- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05805826
To Understand the Safety and Effects of a C. Difficile Vaccine With New Adds-Ons. It Will Be Given Twice Over a Period of Time to Healthy Adults
A Phase 1/2 Randomized Study to Evaluate the Safety, Tolerability, Immunogenicity, and Immunopersistence of a Clostridioides Difficile Vaccine Administered in a 2-Dose Regimen With Novel Adjuvants in Healthy Adults
An antibody is a substance your body makes to fight off infection. This study will explore the safety and antibody response of a vaccine to prevent severe diarrhea caused by a germ called Clostridoides difficile (C. diff). Three new formulations of the C. diff vaccine will be used in this study, in addition to a C. diff vaccine formulation that has been studied in previous clinical trials.
The purpose of this study is to understand if giving the new C. diff vaccine formulations helps people make as many antibodies as giving the previously studied C. diff vaccine formulation.
The study is divided into 2 phases.
Phase 1 will evaluate 3 new formulations of the C. diff vaccine and 2 dosing schedules spread out over 2 months or 6 months.
The Phase 1 portion of the study is seeking participants:
- who are healthy adults of 65 to 84 years of age
- who have not had a C. diff infection before
- who have not received a C. diff vaccine or C. diff monoclonal antibody therapy before.
All participants in Phase 1 will receive study injections with active vaccine or placebo at each vaccination visit, depending on the vaccine group to which they are assigned. A placebo does not contain any active ingredients. Participants in Phase 1 will attend at least 9 study visits and will take part in the study for approximately 18 months. Based on the results of Phase 1, 1 or 2 of the new C. diff vaccine formulations will be chosen for further study in Phase 2.
Phase 2 will evaluate the safety and effects of the new C. diff vaccine formulation(s) chosen in Phase 1.
The Phase 2 portion of the study is seeking participants:
- who are healthy adults ≥65 years of age
- who have not had a C. diff infection before
- who have not received a C. diff vaccine or C. diff monoclonal antibody therapy before.
All Phase 2 participants will receive active C. diff vaccine or placebo at each vaccination visit. Participants in Phase 2 will attend at least 6 and up to 11 study visits and will take part in the study for approximately 4.5 years.
Study Overview
Status
Conditions
Study Type
Enrollment (Estimated)
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Contact
- Name: Pfizer CT.gov Call Center
- Phone Number: 1-800-718-1021
- Email: ClinicalTrials.gov_Inquiries@pfizer.com
Study Locations
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California
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Anaheim, California, United States, 92801
- Anaheim Clinical Trials, LLC
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Florida
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Hialeah, Florida, United States, 33012
- Indago Research & Health Center, Inc
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Hollywood, Florida, United States, 33024
- Research Centers of America ( Hollywood )
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Miami, Florida, United States, 33165
- New Horizon Research Center
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Pembroke Pines, Florida, United States, 33029
- DBC Research USA
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Pembroke Pines, Florida, United States, 33026
- Private Practice - Dr. Hector Fabregas
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Plantation, Florida, United States, 33322
- BRCR Medical Center Inc.
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Tampa, Florida, United States, 33607
- Clinical Research Trials of Florida
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Minnesota
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Saint Paul, Minnesota, United States, 55114
- Prism Research LLC dba Nucleus Network
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Missouri
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Saint Louis, Missouri, United States, 63110
- Washington University School of Medicine
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New York
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Rochester, New York, United States, 14609
- Rochester Clinical Research, LLC
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
Each phase of the study will enroll participants in different age categories:
Phase 1: Participants ≥65 to <85 years of age; Phase 2: Participants ≥65 years of age.
- Healthy participants as determined by medical history, clinical assessment, and the judgment of the investigator.
- Participants who are willing and able to comply with all scheduled visits, investigational plan, laboratory tests, lifestyle considerations, and other study procedures.
- Capable of giving personally signed informed consent, which includes compliance with the requirements and restrictions listed in the ICD and in this protocol.
Exclusion Criteria:
- Fertile male participants and WOCBP who are unwilling or unable to use an effective method of contraception from the signing of informed consent until at least 28 days after the last dose of study intervention.
- Serious chronic disorder, including history of metastatic malignancy, severe COPD requiring supplemental oxygen, end-stage renal disease with or without dialysis, cirrhosis of the liver, clinically unstable cardiac disease, or any other disorder that, in the investigator's opinion, would make the participant inappropriate for entry into the study.
- Any contraindication to vaccination or vaccine components, including previous hypersensitivity or anaphylactic reaction to any vaccine or vaccine-related components.
- Prior episode of CDI, confirmed by either laboratory test or diagnosis of pseudomembranous colitis at colonoscopy, at surgery, or histopathologically.
- Any bleeding disorder or anticoagulant therapy that would contraindicate intramuscular injection.
