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The Dutch swine vesicular disease virus (SVDV) isolate NET/1/92 was one of the first isolates belonging to a new SVDV antigenic group. This strain was completely sequenced and was shown to have 93% similarity with the UKG/27/72 isolate. To enable antigenicity, replication, maturation and pathogenicity studies of NET/1/92, an infectious full-length cDNA clone, designated pSVD146, was prepared. The in vitro and in vivo biological properties of the virus derived from pSVD146 were studied by analysing antigenicity, plaque morphology, growth curves and virulence in pigs. The epitopes of newly prepared monoclonal antibodies were roughly mapped by fusion-PCR. Fine mapping of epitopes at the amino acid level was achieved by introducing single amino acid mutations in pSVD146. Two new amino acids important in epitope formation were located in VP1; one was mapped in the C-terminal end and the second is thought to be located in the H-I loop. Growth curve and plaque sizes in vitro were similar between virus derived from pSVD146 and the parent wild-type virus. In virulence studies in pigs, the lesions score, neutralization titres and the seroconversion rates were comparable between virus derived from pSVD146 and the parent strain. Since virus derived from pSVD146 had the same biological properties as the parent strain NET/1/92, the full-length infectious cDNA clone pSVD146 will be very useful in studies of the antigenicity, virulence, pathogenesis, maturation and replication of SVDV.

journal of general virology

Construction of a full-length infectious cDNA clone of swine vesicular disease virus strain NET/1/92 and analysis of new antigenic variants derived from it