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CoV2 preS dTM-AF03

Phase 1

COVID-19 | Monoclonal antibody | Infectious Disease |Sanofi|Trials Updated: Sep 17, 2025

CoV2 preS dTM-AF03 target and mechanism

ModalityMonoclonal antibody

Also known as CoV2 preS dTM-AF03 (low-dose)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment441

FDA Designations

No designations recorded

CoV2 preS dTM-AF03 clinical trials

CoV2 preS dTM-AF03 · 1 trial · 1 indication

Phase 1 1
NCT04537208Study of Recombinant Protein Vaccine Formulations Against COVID-19 in Healthy Adults 18 Years of Age and OlderCOVID-19 (Healthy Volunteers)
COMPLETED441 Analytics
PHASE1COMPLETED
Study of Recombinant Protein Vaccine Formulations Against COVID-19 in Healthy Adults 18 Years of Age and Older
COVID-19 (Healthy Volunteers)Unlock trial analytics

Study Endpoints

Primary Endpoints

Geometric Mean Titers (GMTs) of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 1
Day 1 (pre-vaccination)

GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay. Titers were expressed in terms of 1/dilution.

Geometric Mean Titers of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 22
Day 22 (post-vaccination)

GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay. Titers were expressed in terms of 1/dilution.

Geometric Mean Titers of Neutralizing Antibodies Against SARS-CoV-2 Recombinant Protein Vaccine Formulations at Day 36
Day 36 (post-vaccination)

GMTs of SARS-CoV-2 neutralizing antibodies was measured using a neutralization assay. Titers were expressed in terms of 1/dilution.

Geometric Mean Fold-rise (GMFR) of Serum Neutralization Antibody Titers at Day 22
Day 1 (pre-vaccination) and Day 22 (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 22) and pre-vaccination (on Day 1) i.e., Day 22/Day 1.

Geometric Mean Fold-rise of Serum Neutralization Antibody Titers at Day 36
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.

Number of Participants With >=2-fold and >=4-fold Rise in Serum Neutralization Antibody Titers at Day 22
Day 1 (pre-vaccination) and Day 22 (post-vaccination)

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.

Number of Participants With >=2-Fold and >=4-Fold Rise in Serum Neutralization Antibody Titer at Day 36
Day 1 (pre-vaccination) and Day 36 (post-vaccination)

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.

Percentage of Participants Achieving Seroconversion Against SARS-CoV-2 Virus Antigens at Day 22
Day 22 (post-vaccination)

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.

Percentage of Participants Achieving Seroconversion Against SARS-CoV-2 Virus Antigens at Day 36
Day 36 (post-vaccination)

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.

Number of Participants With Immediate Unsolicited Adverse Events (AEs)
Within 30 minutes post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])

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.

Number of Participants With Solicited Injection Site Reactions
Within 7 days post any and each vaccination (Vaccination 1 [i.e., at Day 1] and 2 [i.e., at Day 22])

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.

Number of Participants With Solicited Systemic Reactions
Within 7 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])

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.

Number of Participants With Unsolicited Adverse Events
Within 21 days post any and each vaccination (Vaccination 1 [i.e., Day 1] and 2 [i.e., Day 22])

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.

Number of Participants With Medically Attended Adverse Events (MAAE)
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)

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.

Number of Participants With Serious Adverse Events (SAE)
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)

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.

Number of Participants With Adverse Events of Special Interest (AESIs)
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)

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.

Number of Participants With Laboratory Test Results Based on US FDA Toxicity Grading Guidance
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)

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.

