- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04537208
Study of Recombinant Protein Vaccine Formulations Against COVID-19 in Healthy Adults 18 Years of Age and Older
September 15, 2025 updated by: Sanofi Pasteur, a Sanofi Company
Immunogenicity and Safety of SARS-CoV-2 Recombinant Protein Vaccine Formulations (With or Without Adjuvant) in Healthy Adults 18 Years of Age and Older
The primary objectives of the study were:
- To describe the neutralizing antibody profile at Day 1, Day 22, and Day 36 of each study intervention group.
- To describe the safety profile of all participants in each age group and each study intervention group up to 12 months post-last injection.
The secondary objectives of the study are:
- To describe binding antibody profile at Day 1, Day 22, Day 36, Day 181 (Cohort 1) or Day 202 (Cohort 2), and Day 366 (Cohort 1) or Day 387 (Cohort 2) of each study intervention group.
- To describe the neutralizing antibody profile at Day 181 (Cohort 1) or Day 202 (Cohort 2) and at Day 366 (Cohort 1) and Day 387 (Cohort 2) of each study intervention group.
- To describe the occurrence of virologically-confirmed coronavirus disease (COVID-19)-like illness and serologically-confirmed severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.
- To evaluate the correlation / association between antibody responses to SARS-CoV-2 Recombinant Protein and the risk of virologically-confirmed COVID-19-like illness and/or serologically-confirmed SARS-CoV-2 infection.
Study Overview
Status
Completed
Conditions
Detailed Description
The duration of each participant's participation in the study was approximately 365 days (Cohort 1) and 386 days (Cohort 2) post last injection.
Study Type
Interventional
Enrollment (Actual)
441
Phase
- Phase 2
- Phase 1
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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Alabama
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Birmingham, Alabama, United States, 35294
- Investigational Site Number 8400004
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California
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Rolling Hills Estates, California, United States, 90274
- Investigational Site Number 8400012
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Florida
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Hollywood, Florida, United States, 33024
- Investigational Site Number 8400011
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Melbourne, Florida, United States, 32934
- Investigational Site Number 8400019
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Massachusetts
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Boston, Massachusetts, United States, 02115
- Investigational Site Number 8400016
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Nebraska
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Omaha, Nebraska, United States, 68134
- Investigational Site Number 8400002
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New York
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Rochester, New York, United States, 14609
- Investigational Site Number 8400001
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Rochester, New York, United States, 14642
- Investigational Site Number 8400007
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Ohio
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Cleveland, Ohio, United States, 44122
- Investigational Site Number 8400008
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Pennsylvania
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Philadelphia, Pennsylvania, United States, 19104
- Investigational Site Number 8400003
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South Carolina
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Mt. Pleasant, South Carolina, United States, 29464
- Investigational Site Number 8400014
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years and older (Adult, Older Adult)
Accepts Healthy Volunteers
Yes
Description
Inclusion Criteria:
- Aged 18 years of age or older on the day of inclusion.
- Informed consent form had been signed and dated.
- Able to attend all scheduled visits and complied with all study procedures.
Exclusion Criteria:
- Participant was pregnant, or lactating, or of childbearing potential and not used an effective method of contraception or abstinence from at least 4 weeks prior to the first vaccination until at least 12 weeks after the last vaccination. To be considered of non-childbearing potential, a female was post-menopausal for at least 1 year or surgically sterile.
- Receipt of any vaccine in the 30 days preceding the first study vaccination or planned receipt of any vaccine in the 30 days following the last study vaccination except for influenza vaccination, which might be received at least 2 weeks before and a minimum of 2 weeks after study vaccines.
- Prior administration of a coronavirus vaccine SARS-CoV-2, SARS-CoV, Middle East Respiratory Syndrome).
- Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months).
- History of SARS-CoV-2 infection, confirmed either clinically, serologically, or microbiologically
- Chronic illness or condition considered to potentially increase the risk for severe COVID illness or that, in the opinion of the Investigator, was at a stage where it might interfere with study conduct or completion.
- Receipt of any therapy known to had in-vitro antiviral activity against SARS-CoV-2 within 72 hours prior to the first blood drew.
