[1] INRA, SAGA, UR Ameliorat Genet Anim 631, BP52627, F-31326 Castanet Tolosan, France
[2] INRA, UR Genet Biochim & Cylogenet 339, F-78352 Jouy En Josas, France
[3] INRA ENV Toulouse, Interact Hotes Agents Pathogenes, F-31076 Toulouse, France
[4] INRA, UE65 Domaine Expt Langlade, F-31450 Montgiscard, France
[5] Ist Super Sanita, Dept Food Safety & Vet Publ Hlth, I-00161 Rome, Italy
[6] INSERM, U567 Inst Cochin, Team 21, F-75014 Paris, France
[7] Univ Paris 05, Fac Med Cochin Port Royale, F-75014 Paris, France