About the Authors
Centre de Recherche en Infectiologie, Université Laval, Québec, Canada
The authors have declared that no competing interests exist.
Conceived and designed the experiments: ACC JC MO. Performed the experiments: ACC SB AM. Analyzed the data: ACC SB AM PL JC MO. Contributed reagents/materials/analysis tools: SB JC. Wrote the paper: ACC PL MO.