C. Difficile

Clostridioides difficile (C. difficile) is the most common healthcare-associated pathogen, causing \>500,000 infections and \>29,000 deaths per year in the US. Traditional approaches to reduce hospital-onset CDI focus on identifying, isolating, and treating symptomatic patients to prevent transmission to other patients. Recent genomic epidemiology studies, however, suggest that most hospital-onset CDI cases are attributable to asymptomatic carriers who either progress from colonization to active infection themselves or transmit C. difficile to other patients while asymptomatic. This trial will evaluate an intervention to pre-emptively identify asymptomatic C. difficile carriers and then implement a patient-tailored prevention package to protect the carrier from progression to active infection and to prevent transmission from the carrier to other patients.

This study will investigate in healthy study subjects, the safety and tolerability of a controlled infection with Clostridioides difficile, a gut bacterium that can cause diarrhoea. It is also examined which dosing regimen (with or without antibiotic pretreatment) is required to induce mild symptoms (like diarrhoea) in the majority of study subjects and which microbiota and immunological factors influence this. To investigate this, healthy adult study subjects will be asked to ingest capsules (pills) containing the Clostridioides bacterium.