Chimeric infectious dna clones, chimeric porcine...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/34 (2006.01) A61K 31/7088 (2006.01) A61K 35/76 (2006.01) A61K 38/16 (2006.01) A61K 39/12 (2006.01) A61K 48/00 (2006.01) A61P 31/12 (2006.01) C07K 14/01 (2006.01) C12N 7/01 (2006.01) C12N 7/04 (2006.01)

Patent

CA 2469599

The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2). The new chimeric infectious DNA clone and its derived, a virulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products.

L'invention concerne des clones d'ADN infectieux, des clones d'ADN chimères infectieux de circovirus porcins (PCV), des vaccins et des moyens de protection des porcs contre une infection virale ou le syndrome de dépérissement post-sevrage multisystémique (SDPM) occasionné par le PCV2. Le nouveau clone d'ADN infectieux chimère et son virus chimère avirulent dérivé sont construits à partir du PCV1 non pathogène dans lequel le gène ORF immunogène du PCV2 pathogène remplace un gène du PCV1 non pathogène, de préférence, à la même position. Le virus chimère retient de façon avantageuse le phénotype non pathogène du PCV1, mais élicite les réponses immunitaires spécifiques contre le PCV2 pathogène. L'invention concerne également des produits d'expression de polypeptide immunogène.

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