T Bénet1, P Vanhems2. 1. Infection Control and Epidemiology Unit, Hospices Civils de Lyon, Lyon, France; Epidemiology and Public Health Unit, Université Lyon 1, Lyon, France. 2. Infection Control and Epidemiology Unit, Hospices Civils de Lyon, Lyon, France; Epidemiology and Public Health Unit, Université Lyon 1, Lyon, France. Electronic address: philippe.vanhems@chu-lyon.fr.