Patent ID: 7517531

Claim:
A tetravalent immunogenic composition comprising a) a first attenuated virus that is immunogenic against dengue serotype 1, b) a second attenuated virus that is immunogenic against dengue serotype 2, c) a third attenuated virus that is immunogenic against dengue serotype 3, and d) a fourth attenuated virus that is immunogenic against dengue serotype 4, wherein each of a), b), c) and d) comprises a nucleic acid comprising i) a first nucleotide sequence encoding at least one structural protein from a first dengue virus, ii) a second nucleotide sequence encoding nonstructural proteins from the first dengue virus or a second dengue virus, and iii) a 3′ untranslated region, wherein the 3′ untranslated region contains a deletion of about 30 nucleotides corresponding to the TL2 stem-loop structure, and wherein both the 3′ untranslated region and the second nucleotide sequence encoding nonstructural proteins are from either the first dengue virus or the second dengue virus; wherein the tetravalent immunogenic composition is not rDEN1/4Δ30, rDEN2/4Δ30, rDEN3/4Δ30, rDEN4Δ30.