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A chimeric Newcastle disease virus (NDV) vector (NDV/AI4-TFHN) was constructed with the replacement of the ectodomains of the fusion and hemagglutinin-neuraminidase proteins by those from avian paramyxovirus type 2. The chimeric virus induced high antibody response in chickens pre-immunized with NDV. A recombinant vaccine candidate, NDV/AI4-TFHN-H9, expressing the hemagglutinin of H9N2 avian influenza virus, was generated, on the basis of the chimeric NDV vector mentioned above. The NDV/AI4-TFHN-H9 vaccine elicited H9-specific hemagglutination inhibition antibodies in chickens pre-immunized with NDV vaccine, and reduced the numbers of chickens shedding virus after H9N2 challenge. NDV/AI4-TFHN-H9 could serve as an alternative vaccine for the prevention of H9N2 infection in commercial poultry flocks.

Chimeric Newcastle disease virus-vectored vaccine protects chickens against H9N2 avian influenza virus in the presence of pre-existing NDV immunity