1. TWINCORE, Centre for Experimental and Clinical Infection Research, A Joint Venture between the Medical School Hannover (MHH) and the Helmholtz Centre for Infection Research (HZI), Institute of Infection Immunology; Feodor-Lynen-Str. 7 30625 Hannover Germany
2. Lund University, Experimental Medical Science, Immunology Section; Sölvegatan 19 22240 Lund Sweden
3. Danish Technical University, Veterinary Institute, Kemitorvet; Building 202 2870 Kgs. Lyngby Denmark
4. The Rockefeller University; Laboratory of Molecular Immunology; 1230 York Avenue New York NY 10065 USA