1. Bacteriology Department, Adolfo Lutz Institute, Av. Dr. Arnaldo 351, São Paulo, CEP 01246-902, SP, Brazil
2. Secretariat of Health Surveillance, Ministry of Health, Esplanada dos Ministérios, Bloco G, Brasília, Federal District CEP 70058-900, Brazil
3. Servicio Antimicrobianos, Dpto Bacteriologia, Instituto Nacional de Enfermedades Infecciosas “Dr Carlos G. Malbran”, A. Velez Sarsfield, 563 (1281), Buenos Aires, Argentina