[1] Univ Hosp St Etienne, Dept Infect Dis, F-42055 St Etienne 2, France
[2] Univ Hosp St Etienne, Immunol Lab, F-42055 St Etienne 2, France
[3] Univ Hosp St Etienne, Virol Lab, F-42055 St Etienne 2, France
[4] Univ St Etienne, PRES Lyon, Grp Immunite Muqueuses & Agents Pathogenes EA, St Etienne, France