Guideline Updates G34: C. diff in 2026: Fidaxomicin First, FMT Reconsidered

An old-rule versus new-rule walk through two documents: the IDSA/SHEA 2021 antibiotic update that made fidaxomicin preferred and demoted metronidazole, and the AGA 2024 guideline that turned fecal microbiota-based therapy into a structured, risk-stratified recommendation whose answer flips entirely on immune status.