ClinicalTrials.gg
CompletedNCT04674189Updated Oct 6, 2023Results posted

A Study to Evaluate the Safety and Immunogenicity of Vaccine CVnCoV in Healthy Adults in Germany for COVID-19

A Phase 3 interventional study of CVnCoV Vaccine and Placebo in Coronavirus, Covid19 and SARS-CoV-2, sponsored by CureVac. Completed at 1 site in Germany. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-10-06.

Sponsored by CureVac (part of BioNTech SE) · Phase 3, Interventional, and Prevention

Phase
Phase 3
Study type
Interventional
Enrollment
2,357
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

This study aims to evaluate the safety (in all participants) and reactogenicity (in a subset of participants) of CVnCoV administered as a 2-dose schedule to adult participants 18 years of age or older. The study also aims to assess antibody responses to the receptor-binding domain (RBD) of spike (S) protein of SARS-CoV-2 after 1 and 2 doses of CVnCoV in adults 18 years of age or older included in a subset of participants.

02

Conditions studied

  • Coronavirus
  • Covid19
  • SARS-CoV-2
  • Severe Acute Respiratory Syndrome

Keywords

  • Vaccine
  • SARS
  • COVID
  • Safety
  • Immunogenicity
03

In context

Coronavirus Infections

1,112 studies on the registry are indexed under Coronavirus Infections; 52 are open to participants now.

This study's enrollment of 2,357 is above the median of 120 across 655 interventional studies indexed under Coronavirus Infections.

Browse Coronavirus Infections studies →

Lead sponsor

CureVac is the lead sponsor of 18 studies on the registry; none are open to participants now.

First submitted before CureVac became part of BioNTech SE.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Male or female participants 18 years of age or older.
  • Health care workers (HCWs), employees or students in clinical training.
  • Provide written prior to initiation of any trial procedures.
  • Expected compliance with protocol procedures and availability for clinical follow-up through the last planned visit.
  • Females of non- defined as follows: surgically sterile (history of bilateral tubal ligation/occlusion, bilateral oophorectomy or hysterectomy) or (defined as amenorrhea for ≥12 consecutive months prior to screening [Day 1] without an alternative medical cause). A follicle-stimulating hormone (FSH) level may be measured at the discretion of the investigator to confirm postmenopausal status.
  • Females of childbearing potential: negative urine pregnancy test (human chorionic gonadotropin within 24 hours prior to each trial vaccination on Day 1 and Day 29.
  • Females of childbearing potential must use highly effective methods of from 2 weeks before the first administration of the trial vaccine until 3 months following the last administration. The following methods of birth control are considered highly effective when used consistently and correctly:

    • Combined (estrogen and progestogen containing) hormonal contraception associated with inhibition of ovulation (oral, intravaginal or transdermal);
    • Progestogen-only hormonal contraception associated with inhibition of ovulation (oral, injectable or implantable);
    • Intrauterine devices (IUDs);
    • Intrauterine hormone-releasing systems (IUSs);
    • Bilateral tubal ligation;
    • Vasectomized partner;
    • Sexual abstinence (periodic abstinence [e.g., calendar, ovulation, symptothermal and post-ovulation methods] and withdrawal are not acceptable).

Exclusion criteria

Exclusion Criteria:

