Ceftobiprole is a fifth-generation cephalosporin with activity against MRSA. One-year surveillance at the Regional Hospital of Ancona (Italy) disclosed a 12% ceftobiprole resistance rate (12/102 isolates, MIC ≥4 mg/L). Epidemiological characterization demonstrated that the resistant isolates all belonged to different clones. PBP analysis showed substitutions in all PBPs and a novel insertion in PBP2a. Genes mecB and mecC were not detected. Ceftobiprole susceptibility screening is essential to avoid therapeutic failure and spread of ceftobiprole-resistant strains.
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