The microbiome of patients experiencing recurrent CDI is frequently dominated by overgrowths of Enterococcus species This study evaluated the in vitro bactericidal and molecular efficacy of ibezapolstat (IBZ), vancomycin (VAN), and fidaxomicin (FDX) against C. difficile and Enterococcus in standalone and complex co-culture environments These findings demonstrate that Enterococcus creates a protective microenvironment that actively impairs C.