1. Laboratory of Molecular Biology, Clinical Research Institute of Montreal, 110 Pine Avenue West, Montreal, Quebec H2W 1R7, Canada
2. Departments of Medicine
3. Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
4. Institute of Virology, University of Ulm, Ulm, Germany
5. Microbiology and Immunology, Université de Montréal, Montreal, Quebec H3C 3J7, Canada