Process for preparing live smallpox vaccine

A - Human Necessities – 61 – K

Patent

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A61K 39/285 (2006.01)

Patent

CA 2662569

Disclosed are: a safer live smallpox vaccine which contains an MSP strain in a reduced amount; and a method for production of the live smallpox vaccine. Specifically, disclosed is a method for production of a live smallpox vaccine, comprising the steps of: inoculating a master seed solution of attenuated vaccinia virus to a proper number of groups (1 to n; n is an integer) of rabbit primary kidney cells and culturing the cells; inoculating a part of the culture of each of the group to a RK-13 cell and a Vero cell, culturing the cells, and selecting and collecting a culture of a group which causes the formation of a plaque in a RK-13 cell but does not cause the formation of any plaque in a Vero cell; and preparing a vaccine stock solution using the culture (a working seed solution). Also specifically disclosed is a live smallpox vaccine prepared by the method.

La présente invention concerne : un vaccin vivant antivariolique à innocuité améliorée qui contient une souche MSP en quantité réduite ; et un procédé de production du vaccin vivant antivariolique. L'invention concerne spécifiquement un procédé de production d'un vaccin vivant antivariolique, comprenant les étapes consistant à : inoculer une solution d'ensemencement mère de virus de la vaccine atténué à un nombre approprié de groupes (1 à n ; n étant un entier) de cellules primaires de rein de lapin et mettre les cellules en culture ; inoculer une partie de la culture de chacun des groupes à une cellule RK-13 et une cellule Vero, mettre les cellules en culture, et sélectionner et recueillir une culture d'un groupe qui entraîne la formation d'une plage dans une cellule RK-13 mais qui n'entraîne la formation d'aucune plage dans une cellule Vero ; et préparer une solution mère de vaccin en utilisant la culture (une solution d'ensemencement de travail). L'invention concerne également spécifiquement un vaccin vivant antivariolique préparé grâce à ce procédé.

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