Vaccine composition against rhodococcus equi

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 1/06 (2006.01) A61K 39/05 (2006.01) A61P 31/04 (2006.01)

Patent

CA 2574516

The invention concerns a method for preparing a soluble antigenic extract fromRhodococcus equi, comprising a step of solubilizing membranes of said bacteria by contacting said bacteria with an extraction solution containing a nonionic detergent of sorbitan polyethylene fatty acid ester type. The invention also concerns a soluble antigenic extract obtainable by said preparation method, said extract comprising membrane antigens of Rhodococcus equi dissolved in the extraction solution. Finally the invention concerns a composition comprising the soluble antigenic extract as medicine, comprising preferably a nanoparticulate or oil-in-water emulsion type adjuvant, and the use of the soluble antigenic extract for preparing a pharmaceutical composition for preventing or treating a Rhodococcus equi -induced infection in an animal.

L'invention a pour objet un procédé de préparation d'un extrait antigénique soluble obtenu à partir de Rhodococcus equi, comprenant une étape de solubilisation des membranes desdites bactéries par mise en contact de ces bactéries avec une solution d'extraction contenant un détergent non ionique de type ester d'acide gras polyoxyéthylénique de sorbitanne. L'invention a également pour objet un extrait antigénique soluble susceptible d'être obtenu à partir du procédé de préparation, ledit extrait comprenant des antigènes membranaires de Rhodococcus equi en solution dans la solution d'extraction. L'invention a finalement pour objet une composition comprenant l'extrait antigénique soluble à titre de médicament, comprenant de préférence un adjuvant de type nanoparticulaire ou émulsion huile-dans-eau, et l'utilisation de l'extrait antigénique soluble pour la préparation d'une composition pharmaceutique destinée à prévenir ou à traiter une infection par Rhodococcus equi chez un mammifère.

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