The present invention provides the polypeptide sequences of Avibacterium paragallinarum toxin, its coding nucleic acid sequence, as well as the use of the inventive sequences as a vaccine, antibodies and their use.La présente invention concerne les séquences polypeptidiques dune toxine dAvibacterium paragallinarum, sa séquence codante dacide nucléique, ainsi que lutilisation des séquences de linvention comme vaccin, des anticorps et leur utilisation.