Production of attenuated respiratory syncytial virus...

C - Chemistry – Metallurgy – 12 – N

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C12N 7/01 (2006.01) A61K 39/155 (2006.01) C07K 14/135 (2006.01) C12N 7/04 (2006.01) C12N 15/45 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2257823

Attenuated respiratory syncytial virus (RSV) and vaccine compositions thereof are produced by introducing specific mutations associated with attenuating phenotypes into wild-type or RSV which is incompletely attenuated by cold- passage or introduction of mutations which produce virus having a temperature sensitive (<u>ts</u>) or cold adapted (<u>ca</u>) phenotype. Alternatively, recombinant RSV and vaccine compositions thereof incorporate attenuating and other mutations specifying desired structural and or phenotypic characteristics in an infectious RSV. Recombinant RSV incorporate desired mutations specified by insertion, deletion, substitution or rearrangement of a selected nucleotide sequence, gene, or gene segment in an infectious RSV clone. The immune system of an individual is stimulated to induce protection against natural RSV infection, or multivalently against infection by RSV and another pathogen, such as PIV, by administration of attenuated, biologically derived or recombinant RSV.

On produit un virus respiratoire syncytial (VRS) et des compositions vaccinales à base dudit virus en introduisant des mutations spécifiques associées à des phénotypes atténuants dans le type sauvage ou VRS. Celui-ci est incomplètement atténué soit par passage au froid, soit par introduction de mutations qui donnent des virus ayant un phénotype sensible à la température (<u>ts</u>) ou adapté au froid (<u>ca</u>). Le VRS recombinant et ses compositions vaccinales peuvent également introduire dans un VRS infectieux des mutations atténuantes ou d'autres mutations spécifiant ses caractéristiques structurelles ou phénotypiques. Le VRS recombinant incorpore les mutations désirées spécifiées par insertion, délétion, substitution ou réarrangement d'une séquence de nucléotides, d'un gène ou d'un segment de gène sélectionné, dans un clone de VRS infectieux. Le système immunitaire d'un individu est stimulé de façon à induire une protection contre l'infection à VRS naturel, ou, de manière plurivalente, contre l'infection à VRS et un autre pathogène, tel le virus para-influenza, par l'administration d'un VRS atténué, biologiquement dérivé ou recombinant.

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