- Known or suspected immunodeficiency or other conditions associated with immunosuppression, including, but not limited to, leukocyte, lymphocyte, or immunoglobulin class/subclass deficiencies or abnormalities, generalized malignancy, HIV infection, leukemia, lymphoma, or organ or bone marrow transplant.
- Other medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.
- Previous receipt of an investigational C difficile vaccine or C difficile mAb therapy.
- Receipt of blood product or immunoglobulin within 6 months before enrollment.
- Currently receives treatment with immunosuppressive therapy, including cytotoxic agents or systemic corticosteroids, or planned receipt throughout the study. Participants may not be enrolled if corticosteroids were administered within 28 days before study intervention administration.
- Participation in other studies involving investigational drugs, investigational vaccines, or investigational devices within 28 days prior to study entry through 12 months after the last dose of study intervention.
- Phase 1 only: Any screening hematology and/or blood chemistry laboratory value that meets the definition of a ≥ Grade 1 abnormality.
- Investigator site staff directly involved in the conduct of the study and their family members, site staff otherwise supervised by the investigator, and sponsor and sponsor delegate employees directly involved in the conduct of the study and their family members.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: C. difficile vaccine formulation 2, 2-month schedule (Phase 1)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 3, 2-month schedule (Phase 1)
Novel vaccine formulation 3
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 3 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 1, 6-month schedule (Phase 1)
Novel vaccine formulation 1
|
C. difficile vaccine formulation 1 given as an intramuscular injection
0.9% sodium chloride solution given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 2, 6-month schedule (Phase 1)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 3, 6-month schedule (Phase 1)
Novel vaccine formulation 3
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 3 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 1, 2-month schedule(Phase 1)
Novel vaccine formulation 1
|
C. difficile vaccine formulation 1 given as an intramuscular injection
0.9% sodium chloride solution given as an intramuscular injection
|
Active Comparator: C. difficile vaccine (previously studied formulation) 6-months schedule (Phase 1)
Previously studied C. difficile vaccine formulation
|
0.9% sodium chloride solution given as an intramuscular injection
Toxoid based Clostridioides difficile vaccine (previously studied formulation) given as an intramuscular injection
|
Experimental: C difficile vaccine formulation 2. Schedule 1 with booster (Phase 2)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 2. Schedule 1 (Phase 2)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 2. Schedule 2 with booster (Phase 2)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Experimental: C. difficile vaccine formulation 2. Schedule 2 (Phase 2)
Novel vaccine formulation 2
|
0.9% sodium chloride solution given as an intramuscular injection
C. difficile vaccine formulation 2 given as an intramuscular injection
|
Active Comparator: C. difficile vaccine (previously studied formulation) , 6-month schedule (Phase 2)
Previously studied C. difficile vaccine formulation
|
0.9% sodium chloride solution given as an intramuscular injection
Toxoid based Clostridioides difficile vaccine (previously studied formulation) given as an intramuscular injection
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Phase 1: Percentage of participants reporting local reactions
Time Frame: For 7 days after each vaccination (through Month 6)
|
Injection site pain, redness, and swelling as self-reported in electronic diaries
|
For 7 days after each vaccination (through Month 6)
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Phase 1: Percentage of participants reporting systemic events
Time Frame: For 7 days after each vaccination (through Month 6)
|
Vomiting, diarrhea, headache, fatigue, new or worsening muscle pain, new or worsening joint pain, and fever, as self-reported in electronic diaries
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For 7 days after each vaccination (through Month 6)
|
Phase 1: Percentage of participants reporting adverse events
Time Frame: From Dose 1 (Day 1) through 1 month after the last dose (Month 7)
|
As elicited by investigational site staff
|
From Dose 1 (Day 1) through 1 month after the last dose (Month 7)
|
Phase 1: Percentage of participants reporting serious adverse events
Time Frame: From Dose 1 (Day 1) through 6 months after the last dose (Month 12)
|
As elicited by investigational site staff
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From Dose 1 (Day 1) through 6 months after the last dose (Month 12)
|
Phase 1: Percentage of participants with abnormal hematology and chemistry laboratory values
Time Frame: 1 week after Dose 1 (Day 7) and 1 month after each dose (through Month 7)
|
As measured at the central laboratory
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1 week after Dose 1 (Day 7) and 1 month after each dose (through Month 7)
|
Phase 1: Percentage of participants reporting medically attended adverse events
