Isolation of different erythromycin-resistance Streptococcus pneumoniae phenotypes in Piemonte Region

The frequency of erythromycin resistance in Streptococcus pneumoniae isolates from human specimens, in different Piemonte Region hospitals between 2005-2007, has been studied. Erythromycin-susceptible isolates were 137/198 and erythromycin-resistant 61/198.Among resistant S. pneumoniae isolates 26/61 belonged to constitutive resistance phenotype, 26/61 to M phenotype and 9/61 to inducible resistance phenotype.