High stability of Yellow Fever 17D-204 vaccine: a twelve-year restrospective analysis of large-scale production V. Barban 1 †, Y. Girerd 1 , M. Aguirre 1 , S. Gulia 1 , F. Pétiard 1 , P. Riou 2 , B. Barrere 2 , and J. Lang 1 1 Research Department and 2 Quality Control Development Department, sanofi pasteur, Marcy-l’Etoile, France † corresponding author Correspondance to: V. Barban, Microbiology Research Department, X building, 1541 avenue Marcel Merieux, 69680, Marcy l’Etoile, France (mailto:veronique.barban@sanofipasteur.fr ). Tel: (+33) 4 37 37 37 58. Fax: (+33) 4 37 37 3639. Keywords: yellow fever vaccine, virus stability, vaccine characterization Running title: Characterization of yellow fever vaccine