A deletion at the UL/IR junction reduces pseudorabies virus neurovirulence.
A recombinant pseudorabies virus (PRV), designated LLT beta delta 2, which contains a 3-kbp deletion spanning the junction of the unique long and internal repeat sequences was constructed. Compared with the parental strain and a virus rescued for the deleted sequences, LLT beta delta 2 exhibited similar replication characteristics in tissue culture. When inoculated intranasally in swine, LLT beta delta 2 was significantly reduced in virulence and did not produce neurological signs characteristic of PRV infection. LLT beta delta 2 replicated efficiently at the site of inoculation and in peripheral nervous tissues, but replication was restricted in the central nervous system. These results indicate the presence of a PRV neurovirulence determinant in the vicinity of the junction.[1]References
- A deletion at the UL/IR junction reduces pseudorabies virus neurovirulence. Dean, H.J., Cheung, A.K. J. Virol. (1995) [Pubmed]
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