# A Study to Learn About a Clostridioides Difficile Vaccine in People 65 Years of Age and Older

> **NCT07282665** · PHASE3 · RECRUITING · sponsor: **Pfizer** · enrollment: 32000 (estimated)

## Conditions studied

- Clostridioides Difficile Associated Disease

## Interventions

- **BIOLOGICAL:** C.difficile vaccine
- **OTHER:** Saline Placebo

## Key facts

- **NCT ID:** NCT07282665
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** RECRUITING
- **Start date:** 2025-12-10
- **Primary completion:** 2028-12-11
- **Final completion:** 2029-06-07
- **Target enrollment:** 32000 (ESTIMATED)
- **Last updated:** 2026-04-22


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT07282665

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT07282665, "A Study to Learn About a Clostridioides Difficile Vaccine in People 65 Years of Age and Older". Retrieved via AI Analytics 2026-05-28 from https://api.ai-analytics.org/clinical/NCT07282665. Licensed CC0.

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