1. Department of Microbiology; University of Würzburg; Biocenter Am Hubland D-97074 Würzburg Germany
2. Institute for Hygiene and Medical Microbiology; Josef-Schneider-Str. 2 Bldg. E1 D-97080 Würzburg Germany
3. Laboratory of Human Bacterial Pathogenesis; Pathogen Molecular Genetics Section; NIAID, NIH; Bethesda MD USA
4. Institute of Medical Microbiology and Hygiene; Elfriede-Aulhorn-Straße 6 D-72076 Tübingen Germany
5. Institute for Molecular Infection Biology; University of Würzburg; Josef-Schneider-Str. 2/D15 D-97080 Würzburg Germany
6. Department of Medical Microbiology and Infection Prevention; University of Groningen; University Medical Center Groningen; Groningen The Netherlands