- Health care workers provided direct participant care for COVID-19 participants.
The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Quadruple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
|---|---|
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Experimental: Cohort 1: Group 1: SARS-CoV-2 vaccine LD + AF03
Participants received a single intramuscular (IM) injection of SARS-CoV2 vaccine low-dose (LD) formulation along with adjuvant AF03 on Day 1.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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Experimental: Cohort 1: Group 2: SARS-CoV-2 vaccine LD + AS03
Participants received a single IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AS03 on Day 1.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
|
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Experimental: Cohort 1: Group 3: SARS-CoV-2 vaccine HD + AF03
Participants received a single IM injection of SARS-CoV2 vaccine high-dose (HD) formulation along with adjuvant AF03 on Day 1.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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Experimental: Cohort 1: Group 4: SARS-CoV-2 vaccine HD + AS03
Participants received a single IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AS03 on Day 1.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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Placebo Comparator: Cohort 1: Group 5: Placebo
Participants received an IM injection of placebo matching to SARS-CoV2 vaccine on Day 1.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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Experimental: Cohort 2: Group 6: SARS-CoV-2 vaccine LD + AF03
Participants received IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AF03 on Day 1 and Day 22, respectively.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
|
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Experimental: Cohort 2: Group 7: SARS-CoV-2 vaccine LD + AS03
Participants received IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AS03 on Day 1 and Day 22, respectively.
|
Pharmaceutical form: liquid; route of administration: intramuscular injection
|
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Experimental: Cohort 2: Group 8: SARS-CoV-2 vaccine HD + AF03
Participants received IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AF03 on Day 1 and Day 22, respectively.
|
Pharmaceutical form: liquid; route of administration: intramuscular injection
|
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Experimental: Cohort 2: Group 9: SARS-CoV-2 vaccine HD + AS03
Participants received IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AS03 on Day 1 and Day 22, respectively.
|
Pharmaceutical form: liquid; route of administration: intramuscular injection
|
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Experimental: Cohort 2: Group 10: SARS-CoV-2 vaccine HD
Participants received a single IM injection of SARS-CoV2 vaccine HD formulation without adjuvant on Day 1 and Day 22, respectively.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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Placebo Comparator: Cohort 2: Group 11: Placebo
Participants received an IM injection of placebo matching to SARS-CoV2 on Day 1 and Day 22, respectively.
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Pharmaceutical form: liquid; route of administration: intramuscular injection
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Geometric Mean Titers (GMTs) of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 1
Time Frame: Day 1 (pre-vaccination)
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GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Titers were expressed in terms of 1/dilution.
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Day 1 (pre-vaccination)
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Geometric Mean Titers of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 22
Time Frame: Day 22 (post-vaccination)
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GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Titers were expressed in terms of 1/dilution.
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Day 22 (post-vaccination)
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Geometric Mean Titers of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 36
Time Frame: Day 36 (post-vaccination)
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GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Titers were expressed in terms of 1/dilution.
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Day 36 (post-vaccination)
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Geometric Mean Fold-rise (GMFR) of Serum Neutralization Antibody Titers at Day 22
Time Frame: Day 1 (pre-vaccination) and Day 22 (post-vaccination)
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SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Fold-rise was calculated as the ratio of titer values of neutralizing antibodies post-vaccination (Day 22) and pre-vaccination (on Day 1) i.e., Day 22/Day 1.
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Day 1 (pre-vaccination) and Day 22 (post-vaccination)
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Geometric Mean Fold-rise of Serum Neutralization Antibody Titers at Day 36
Time Frame: Day 1 (pre-vaccination) and Day 36 (post-vaccination)
|
SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Fold-rise was calculated as the ratio of titer values of neutralizing antibodies post-vaccination (Day 36) and pre-vaccination (on Day 1) i.e., Day 36/Day 1.
