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• W2891511009 abstract "Since the outbreak of a new emerging virulent pseudorabies virus mutant in Chinese pig herds, intensive research has been focused on the construction of novel gene deletion vaccine based on the variant virulent viruses. An ideal vaccine candidate is expected to have a balanced safety and immunogenicity. From the infectious clone of PRV AH02LA strain, a TK deletion mutant was generated through two-step Red mutagenesis. After homologous recombination with a transfer vector, a TK&gE dual deficient mutant PRV (PRVΔTK&gE-AH02) was generated, and its structure verified by PCR, RFLP and sequencing. Growth kinetics test showed that PRVΔTK&gE-AH02 reached a titer of 107.5 TCID50 /mL on ST cells. The PRVΔTK&gE-AH02 at a dose of 106.0 TCID50 /animal was not virulent in mice or 1-day-old piglets with maternal PRV antibodies. No clinical signs or virus shedding were detected in 28~ 35-day-old piglets without maternal PRV antibodies after nasal or intramuscular administration with a dose of 106.0 TCID50, although it caused one death of four 1-day-old piglets without maternal PRV antibodies. In the efficiency test of PRVΔTK&gE-AH02, all four 28~ 35-day-old piglets without PRV antibody in the challenge control showed typical clinical symptoms and virus shedding, and two died at 4~ 5 days post challenge. All piglets in 105.0, 104.0 and 103.0 TCID50/dose PRVΔTK&gE-AH02 groups provided complete protection against challenge at only 7 days post intramuscular vaccination. More importantly, PRVΔTK&gE-AH02 stopped virus shedding in these piglets. In contrast, all four piglets in PRV Bartha K61 vaccine group developed high body temperature (≥40.5 °C) and viral shedding, despite they had mild or even no clinical symptoms. The constructed TK&gE dual deletion mutant PRVΔTK&gE-AH02 can reach high titers on ST cells. The live vaccine of PRVΔTK&gE-AH02 is highly safe, and can not only provide clinical protection but also stops virus shedding. This study suggests that PRVΔTK&gE-AH02 might work as a promising vaccine candidate to combat the PRV variant emerging in Chinese herds since 2011." @default.
• W2891511009 created "2018-09-27" @default.
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• W2891511009 date "2018-09-21" @default.
• W2891511009 modified "2023-10-16" @default.
• W2891511009 title "Safety and immunogenicity of an attenuated Chinese pseudorabies variant by dual deletion of TK&gE genes" @default.
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• W2891511009 doi "https://doi.org/10.1186/s12917-018-1536-7" @default.
• W2891511009 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6150974" @default.
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