Bacterial attenuation method and vaccine

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 1/36 (2006.01) A61K 39/02 (2006.01) A61K 39/112 (2006.01) C12N 1/20 (2006.01)

Patent

CA 2094515

Disclosed herein are methods for attenuating virulent Gram negative bacteria to produce avirulent bacteria. The methods comprise passaging the wild-type bacteria through phagocytic cells, such as macrophages or polymorphonuclear leukocytes, or through lysosomes derived from such cells, a sufficient number of times until the bacteria become avirulent to the animal host. The bacteria are preferably from the family Enterobacteracea and most preferably from the genus Salmonellae. The invention further comprises the avirulent bacteria produced by the methods, pure cultures of such bacteria, and methods of using the bacteria, preferably in a vaccine for administering to an animal host to induce an immune response to the wild-type Gram negative bacteria in the host.

Les méthodes faisant l'objet de la présente divulgation servent à atténuer des bactéries Gram-négatif virulentes pour l'obtention de bactéries avirulentes. Les méthodes comprennent le passage de bactéries de type sauvage dans des phagocytes, comme des macrophages ou des polynucléaires neutrophiles ou dans des lysosomes dérivés de ces cellules jusqu'à ce que les bactéries deviennent avirulentes pour l'animal hôte. Les bactéries appartiennent de préférence à la famille des Entérobactériacées et plus particulièrement au genre Salmonella. Le brevet comprend de plus les bactéries avirulentes obtenues par les méthodes, les cultures pures de ces bactéries et les méthodes d'utilisation des bactéries, de préférence dans un vaccin qui sera administré à un animal hôte pour induire une réaction immunitaire à l'égard des bactéries Gram-négatif de type sauvage chez l'hôte.

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