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Day 1 (pre-vaccination) and Day 36 (post-vaccination)
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Number of Participants With >=2-fold and >=4-fold Rise in Serum Neutralization Antibody Titers at Day 22
Time Frame: Day 1 (pre-vaccination) and Day 22 (post-vaccination)
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SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
The fold rise (2-fold and 4-fold) was calculated as the ratio of titer values of neutralizing antibodies post-vaccination (on Day 22) and pre-vaccination (on Day 1) i.e., Day 22/Day 1.
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Day 1 (pre-vaccination) and Day 22 (post-vaccination)
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Number of Participants With >=2-Fold and >=4-Fold Rise in Serum Neutralization Antibody Titer at Day 36
Time Frame: Day 1 (pre-vaccination) and Day 36 (post-vaccination)
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SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
The fold rise (2-fold and 4-fold) was calculated as the ratio of titer values of neutralizing antibodies post-vaccination (on Day 36) and pre-vaccination (on Day 1) i.e., Day 36/Day 1.
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Day 1 (pre-vaccination) and Day 36 (post-vaccination)
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Percentage of Participants Achieving Seroconversion Against SARS-CoV-2 Virus Antigens at Day 22
Time Frame: Day 22 (post-vaccination)
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Seroconversion was defined as participants with a Baseline (Day 1) titer value below lower limit of quantification (LLOQ) with a detectable neutralization antibody titer above assay LLOQ post vaccination (at Day 22).
LLOQ of the neutralization assay was a titer of 10.
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Day 22 (post-vaccination)
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Percentage of Participants Achieving Seroconversion Against SARS-CoV-2 Virus Antigens at Day 36
Time Frame: Day 36 (post-vaccination)
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Seroconversion was defined as participants with a Baseline (Day 1) titer value below LLOQ with a detectable neutralization antibody titer above assay LLOQ post vaccination (at Day 36).
LLOQ of the neutralization assay was a titer of 10.
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Day 36 (post-vaccination)
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Number of Participants With Immediate Unsolicited Adverse Events (AEs)
Time Frame: Within 30 minutes post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])
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An AE was defined as any untoward medical occurrence in a participant who received study vaccine and does not necessary had to have a causal relationship with treatment.
An unsolicited AE was an observed AE that did not fulfill the conditions of solicited reactions prelisted in the case report form (CRF) in terms of diagnosis and/or onset window post-vaccination.
All participants were observed for 30 minutes after vaccination, and any unsolicited systemic AEs occurred during that time were recorded as immediate unsolicited AEs in the CRF.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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Within 30 minutes post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])
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Number of Participants With Solicited Injection Site Reactions
Time Frame: Within 7 days post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])
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A solicited reaction (SR) was defined as an "expected" adverse reaction (AR) (sign or symptom) observed and reported under the conditions (nature and onset) prelisted (i.e., solicited) in the protocol and CRF and considered as related to vaccination.
Solicited injection site reactions included pain, erythema and swelling.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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Within 7 days post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])
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Number of Participants With Solicited Systemic Reactions
Time Frame: Within 7 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])
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An SR was defined as an "expected" AR (sign or symptom) observed and reported under the conditions (nature and onset) prelisted (i.e., solicited) in the protocol and CRF and considered as related to vaccination.
Solicited systemic reactions included fever, headache, malaise and myalgia.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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Within 7 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])
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Number of Participants With Unsolicited Adverse Events
Time Frame: Within 21 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])
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An AE was defined as any untoward medical occurrence in a participant who received study vaccine and does not necessary had to have a causal relationship with treatment.
An unsolicited AE was an observed AE that did not fulfill the conditions of solicited reactions prelisted in the CRF in terms of diagnosis and/or onset post-vaccination.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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Within 21 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])
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Number of Participants With Medically Attended Adverse Events (MAAE)
Time Frame: From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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A MAAE were AEs with a new onset or a worsening of a condition that prompted the participant to seek unplanned medical advice at a physician's office (including phone contact or email) or emergency department.
An AE was defined as any untoward medical occurrence in a participant who received study vaccine and does not necessarily had to have a causal relationship with treatment.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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Number of Participants With Serious Adverse Events (SAE)
Time Frame: From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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An SAE was any untoward medical occurrence that at any dose resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, or was an important medical event.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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Number of Participants With Adverse Events of Special Interest (AESIs)
Time Frame: From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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An AESI (serious or non-serious) was defined as one of scientific and medical concern specific to the Sponsor's product or program, for which ongoing monitoring and rapid communication by the Investigator to the Sponsor was appropriate.