Secondary Endpoints

Geometric Mean Concentration (GMC) of Anti-S Binding Antibody at Day 1, 22, 36, 181, 202, 366 and 387
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)
Geometric Mean Fold-rise (GMFR) of Binding Antibody Concentration at Day 22, 36, 181, 202, 366 and 387
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)
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
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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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Cohort 1: Group 1: SARS-CoV-2 vaccine LD + AF03EXPERIMENTALParticipants received a single intramuscular (IM) injection of SARS-CoV2 vaccine low-dose (LD) formulation along with adjuvant AF03 on Day 1.
Cohort 1: Group 2: SARS-CoV-2 vaccine LD + AS03EXPERIMENTALParticipants received a single IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AS03 on Day 1.
Cohort 1: Group 3: SARS-CoV-2 vaccine HD + AF03EXPERIMENTALParticipants received a single IM injection of SARS-CoV2 vaccine high-dose (HD) formulation along with adjuvant AF03 on Day 1.
Cohort 1: Group 4: SARS-CoV-2 vaccine HD + AS03EXPERIMENTALParticipants received a single IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AS03 on Day 1.
Cohort 1: Group 5: PlaceboPLACEBO_COMPARATORParticipants received an IM injection of placebo matching to SARS-CoV2 vaccine on Day 1.
Cohort 2: Group 6: SARS-CoV-2 vaccine LD + AF03EXPERIMENTALParticipants received IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AF03 on Day 1 and Day 22, respectively.
Cohort 2: Group 7: SARS-CoV-2 vaccine LD + AS03EXPERIMENTALParticipants received IM injection of SARS-CoV2 vaccine LD formulation along with adjuvant AS03 on Day 1 and Day 22, respectively.
Cohort 2: Group 8: SARS-CoV-2 vaccine HD + AF03EXPERIMENTALParticipants received IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AF03 on Day 1 and Day 22, respectively.
Cohort 2: Group 9: SARS-CoV-2 vaccine HD + AS03EXPERIMENTALParticipants received IM injection of SARS-CoV2 vaccine HD formulation along with adjuvant AS03 on Day 1 and Day 22, respectively.
Cohort 2: Group 10: SARS-CoV-2 vaccine HDEXPERIMENTALParticipants received a single IM injection of SARS-CoV2 vaccine HD formulation without adjuvant on Day 1 and Day 22, respectively.
Cohort 2: Group 11: PlaceboPLACEBO_COMPARATORParticipants received an IM injection of placebo matching to SARS-CoV2 on Day 1 and Day 22, respectively.

Interventions

NameTypeDescription
CoV2 preS dTM-AF03 (low-dose)BIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
CoV2 preS dTM-AF03 (high-dose)BIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
CoV2 preS dTM-AS03 (low-dose)BIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
CoV2 preS dTM-AS03 (high-dose)BIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
CoV2 preS dTM (high-dose) without adjuvantBIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
Placebo (0.9% normal saline)BIOLOGICALPharmaceutical form: liquid; route of administration: intramuscular injection
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites11

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 ...

Countries:United States
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Frequently asked questions about CoV2 preS dTM-AF03

What is CoV2 preS dTM-AF03?

CoV2 preS dTM-AF03 is an investigational COVID-19 vaccine candidate developed by Sanofi. It is a recombinant protein vaccine formulation designed to prevent COVID-19 in healthy adults. The low-dose version is identified as CoV2 preS dTM-AF03 (low-dose). It has been studied in a single Phase 1 clinical trial.

What is CoV2 preS dTM-AF03 used for?

CoV2 preS dTM-AF03 is being developed for the prevention of COVID-19. It was tested in healthy adult volunteers 18 years of age and older. The candidate is intended for immunization against SARS-CoV-2, the virus that causes COVID-19.

Who makes CoV2 preS dTM-AF03?

CoV2 preS dTM-AF03 is developed by Sanofi, which trades under the ticker SNY. Sanofi is the sponsor of the clinical program evaluating this recombinant protein vaccine candidate for COVID-19 prevention.

What phase is CoV2 preS dTM-AF03 in?

CoV2 preS dTM-AF03 is in Phase 1 clinical development. It is an investigational vaccine candidate and has not been approved by the FDA. The Phase 1 trial has been completed, and no active trials are currently listed for this candidate.

What clinical trials is CoV2 preS dTM-AF03 in?

CoV2 preS dTM-AF03 was evaluated in clinical trial NCT04537208, titled Study of Recombinant Protein Vaccine Formulations Against COVID-19 in Healthy Adults 18 Years of Age and Older. The Phase 1 trial enrolled 441 participants in the United States, was randomized, double-blind, and placebo-controlled, and has been completed.

Is CoV2 preS dTM-AF03 the same as CoV2 preS dTM-AF03 (low-dose)?

Yes. CoV2 preS dTM-AF03 (low-dose) is an alternative name for CoV2 preS dTM-AF03. The parenthetical low-dose label distinguishes the lower-dose formulation of the same Sanofi recombinant protein vaccine candidate studied in the Phase 1 COVID-19 trial.