Vaccine containing live virus for therapy of viral diseases...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 7/02 (2006.01) A61K 39/12 (2006.01)

Patent

CA 2132328

A process for preparing a purified virus vaccine comprises the steps of purifying a fluid containing a virus by centrifugation, ultracentrifuging to pellet the supernatant, purifying the virus by sucrose gradient ultracentrifugation, rehydration and lyophilization. Desirably, a modified starch, such as hydroxyethyl starch having a molecular weight in the range 100,000-300,000, is added as a protective colloid prior to lyophilization. The virus is selected from the group consisting of avian paramyxovirus, avian herpesvirus, avian rotavirus, avian bronchitis, avian encephalitis, avian bursitis (Gumboro) virus, Marek's disease virus, parvovirus, Newcastle disease virus, human paramyxovirus, human parvovirus, human adenovirus, and mixtures therof. A purified virus vaccine made by the foregoing method is useful for the treatment and control of mammalian disease of viral origin.

L'invention concerne un procédé de préparation d'un vaccin antiviral purifié qui comprend la purification par centrifugation d'un fluide contenant un virus, une ultracentrifugation en vue de granuler le surnageant, la purification du virus par ultracentrifugation du gradient de glucose, une réhydratation et une lyophilisation. Selon un mode préféré de réalisation, un amidon modifié tel que de l'amidon hydroxyéthyle ayant une masse moléculaire de l'ordre de 100 000 à 300 000, est ajouté avant la lyophilisation en tant que colloïde protecteur. Le virus est sélectionné dans le groupe contenant le paramyxovirus aviaire, l'herpèsvirus aviaire, le rotavirus aviaire, le virus de la bronchite aviaire, le virus de l'encéphalite aviaire, le virus de la bursite aviaire (Gumboro), le virus de la maladie de Marek, le parvovirus, l'adénovirus humain, et des mélanges de ces virus. Un vaccin antiviral purifié obtenu selon ce procédé est utilisé pour traiter et supprimer les maladies d'origine virale chez les mammifères.

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