To Understand the Safety and Effects of a C. Difficile Vaccine With New Adds-Ons That Will Be Given to Healthy Adults
Public ClinicalTrials.gov record NCT05805826. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A PHASE 1/2 RANDOMIZED STUDY TO EVALUATE THE SAFETY, TOLERABILITY, IMMUNOGENICITY, AND IMMUNOPERSISTENCE OF A CLOSTRIDIOIDES DIFFICILE VACCINE ADMINISTERED WITH NOVEL ADJUVANTS IN HEALTHY ADULTS
Study identification
- NCT ID
- NCT05805826
- Recruitment status
- Active, not recruiting
- Study type
- Interventional
- Phase
- Phase 1, Phase 2
- Lead sponsor
- Pfizer
- Industry
- Enrollment
- 936 participants
Conditions and interventions
Conditions
Interventions
- C. difficile vaccine (previously studied formulation). Biological
- C. difficile vaccine formulation 1. Biological
- C. difficile vaccine formulation 2. Biological
- C. difficile vaccine formulation 3. Biological
- Saline Placebo. Other
Biological · Other
Eligibility (public fields only)
- Age range
- 50 Years and older
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Mar 22, 2023
- Primary completion
- Jun 18, 2031
- Completion
- Jun 18, 2031
- Last update posted
- Apr 28, 2026
2023 – 2031
United States locations
- U.S. sites
- 23
- U.S. states
- 11
- U.S. cities
- 20
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| HOPE Research Institute | Phoenix | Arizona | 85032 | — |
| Anaheim Clinical Trials, LLC | Anaheim | California | 92801 | — |
| Alliance for Multispecialty Research, LLC | Doral | Florida | 33172 | — |
| Indago Research & Health Center, Inc | Hialeah | Florida | 33012 | — |
| Research Centers of America | Hollywood | Florida | 33024 | — |
| Miami Clinical Research | Miami | Florida | 33155 | — |
| New Horizon Research Center | Miami | Florida | 33165 | — |
| Charisma Medical and Research Center | Miami Lakes | Florida | 33014 | — |
| Private Practice - Dr. Hector Fabregas | Pembroke Pines | Florida | 33026 | — |
| DBC Research USA | Pembroke Pines | Florida | 33029 | — |
| BRCR Medical Center Inc. | Plantation | Florida | 33322 | — |
| Clinical Research Trials of Florida | Tampa | Florida | 33607 | — |
| Great Lakes Clinical Trials - Ravenswood | Chicago | Illinois | 60640 | — |
| Alliance for Multispecialty Research, LLC | Wichita | Kansas | 67226 | — |
| Prism Research LLC dba Nucleus Network | Saint Paul | Minnesota | 55114 | — |
| Washington University School of Medicine | St Louis | Missouri | 63110 | — |
| Washington University | St Louis | Missouri | 63130 | — |
| NYU Langone Health | New York | New York | 10016 | — |
| Rochester Clinical Research, Inc. | Rochester | New York | 14609 | — |
| Qcare Site Services Inc. d/b/a Avacare | Durham | North Carolina | 27703 | — |
| CTI Clinical Research Center | Cincinnati | Ohio | 45212 | — |
| Benchmark Research | Austin | Texas | 78705 | — |
| Dynamed Clinical Research, LP d/b/a DM Clinical Research | Tomball | Texas | 77375 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT05805826, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 28, 2026 · Synced May 20, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT05805826 live on ClinicalTrials.gov.