[1] Univ Zurich Hosp, Inst Expt Immunol, CH-8091 Zurich, Switzerland
[2] Ontario Canc Inst, Campbell Family Inst Breast Canc Res, Toronto, ON M4X 1K9, Canada
[3] Univ Dusseldorf, Dept Gastroenterol Hepatol & Infectiol, D-40225 Dusseldorf, Germany
[4] Univ Dusseldorf, Inst Med Microbiol & Hosp Hyg, D-40225 Dusseldorf, Germany
[5] Kantonal Hosp, Inst Immunobiol, St Gallen, Switzerland
[6] Vrije Univ Amsterdam, Dept Mol Cell Biol, Amsterdam, Netherlands
[7] Ctr Expt & Clin Infect Res, TWINCORE, Hannover, Germany
[8] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Swiss Vaccine Res Inst, Global Hlth Inst, CH-1015 Lausanne, Switzerland
[9] Inst Expt Infect Res, Hannover, Germany