicine, South China Agricultural University, 483 Wu Shan Road, Tianhe District, Guangzhou, 510642, Guangdong Province, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.
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