Evaluación de dos protocolos de bacterinización de gallinas de postura, mediante detección de anticuerpos inhibidores de la hemoaglutinación y protección ante un desafío controlado con Haemophilus paragallinarum

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