The progression of Clostridioides difficile infection often follows which sequence?

Study for the PANCE Infectious Disease Test. Dive into flashcards and multiple choice questions, each equipped with hints and detailed explanations. Prepare thoroughly for your exam!

The progression being tested is a toxin-driven sequence starting from gut colonization to progressively more severe inflammation. Antibiotic exposure often disrupts the normal flora, allowing C. difficile to colonize; many people harbor the organism asymptomatically. When toxin production occurs, the colon becomes inflamed and watery diarrhea results. The injury can advance to pseudomembranous colitis, where a fibrinous, inflammatory exudate forms a pseudomembrane on the mucosa. If the inflammation is severe, the colon can dilate (toxic megacolon) and the illness can progress to fulminant colitis with systemic toxicity. This sequence—asymptomatic infection → diarrhea → pseudomembranous colitis → toxic megacolon → fulminant colitis—best matches the typical disease course. The other possibilities don’t reflect this toxin-mediated diarrheal progression and the characteristic severe complications seen with CDI.