[1] Univ Paris Sud, Microbiol Lab, Ctr Hosp Versailles, F-78157 Le Chesnay, France
[2] Ctr Natl Reference Listeria & World Hlth Org Coll, Inst Pasteur, Paris, France
[3] Ctr Natl Reference Resistance Antibiot, Inst Pasteur, Paris, France
[4] Inst Pasteur, Grp Microorganismes & Barrieres Hote, Paris, France
[5] INSERM Avenir U604, Paris, France
[6] Univ Paris 05, Hop Necker Enfants Malad, Assistance Publ Hop Paris, Paris, France