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Sanofi Pasteur is the vaccines division of sanofi-aventis Group. It is the largest company in the world devoted entirely to vaccines.
In 2004, Aventis merged with and into Sanofi. The new sanofi-aventis Group became the world's 3rd largest pharmaceutical company. Aventis Pasteur, the vaccine division of sanofi-aventis Group, changed its name to sanofi pasteur.