[1] CHU Pontchaillou, Serv Bacteriol Virol & Hyg Hosp, F-35033 Rennes, France
[2] Univ Paris 05, Paris, France
[3] Univ Rennes 1, Rennes, France
[4] Cellule Inst Natl Veille Sanit Reg Ouest, Rennes, France
[5] Agence Reg Sante Bretagne, Rennes, France