Time Frame: From Dose 1 (Day 1) through 6 months after the last dose (Month 12)
|
As elicited by investigational site staff
|
From Dose 1 (Day 1) through 6 months after the last dose (Month 12)
|
Phase 2: Percentage of participants reporting local reactions
Time Frame: For 7 days after each dose in the initial vaccination series (through Month 6)
|
Injection site pain, redness, and swelling as self-reported in electronic diaries
|
For 7 days after each dose in the initial vaccination series (through Month 6)
|
Phase 2: Percentage of participants reporting systemic events
Time Frame: For 7 days after each dose in the initial vaccination series (through Month 6)
|
Vomiting, diarrhea, headache, fatigue, new or worsening muscle pain, new or worsening joint pain, and fever, as self-reported in electronic diaries
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For 7 days after each dose in the initial vaccination series (through Month 6)
|
Phase 2: Percentage of participants reporting adverse events
Time Frame: From Dose 1 (Day 1) through 1 month after the last dose of study intervention in the initial vaccination series (through Month 7)
|
As elicited by investigational site staff
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From Dose 1 (Day 1) through 1 month after the last dose of study intervention in the initial vaccination series (through Month 7)
|
Phase 2: Percentage of participants reporting medically attended adverse events
Time Frame: From Dose 1 (Day 1) through 6 months after the last dose of study intervention in the initial vaccination series (through Month 12)
|
As elicited by investigational site staff
|
From Dose 1 (Day 1) through 6 months after the last dose of study intervention in the initial vaccination series (through Month 12)
|
Phase 2: Percentage of participants reporting serious adverse events
Time Frame: From Dose 1 (Day 1) through 6 months after the last dose of study intervention in the initial vaccination series (through Month 12)
|
As elicited by investigational site staff
|
From Dose 1 (Day 1) through 6 months after the last dose of study intervention in the initial vaccination series (through Month 12)
|
Phase 2: Geometric mean concentration (GMC) of C. difficile toxin A- and toxin B-specific neutralizing antibodies
Time Frame: 1 month after the last dose in the initial series (Month 7)
|
As measured at the central laboratory
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1 month after the last dose in the initial series (Month 7)
|
Phase 2: Geometric mean ration (GMR) of C. difficile toxine A- and toxin B- specific neutralizing antibodies
Time Frame: 1 month after the last dose in the initial series (Month 7)
|
As measured at the central laboratory
|
1 month after the last dose in the initial series (Month 7)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before Dose 1 (Day 1) to 1 month after the last dose in the initial vaccination series (Month 7)
|
As measured at the central laboratory
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From before Dose 1 (Day 1) to 1 month after the last dose in the initial vaccination series (Month 7)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Phase 1: Percentage of participants reporting serious adverse events
Time Frame: From 6 month (Month 12) through 12 months after the last dose (Month 18)
|
As elicited by investigational site
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From 6 month (Month 12) through 12 months after the last dose (Month 18)
|
Phase 1: Percentage of participants reporting medically attended adverse events
Time Frame: From 6 month (Month 12) through 12 months after the last dose (Month 18)
|
As elicited by investigational site
|
From 6 month (Month 12) through 12 months after the last dose (Month 18)
|
Phase 1: Geometric mean concentration (GMC) of C. difficile toxin A- and toxin B-specific neutralizing antibodies
Time Frame: 1 month after each dose (through Month 7), 6 months aftre the first and last dose (Months 6 and 12), and 12 months aftre the last dose
|
As measured at the central laboratory
|
1 month after each dose (through Month 7), 6 months aftre the first and last dose (Months 6 and 12), and 12 months aftre the last dose
|
Phase 1: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before Dose 1 (Day 1) to 1 month after each dose (through month 7), and to 6 months and 12 months after the last dose (through Month 18)
|
As measured at the central laboratory
|
From before Dose 1 (Day 1) to 1 month after each dose (through month 7), and to 6 months and 12 months after the last dose (through Month 18)
|
Phase 2: Percentage of participants reporting local reactions
Time Frame: For 7 days after vaccination 5 (Month 13 or 14)
|
Injection site pain, redness, and swelling as self-reported in the electronic diaries
|
For 7 days after vaccination 5 (Month 13 or 14)
|
Phase 2: Percentage of participants reporting systemic events
Time Frame: For 7 days after vaccination 5 (Month 13 or 14)
|
fever, vomiting, diarrhea, headache, fatigue, new or worsening muscle pain, and new or worsening joint pain) as self-reportedin the elctronic diaries
|
For 7 days after vaccination 5 (Month 13 or 14)
|
Phase 2: Percentage of participants reporting adverse events
Time Frame: From vaccination 5 (Month 13 or 14) through 1 month after vaccination 5 (Month 14 or 15)
|
As elicited by the investigational site
|