Reported AEs for each arm were presented as pre-specified in the study protocol.
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From Day 1 up to 12 months post last vaccination (i.e., up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2)
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Number of Participants With Laboratory Test Results Based on US FDA Toxicity Grading Guidance
Time Frame: From Day 1 up to 8 days post last dose (i.e., up to Day 9 for Cohort 1 and up to Day 30 for Cohort 2)
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Laboratory tests included hemoglobin (male and female), above and below normal white blood cell, lymphocytes, neutrophils & eosinophils, platelet count, creatinine and blood urea nitrogen, hyponatremia & hypernatremia, hyperkalemia & hypokalemia, hyperglycemia (non-fasting), hypoproteinemia, alkaline phosphate, alanine aminotransferase, aspartate aminotransferase, bilirubin (with any increase in liver function test [LFT], bilirubin (normal in LFT), amylase & lipase, Urine: protein, glucose & blood.
The US FDA Guidance for Industry "Toxicity Grading Scale for Healthy Adults and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials" was used for grading.
As per the guidance, Grade 1 = mild, Grade 2 = moderate and Grade 3 = severe.
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From Day 1 up to 8 days post last dose (i.e., up to Day 9 for Cohort 1 and up to Day 30 for Cohort 2)
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Geometric Mean Concentration (GMC) of Anti-S Binding Antibody at Day 1, 22, 36, 181, 202, 366 and 387
Time Frame: Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
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GMC of Anti-S binding antibodies were assessed using enzyme-linked immunosorbent assay (ELISA) and were measured in binding antibody units/milliliter (BAU/mL).
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Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
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Geometric Mean Fold-rise (GMFR) of Binding Antibody Concentration at Day 22, 36, 181, 202, 366 and 387
Time Frame: Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
|
Binding antibody titers were evaluated by ELISA.
Fold-rise was calculated as the ratio of geometric mean concentrations of antibodies post-vaccination at specified timepoints and pre-vaccination (on Day 1) i.e., Day 22/Day 01, Day 36/Day 01, Day 181/Day 1, Day 202/Day 1, Day 366/Day 1, and Day 387/Day 1.
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Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
|
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Number of Participants With >=2-Fold and >=4- Fold Rise in Anti-S Binding Antibody Concentration at Day 22, 36, 181, 202, 366 and 387
Time Frame: Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
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Binding Antibody Titers were evaluated by ELISA.
Fold rise (2-fold and 4-fold) was calculated as the ratio of titer values for binding antibodies post-vaccination at specified timepoints and pre-vaccination (on Day 1) i.e., Day 22/Day 1 and Day 36/Day 1, Day 181/Day 1, Day 202/Day 1, Day 366/Day 1, and Day 387/Day 1.
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Day 1 (pre-vaccination); Day 22 (post-vaccination), Day 36 (post-vaccination), Day 181 (only for Cohort 1), Day 202 (only for Cohort 2), Day 366 (only for Cohort 1), and Day 387 (only for Cohort 2)
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Geometric Mean Titers of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 181, 202, 366 and 387
Time Frame: Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Titers were expressed in terms of 1/dilution.
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Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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Geometric Mean Fold-rise of Serum Neutralization Antibody Titer at Day 181, 202, 366 and 387
Time Frame: Day 1 (pre-vaccination), Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
Fold-rise was calculated as the ratio of titer values of antibodies post-vaccination at specified timepoints and pre-vaccination (on Day 1) i.e., for Cohort 1: Day 181/Day 1 and Day 366/Day 1; Cohort 2: Day 202/Day 1 and Day 387/Day 1.
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Day 1 (pre-vaccination), Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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Number of Participants With 2-Fold and 4-Fold Rise in Serum Neutralization Antibody Titer at Day 181, 202, 366 and 387
Time Frame: Day 1 (pre-vaccination), Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay.
