Abstract: The present invention refers to recombinant Newcastle disease viruses (rNDV) having inserted a transcriptional unit foreign to its genome, which codifies for the synthesis of immunomodulatory proteins. These systems provide excellent protection results and significantly reduce the excreted viral load (post-vaccination and post-challenge) in poultry immunized several weeks after being challenged with a velogenic strain of the Newcastle virus. Additionally, said vaccines allow for the protection of poultry against other pathogenic agents during a long time period as they induce an increase of the immunomodulatory proteins level, which results in an enhancement of the immune response of the host and the development of an efficient humoral and cellular response.

Abstract: The present invention relates to a new Newcastle disease viruses of any genotype and novel fragments of the Newcastle disease virus genome encoding for the F and HN proteins constructed by reverse genetics and recombination, highly antigenic, for preparing vaccines for the prevention of the Newcastle disease by reducing viral shedding or for using as vectors with other viruses, lyophilized or in oil emulsion. Likewise, it can be used as vector in combination with other pathogenic agents.

Abstract: The present invention relates to a new Newcastle disease viruses of any genotype and novel fragments of the Newcastle disease virus genome encoding for the F and HN proteins constructed by reverse genetics and recombination, highly antigenic, for preparing vaccines for the prevention of the Newcastle disease by reducing viral shedding or for using as vectors with other viruses, lyophilized or in oil emulsion. Likewise, it can be used as vector in combination with other pathogenic agents.