Clostridioides difficile suppression via competitive exclusion by defined commensal bacteria

The suppression of *Clostridioides difficile* via competitive exclusion by defined commensal bacteria refers to the prevention of *C. difficile* colonization or infection in the gut by restoring or introducing specific beneficial commensal bacteria. These bacteria prevent *C. difficile* overgrowth by competing for nutrients, producing inhibitory metabolites (such as secondary bile acids), occupying ecological niches, stimulating host immune responses, and in some cases directly neutralizing toxins. Therapeutic approaches that exploit this mechanism include fecal microbiota transplantation and administration of defined live bacterial consortia, which aim to reestablish gut colonization resistance disrupted by antibiotics or disease.

Other names

Competitive exclusion of *Clostridioides difficile*Colonization resistance to *Clostridioides difficile*Gut microbiota-mediated *Clostridioides difficile* suppression

Competitive exclusion of *C. difficile* through nutrient consumption, production of inhibitory metabolites (e.g., secondary bile acids, short-chain fatty acids). Occupation of ecological niches required for *C. difficile* growth. Direct toxin neutralization by secreted bacterial products (e.g., proteolysis of *C. difficile* toxins).