1Technische Universität Braunschweig, Institute for Microbiology, Spielmannstr. 7, 38106 Braunschweig, Germany
2Institute of Infection Immunology, TWINCORE, Centre for Experimental and Clinical Infection Research; a joint venture between the Medical School Hannover and the Helmholtz Centre for Infection Research (HZI), Feodor-Lynen-Str. 7, 30625 Hannover, Germany
3Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany