Prevalence and characterization of macrolide-lincomycin-streptogramin B-resistant Staphylococcus aureus in Korean hospitals.

DHA-1 is an inducible plasmid-mediated AmpC b-lactamase whose emergence raises concerns because the mortality of patients infected with organisms that produce DHA-1 has been shown to be higher than that of patients infected with organisms that produce CMY-1. In conclusion, we have demonstrated that plasmid-mediated AmpC b-lactamases have emerged in Switzerland. The prevalence of 0.16% is still low. However, the occurrence of DHA-1, an inducible type of enzyme, raises clinical concerns. Additionally, a novel plasmid-mediated AmpC b-lactamase, which was designated CMY-31, was found.