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One limitation in the use of regular vaccines against AIV or
NDV is that vaccinated poultry frequently cannot be differentiated
from naturally infected birds, making serological surveillance dif-
ficult to perform. However, vaccination of birds with a bivalent
vaccine like rNDV_F3aa-chimericH7, which induces an immune
response against H7 HA and NDV in chickens, makes serological
surveillance against avian influenza possible because vaccinated
animals lack immune responses against antigens present in whole
influenza. Therefore, our bivalent vaccine would be suitable for use
as a ¡®¡®differentiating infected from vaccinated animals¡¯¡¯ (DIVA)
vaccine. NDV vaccines based on lentogenic strains of NDV are
widely used in poultry. A chimeric NDV_AIV bivalent vaccine
would be administered in the same way as the conventional NDV
vaccines, but would confer protection against both NDV and AIV.

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