In this episode of Communicable, Erin McCreary and Angela Huttner are joined by Barbara Trautner (St. Louis, USA) and Valéry Lavergne (Vancouver, Canada), the co-chairs and leading authors of the first IDSA guideline on complicated urinary tract infection (cUTI), which was published a few months ago [1]. Together, they discuss the process of developing the guideline from its conception in 2018, the new definition of cUTI, their stepwise approach to clinical decision-making, and some case-by-case scenarios for common antibiotics. They also elaborate on how this guideline compares (and contrasts) to other existing UTI guidelines—including the previous IDSA guideline for UTI [2] —and the clinical need to supply frontline clinicians to identify and distinguish complicated cases from the uncomplicated ones. The episode closes with what essential clinical questions the guests hope to tackle next.  This episode was edited by Kathryn Hostettler and peer reviewed by Maria Ana Flores of Santa Maria Local Health Unit, Lisbon, Portugal.Other resources:European Urologic Association guidelinesUpToDateFDA guidance on complicated UTI ReferencesTrautner BW, et al. Clinical Practice Guideline by Infectious Diseases Society of America (IDSA): 2025 Guideline on Management and Treatment of Complicated Urinary Tract Infections Gupta, K, et al. Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women: 2010 Update by IDSA

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