A complete cDNA clone of the Newcastle disease virus (NDV) vaccine strain H
itchner B1 was constructed, and infectious recombinant virus expressing an
influenza virus hemagglutinin was generated by reverse genetics. The rescue
d virus induces a strong humoral antibody response against influenza virus
and provides complete protection against a lethal dose of influenza virus c
hallenge in mice, demonstrating the potential of recombinant NDV as a vacci
ne vector.