[1] Hop Lariboisiere, Assistance Publ Hop Paris, Serv Bacteriol Virol, Fac Med, F-75010 Paris 7, France
[2] Hop Bicetre, Assistance Publ Hop Paris, Serv Bacteriol Virol, INSERM Emerging Resistance Antibiot U914,Fac Med, Paris, France
[3] Univ Paris Sud, Paris, France
[4] Univ Paris Diderot, Paris 7, France