2001, Number 2
Evaluation of two bacterinization programs of field-immunized layer-hens by detection of hemagglutination-inhibition antibodies and protection against a controlled-challenge with Haemophilus paragallinarum
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ABSTRACTTwo bacterinization programs of field-immunized layer-hens with bivalent or trivalent infectious coryza bacterins were evaluated by the detection of titers of hemagglutination-inhibition antibodies, and protection against controlled-challenge with A, B and C H. paragallinarum serovars. Bivalent-immunized layer-hens showed lower protection against clinical signs of infectious coryza when serovar A was challenged. Nevertheless, bivalent-immunized layer-hens showed protection and hemagglutination-inhibition antibodies against serovar B. Trivalent-immunized layer-hens showed protection against all three H. paragallinarum serovars. No statistical differences were observed in the hemagglutination-inhibition antibody titers against the same serovar conferred by bivalent or trivalent bacterins. These results indicate that higher hemagglutination-inhibition antibody titers conferred by bivalent or trivalent infectious coryza bacterins could predict protection against a challenge with A, B or C H. paragallinarum serovars.
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