Emergence of Metallo-b-lactamases Navegación de entradas Dissemination of an Erythromycin-Resistant Penicillin-Nonsusceptible Streptococcus pneumoniae Poland6B-20 Clone in Argentina Heterogeneous vancomycin-intermediate susceptibility in a community-associated methicillin-resistant Staphylococcus aureus epidemic clone, in a case of Infective Endocarditis in Argentina