Overly broad-spectrum antibiotic treatment of wild-type Pseudomonas aeruginosa infections in relation to the EUCAST new definition of susceptibility testing categories, a retrospective multicentre cohort study.

This new definition can cause a negative impact on the use of overly broad-spectrum antibiotic treatment due to misunderstanding by clinicians. Its successful implementation requires adaptation of software for reporting antibiotic susceptibility, a sustained strong information campaign by microbiologists and support by an antimicrobial stewardship team.