Institute of Medical Microbiology, Faculty of Medicine, Justus-Liebig-University, Frankfurter Strasse 107, D-35392 Giessen, Germany. Rohit.Ghai@mikrobio.med.uni-giessen.de|Institute of Medical Microbiology, Faculty of Medicine, Justus-Liebig-University, Frankfurter Strasse 107, D-35392 Giessen, Germany. Rohit.Ghai@mikrobio.med.uni-giessen.de|Institute of Medical Microbiology, Faculty of Medicine, Justus-Liebig-University, Frankfurter Strasse 107, D-35392 Giessen, Germany. Rohit.Ghai@mikrobio.med.uni-giessen.de