Microbiology
Spectrum of Activity
Fidaxomicin is a fermentation product obtained from the ActinomyceteDactylosporangium aurantiacum. In vitro, fidaxomicin is active primarily against species of clostridia, including Clostridium difficile.
Mechanism of Action
Fidaxomicin is bactericidal against C. difficile in vitro, inhibiting RNA synthesis by RNA polymerases.