The site of the week is Sanofipasteur.us. Sanofi Pasteur, the vaccines division of sanofi-aventis Group, is the largest company in the world devoted entirely to human vaccines. The first thing you notice when you go to their site is the message, "Welcome to the Web site of sanofi pasteur in the U.S.". Even as a large global company, Sanori Pasteur recognizes the importance of promoting their local presence. Learn More.