Professor, Dr. Med. Department of Molecular Bacteriology, Helmholtz Centre for Infection Research, Braunschweig, Germany. Department of Molecular Bacteriology, Twincore, Hannover, (DE) and Department of Clinical Microbiology, Rigshospitalet, Copenhagen, (DK) Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany.