Abstract
Institute of Medical Microbiology, University Hospital Frankfurt, Paul-Ehrlich-Straße 40, D-60596 Frankfurt, Germany, *Institute of Hygiene, University of Innsbruck, Fritz-Pregl-Straße 3, A-6020 Innsbruck, Austria and †Department of Biological Electron Microscopy, University of Bayreuth, Universitätsstraße 30, D-95440 Bayreuth, Germany and ‡Max von Pettenkofer-Institut für Hygiene und Medizinische Mikrobiologie, Pettenkoferstraße 9a, D-80336 München, Germany
Corresponding author: Dr P. Kraiczy (e-mail: Kraiczy{at}em.uni-frankfurt.de ).