2 Department of Infectious Diseases, Hospital Universitari de Bellvitge, Institute for Biomedical Research (IDIBELL), l'Hospitalet de Llobregat, Barcelona, Spain; Center for Biomedical Research in Infectious Diseases Network (CIBERINFEC; CB21/13/00009), Instituto de Salud Carlos III, Madrid, Spain. Electronic address: mpuiga@bellvitgehospital.cat.