Patent ID: 7951383

Claim:
An isolated infectious, attenuated parainfluenza virus that is obtained by expressing a polynucleotide sequence encoding a partial or complete human PIV genome or antigenome that encodes at least a nucleocapsid (N) protein, a nucleocapsid phosphoprotein (P) and a large polymerase (L) protein of a human PIV and that includes at least one mutation at a position corresponding to a position in the genome of HPIV3 strain JS cp45 selected from the group consisting of Va196 of the N protein, Ser389 of the N protein, Ile96 of the C protein, Pro199 of the M protein, Ile420 of the F protein, Ala450 of the F protein, Val384 of the HN protein, nucleotide 23 of the 3′ leader sequence, nucleotide 24 of the 3′ leader sequence, nucleotide 28 of the 3′ leader sequence, nucleotide 45 of the 3′ leader sequence and nucleotide 62 in the N gene start sequence in a cell, wherein the human PIV genome or antigenome is a chimeric PIV genome or antigenome comprising a polynucleotide sequence of a background partial or complete PIV genome or antigenome and at least one heterologous PIV sequence selected from a human parainfluenza virus type 1 (HPIV 1) sequence, a human parainfluenza virus type 2 (HPIV 2) sequence, a human parainfluenza virus type 3 (HPIV 3) sequence, a bovine parainfluenza virus (BPIV) sequence or a murine parainfluenza virus (MPIV) sequence, wherein the genome or antigenome further includes a mutation at the amino acid corresponding to Phe456 of the L protein of wild-type HPIV3.