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Competitive ELISA and hemagglutination-inhibition (HI) test results after vaccinating with avian influenza virus (AIV) (H9N2) vaccine in chickens
*Days post-innoculation with AIV H9N2 vaccine. †Positive criteria of cELISA: PI value greater than 50. ‡Positive criteria of HI test: greater than 23units. §Number of seroconverted layers/ total number of layers tested.
