Isolation of three strains of beta-lactamase-producingEnterococcus faecalis in Argentina

Abstract
Of the 90 strains ofEnterococcus spp. isolated in an Argentine laboratory in the period from January to July 1989, three were identified as beta-lactamase-producingEnterococcus faecalis. According to the literature reviewed, these appear to be the first beta-lactamase-positive strains ofEnterococcus isolated outside the USA. They differed from most beta-lactamase-producing strains already described in that they were susceptible to low concentrations of macrolides. All three strains were resistant to high concentrations of aminoglycosides.