Multiple-Clones of Streptococcus agalactiae harbouring lnuB gene Navegación de entradas Multicenter Study for Defining the Breakpoint for Rifampin Resistance in Neisseria meningitidis by rpoB Sequencing Dissemination of an Erythromycin-Resistant Penicillin-Nonsusceptible Streptococcus pneumoniae Poland6B-20 Clone in Argentina