From vaccination 5 (Month 13 or 14) through 1 month after vaccination 5 (Month 14 or 15)
|
Phase 2: Percentage of participants reporting medically attended adverse events (MAAEs)
Time Frame: From vaccination 5 (Month 13 or 14) through 6 months after vaccination 5 (Month 19 or 20)
|
As elicited by investigational site staff
|
From vaccination 5 (Month 13 or 14) through 6 months after vaccination 5 (Month 19 or 20)
|
Phase 2: Percentage of participants reporting serious adverse events
Time Frame: From vaccination 5 (Month 13 or 14) through 6 months after vaccination 5 (Month 19 or 20)
|
As elicited by investigational site staff
|
From vaccination 5 (Month 13 or 14) through 6 months after vaccination 5 (Month 19 or 20)
|
Phase 2: Percentage of participants reporting medically attended adverse events
Time Frame: From 6 month through 12 months after the last dose (through Month 26)
|
As elicited by investigational site
|
From 6 month through 12 months after the last dose (through Month 26)
|
Phase 2: Percentage of participants reporting serious adverse events
Time Frame: From 6 month through 12 months after the last dose (through Month 26)
|
As elicited by investigational site
|
From 6 month through 12 months after the last dose (through Month 26)
|
Phase 2: Geometric mean concentration (GMC) of C. difficile toxin A- and toxin B-specific neutralizing antibodies
Time Frame: At each planned time point in the initial vaccination series (through Month 7)
|
As measured at the central laboratory
|
At each planned time point in the initial vaccination series (through Month 7)
|
Phase 2: Geometric mean ratio (GMR) of C. difficile toxin A- and toxin B-specific neutralizing antibodies
Time Frame: At each planned time point in the initial vaccination series (through Month 7)
|
As measured at the central laboratory
|
At each planned time point in the initial vaccination series (through Month 7)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before Dose 1 (Day 1) to each planned time point in the initial vaccination series (through Month 7)
|
As measured at the central laboratory
|
From before Dose 1 (Day 1) to each planned time point in the initial vaccination series (through Month 7)
|
Phase 2: The percentage of participants with a greater than or equal to 4-fold rise in C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before Dose 1 (Day 1) to each planned time point in the initial vaccination series (through Month 7)
|
As measured at the central laboratory
|
From before Dose 1 (Day 1) to each planned time point in the initial vaccination series (through Month 7)
|
Phase 2: Geometric mean concentration (GMC) of C. difficile toxin A- and toxin B-specific neutralizing antibodies
Time Frame: At 1 month after vaccination 5 (Month 14 or 15)
|
As measured at the central laboratory
|
At 1 month after vaccination 5 (Month 14 or 15)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before Dose 1 (Day 1) to 1 month after vaccination 5 (Month 14 or 15)
|
As measured at the central laboratory
|
From before Dose 1 (Day 1) to 1 month after vaccination 5 (Month 14 or 15)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before vaccination 5 (Month 13 or 14) to 1 month after vaccnation 5 (Month 14 or 15)
|
As measured at the central laboratory
|
From before vaccination 5 (Month 13 or 14) to 1 month after vaccnation 5 (Month 14 or 15)
|
Phase 2: The percentage of participants with a greater than or equal to 4-fold rise in C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before vaccination (Day 1) to 1 month after vaccination 5 (Month 14 or 15)
|
As measured at the central laboratory
|
From before vaccination (Day 1) to 1 month after vaccination 5 (Month 14 or 15)
|
Phase 2: The percentage of participants with a greater than or equal to 4-fold rise in C. difficile toxin A- and toxin B-specific neutralizing antibody concentrations
Time Frame: From before vaccination 5 (Month 13 or 14) to 1 month after vaccination 5 (Month 14 or 15)
|
As measured at the central laboratory
|
From before vaccination 5 (Month 13 or 14) to 1 month after vaccination 5 (Month 14 or 15)
|
Phase 2: Geometric mean concentration (GMC) of C. difficile toxin A- and toxin B- specific neutralizing antibodies
Time Frame: At each planned persistence time point (Month, 13 or 14, 26, 38, 50)
|
As measured at the central laboratory
|
At each planned persistence time point (Month, 13 or 14, 26, 38, 50)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B- specific neutralizing antibodies
Time Frame: From before vaccination (Day 1), each planned persistence time point (Month 13 or 14, 26, 38, 50)
|
As measured at the central laboratory
|
From before vaccination (Day 1), each planned persistence time point (Month 13 or 14, 26, 38, 50)
|
Phase 2: Geometric mean fold-rise (GMFR) of C. difficile toxin A- and toxin B- specific neutralizing antibodies
Time Frame: From before vaccination 5 (Month 13 or 14), each planned persistence time point (Month 26, 38 and 50)
|
As measured at the central laboratory
|
From before vaccination 5 (Month 13 or 14), each planned persistence time point (Month 26, 38 and 50)
|
Collaborators and Investigators
Sponsor
Investigators
- Study Director: Pfizer CT.gov Call Center, Pfizer
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- C4771001
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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