2 Pathogenesis and control of chronic infections, UMR 1058 INSERM, University Montpellier, Etablissement Français du Sang, Montpellier, France.
3 Pathogenesis and control of chronic infections, UMR 1058 INSERM, University Montpellier, Etablissement Français du Sang, Montpellier, France; Department of Bacterioloy-Virology, CHU Montpellier, Montpellier, France. Electronic address: p-van_de_perre@chu-montpellier.fr.