The fold rise (2-fold and 4-fold) was calculated as the ratio of titer values of antibodies post-vaccination at specified timepoints and pre-vaccination (on Day 1) i.e., Cohort 1: Day 181/Day 1 and Day 366/Day 1 and Cohort 2: Day 202/Day 1 and Day 387/Day 1.
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Day 1 (pre-vaccination), Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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Percentage of Participants Achieving Seroconversion Against SARS-CoV2 Virus Antigens at Day 181, 202, 366 and 387
Time Frame: Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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Seroconversion was defined as participants with a Baseline (Day 1) titer value below LLOQ with a detectable neutralization antibody titer above assay LLOQ post vaccination (Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387).
LLOQ of the neutralization assay was a titer of 10.
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Cohort 1: Day 181 and Day 366 and Cohort 2: Day 202 and Day 387 (post-vaccination)
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Number of Participants With Virologically-confirmed Coronavirus Disease (COVID-19)-Like Illness
Time Frame: Cohort 1: up to Day 366 (post-vaccination) and Cohort 2: up to Day 387 (post-vaccination)
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Virologically-confirmed COVID-19-like illness was defined by specified clinical symptoms and signs and confirmed by positive result for SARS-CoV-2 by nucleic acid amplification test (NAAT) on a respiratory sample in association with a COVID-19-like illness.
The various COVID-19-like illness symptoms were cough, fever, anosmia, ageusia, chillblains, difficulty breathing, shortness of breath, pneumonia, stroke, myocarditis, myocardial infarction, thromboembolic event, purpura fulminans, pharyngitis, chills, myalgia, headache, rhinorrhea, abdominal pain, nausea, diarrhea and vomiting.
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Cohort 1: up to Day 366 (post-vaccination) and Cohort 2: up to Day 387 (post-vaccination)
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Number of Participants With Serologically-confirmed SARS-CoV-2 Infection
Time Frame: Cohort 1: up to Day 366 (post-vaccination) and Cohort 2: up to Day 387 (post-vaccination)
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Serologically-confirmed SARS-CoV-2 infection was defined as a change from negative to positive result in serum for presence of antibodies specific to non-Spike protein of SARS-CoV-2 detected by ELISA assay from any post-baseline sampling time point compared to the Baseline value.
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Cohort 1: up to Day 366 (post-vaccination) and Cohort 2: up to Day 387 (post-vaccination)
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Correlates of Risk / Protection Based on Antibody Responses to SARS-CoV-2
Time Frame: From Day 1 up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2
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Correlate of risk / protection based on antibody responses to SARS-CoV-2 was evaluated using virus neutralization or ELISA, considering virologically-confirmed COVID-19-like illness and/or serologically-confirmed SARS-CoV-2 infection.
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From Day 1 up to Day 366 for Cohort 1 and up to Day 387 for Cohort 2
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Study Director: Clinical Sciences & Operations, Sanofi Pasteur, a Sanofi Company
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
General Publications
- De Rosa SC, Cohen KW, Bonaparte M, Fu B, Garg S, Gerard C, Goepfert PA, Huang Y, Larocque D, McElrath MJ, Morris D, Van der Most R, de Bruyn G, Pagnon A. Whole-blood cytokine secretion assay as a high-throughput alternative for assessing the cell-mediated immunity profile after two doses of an adjuvanted SARS-CoV-2 recombinant protein vaccine candidate. Clin Transl Immunology. 2022 Jan 11;11(1):e1360. doi: 10.1002/cti2.1360. eCollection 2022.
- Goepfert PA, Fu B, Chabanon AL, Bonaparte MI, Davis MG, Essink BJ, Frank I, Haney O, Janosczyk H, Keefer MC, Koutsoukos M, Kimmel MA, Masotti R, Savarino SJ, Schuerman L, Schwartz H, Sher LD, Smith J, Tavares-Da-Silva F, Gurunathan S, DiazGranados CA, de Bruyn G. Safety and immunogenicity of SARS-CoV-2 recombinant protein vaccine formulations in healthy adults: interim results of a randomised, placebo-controlled, phase 1-2, dose-ranging study. Lancet Infect Dis. 2021 Sep;21(9):1257-1270. doi: 10.1016/S1473-3099(21)00147-X. Epub 2021 Apr 19.
