[1] CHU Toulouse, Hop Purpan, Virol Lab, F-31300 Toulouse, France
[2] INSERM, U563, F-31300 Toulouse, France
[3] Univ Toulouse 3, Fac Med Toulouse Purpan, F-31300 Toulouse, France
[4] CHU Toulouse, Hop Purpan, Serv Malad Infect & Trop, F-31300 Toulouse, France