Characterization of extended spectrum -lactamase producing Escherichia coli: comparison of phylogenetic grouping by the DiversiLab system, mononucleotide motifs and genetic markers T. Vollmer* 1 , C. Knabbe 1 , J. Dreier Bad Oeynhausen, Deutschland Introduction: Rapid and reliable methods to identify the molecular relatedness in clinical isolates are essentially needed to investigate potential routes of transmission.