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The construction and characterization of vaccinia virus recombinants carrying the nucleocapsid (N) protein gene of human respiratory syncytial (RS) virus are described. Recombinant viruses were constructed that contained the N gene oriented either positively or negatively with respect to the 7.5-kilodalton vaccinia virus promoter. In addition, a positively oriented recombinant was constructed that lacked an out-of-frame AUG codon in the 5'-terminal noncoding region. In HEp-2 cells, both positive-orientation recombinants induced the synthesis of a protein which comigrated with N protein and was precipitated by antisera to RS virus. Sera from mice immunized with these recombinants specifically precipitated the RS virus N protein. Analysis of mRNA and protein expressed from the recombinant N genes showed that deletion of the upstream AUG codon markedly improved the efficiency of protein synthesis. Mice were vaccinated with the high-expressing recombinant and subsequently challenged with live RS virus. The results of these experiments demonstrated that the immune response to N protein afforded a significant degree of protection against RS virus disease.

journal of virology

Recombinant vaccinia viruses carrying the N gene of human respiratory syncytial virus: studies of gene expression in cell culture and immune response in mice