Helpful Links
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
September 3, 2020
Primary Completion (Actual)
November 19, 2021
Study Completion (Actual)
November 19, 2021
Study Registration Dates
First Submitted
September 2, 2020
First Submitted That Met QC Criteria
September 2, 2020
First Posted (Actual)
September 3, 2020
Study Record Updates
Last Update Posted (Estimated)
September 17, 2025
Last Update Submitted That Met QC Criteria
September 15, 2025
Last Verified
May 1, 2023
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Respiratory Tract Infections
- Infections
- RNA Virus Infections
- Virus Diseases
- Respiratory Tract Diseases
- Lung Diseases
- Pneumonia, Viral
- Pneumonia
- Coronavirus Infections
- Coronaviridae Infections
- Nidovirales Infections
- COVID-19
- Substandard Drugs
- Pharmaceutical Preparations
- Chemical Actions and Uses
- Crystalloid Solutions
- Isotonic Solutions
- Solutions
- Specialty Uses of Chemicals
- Pharmaceutic Aids
- Counterfeit Drugs
- Saline Solution
- Adjuvants, Pharmaceutic
Other Study ID Numbers
- VAT00001
- U1111-1250-4757 (Other Identifier: UTN)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
YES
IPD Plan Description
Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications.
Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants.
Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Yes
Studies a U.S. FDA-regulated device product
No
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Clinical Trials on COVID-19 (Healthy Volunteers)
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Korea University Guro HospitalKorean Center for Disease Control and PreventionActive, not recruitingCOVID-19 (Healthy Volunteers)Korea, Republic of
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SK Bioscience Co., Ltd.Coalition for Epidemic Preparedness InnovationsCompletedCOVID-19 (Healthy Volunteers)Korea, Republic of
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SK Bioscience Co., Ltd.CompletedCOVID-19 (Healthy Volunteers)Korea, Republic of
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SK Bioscience Co., Ltd.GlaxoSmithKline; Coalition for Epidemic Preparedness InnovationsActive, not recruitingCOVID-19 (Healthy Volunteers)Korea, Republic of
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PharmaJet, Inc.Emory UniversityNot yet recruitingSARS CoV-2 | Evaluate Immune Responses Following mRNA COVID-19 Vaccine Administration Through Different Delivery Routes in Healthy VolunteersUnited States
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AstraZenecaCompletedHealthy Elderly Volunteers | Healthy Young VolunteersUnited States
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Cellivery Therapeutics, Inc.Labcorp Corporation of America Holdings, IncTerminatedHealthy VolunteersUnited States
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Syndax PharmaceuticalsCompletedHealthy Volunteers | Volunteers | Normal Volunteers | Human VolunteersUnited States
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IGM Biosciences, Inc.TerminatedCOVID-19 | Healthy VolunteersSouth Africa
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Syndax PharmaceuticalsCompletedHealthy Volunteers | Volunteers | Normal Volunteers | Human VolunteersUnited States
Clinical Trials on Placebo (0.9% normal saline)
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AbCellera Biologics Inc.RecruitingHealthy VolunteersCanada
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University of Texas Southwestern Medical CenterCompletedAcute BronchiolitisUnited States
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GemVax & KaelCompletedBenign Prostatic Hyperplasia (BPH)Korea, Republic of
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Ann & Robert H Lurie Children's Hospital of ChicagoWithdrawn
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Mayo ClinicWithdrawnHeart Failure | Left Ventricular Assist Device | Natriuretic Peptide
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BioAegis Therapeutics Inc.CompletedCommunity-acquired PneumoniaAustralia, Georgia
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University of HaifaWestern Galilee Hospital-NahariyaRecruiting
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Virginia Commonwealth UniversityUnited States Department of DefenseWithdrawn
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PhytoHealth CorporationRecruitingCancer-related FatigueTaiwan
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Taipei Veterans General Hospital, TaiwanUnknown