Institution: | Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany,1. Genomic Research Laboratory, Infectious Diseases Service,2. and Department of Microbiology and Molecular Medicine,3. Geneva University Hospitals and the University of Geneva, CH-1211 Geneva 4, Switzerland; and Microbial Genetics, University of Tübingen, Tübingen, Germany4. |