1. Institute of General and Experimental Pathology, University of Vienna, A-1090 Vienna, Austria.
2. Institute of General and Experimental Pathology and Institute of Specific Prophylaxis and Tropical Medicine, University of Vienna, A-1095 Vienna, Austria.
3. First Medical Department, University ofVienna, A-1090 Vienna, Austria.
4. Institute of Microbiology and Genetics, University of Vienna, A-1090 Vienna, Austria.
5. Institute of Clinical Chemistry and Laboratory Diagnostics, University of Vienna, A-1090 Vienna, Austria.