Phylogroup stability contrasts with high within sequence type complex dynamics of Escherichia coli bloodstream infection isolates over a 12-year period oleh Guilhem Royer, Mélanie Mercier Darty, Olivier Clermont, Bénédicte Condamine, Cédric Laouenan, Jean-Winoc Decousser, David Vallenet, Agnès Lefort, Victoire de Lastours, Erick Denamur, COLIBAFI and SEPTICOLI groups