  • History of virologically confirmed SARS-CoV-2 infection or SARS-CoV-2 positive serology.
  • For females: pregnancy or lactation.
  • Use of any or non-registered product (vaccine or drug) within 28 days preceding the administration of the first trial vaccine or planned use during the trial.
  • Receipt of licensed vaccines within 28 days (for ) or 14 days (for inactivated vaccines) prior to the administration of trial vaccine.
  • Prior administration of any investigational SARS-CoV-2 vaccine or other coronavirus (SARS-CoV, MERS-CoV) vaccine or planned use during the trial.
  • Any treatment with or other immune-modifying drugs (including but not limited to , biologicals and methotrexate) for > 14 days total within 6 months preceding the administration of trial vaccine or planned use during the trial. For corticosteroid use, this means prednisone or equivalent, 0.5 mg/kg/day for 14 days or more. The use of inhaled, topical, or localized injections of corticosteroids (e.g., for joint pain/inflammation) is permitted.
  • Any medically diagnosed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination including known infection with (HIV), current diagnosis of or treatment for cancer including leukemia, lymphoma, Hodgkin disease, multiple myeloma or generalized ; chronic renal failure or nephrotic syndrome; and receipt of an organ or bone marrow transplant.
  • Active or chronic disease of, or currently on treatment for, virus (HBV) or virus (HCV).
  • History of angioedema (hereditary or idiopathic), or a history of any anaphylactic reaction.
  • History of Potential immune-mediated disease (pIMD).
  • History of allergy to any component of CVnCoV vaccine.
  • Administration of immunoglobulins or any blood products within 3 months prior to the administration of trial vaccine, or planned receipt during the trial.
  • Participants with a significant acute or chronic medical or psychiatric illness that, in the opinion of the investigator, precludes trial participation (e.g., may increase the risk of trial participation, render the participant unable to meet the requirements of the trial, or may interfere with the participant's trial evaluations). These include severe and/or un-controlled cardiovascular disease, gastrointestinal disease, liver disease, renal disease, respiratory disease, endocrine disorder, and neurological and psychiatric illnesses.
  • Participants with impaired coagulation or any bleeding disorder in whom an intramuscular (IM) injection or a blood draw is . However, those with controlled and stable cases can be included in the trial.
  • Foreseeable non-compliance with protocol as judged by the Investigator.
Terms in these criteria, in plain language(13)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Childbearing potential

Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).

Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.

Postmenopausal

Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Investigational drug or device

A drug or device being studied in a clinical trial.

It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.

Live vaccines

Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.

Immunosuppression

A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.

Read whether the line is about a condition or about medicines, and which medicines and doses it means.

Corticosteroids (steroids)

Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.

Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

Cancer (malignancy)

Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.

Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.

Hepatitis B tests

Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.

Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.

Hepatitis C tests

Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.

After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

05

Study design

Phase
Phase 3
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
2,357 participants (actual)

Study arms

  • Experimental
    CVnCoV: Group 1, Lot 1

    Participants in Group 1 will be vaccinated with CVnCoV 12 µg mRNA on Day 1 and Day 29 in the deltoid area, preferably in the non-dominant arm.

    Biological: CVnCoV Vaccine

  • Experimental
    CVnCoV: Group 2, Lot 2

    Participants in Group 2 will be vaccinated with CVnCoV 12 µg mRNA on Day 1 and Day 29 in the deltoid area, preferably in the non-dominant arm.

    Biological: CVnCoV Vaccine

  • Placebo comparator
    Placebo

    Participants will receive a placebo on Day 1 and Day 29 in the deltoid area, preferably in the non-dominant arm.

    Drug: Placebo

Interventions

  • BiologicalCVnCoV Vaccine

    Intramuscular injection

    Also known as: CV07050101

  • DrugPlacebo

    Intramuscular injection

06

What researchers measure

Primary outcomes

  1. Number of Participants Who Experienced a Medically Attended Adverse Event (AE) Occurring in the Following 6 Months After Dose 2

    Medically attended AEs were defined as AEs with medically attended visits that are not routine visits for physical examination or vaccination, such as visits for hospitalization, an emergency room visit, or an otherwise unscheduled visit to or from medical personnel (medical doctor) for any reason. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

    Time frame: Up to 6 months after Dose 2 (Days 29 to 211)

  2. Number of Participants Who Experienced a Serious Adverse Event (SAE)

    An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

    Time frame: Day 1 to Day 393

  3. Intensity of SAEs Per the Investigator's Assessment

    An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event. The Investigator made an assessment of intensity for each AE reported during the trial and assigned it to one of the following categories: * Mild: an event that was easily tolerated by the participant, causing minimal discomfort and not interfering with everyday activities. * Moderate: an event that caused sufficient discomfort to interfere with normal everyday activities. * Severe: an event that prevented normal everyday activities.

    Time frame: Day 1 to Day 393

  4. Number of Participants Who Experienced an Adverse Event of Special Interest (AESI) Occurring in the Following 1 Year After Dose 2

    The following events were considered and collected as AESI throughout the trial: * AEs with a suspected immune-mediated etiology. * Other AEs relevant to SARS-CoV-2 vaccine development or the target disease. * COVID-19. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

    Time frame: Up to 1 year after Dose 2 (Days 29 to 393)

  5. Number of Participants Who Experienced Death Due to SAE

    An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event.

    Time frame: Day 1 to Day 393

  6. Number of Participants Who Experienced an AE Leading to Vaccine Withdrawal Occurring in the Following 1 Year After Dose 2

    Time frame: Up to 1 year after Dose 2 (Days 29 to 393)

  7. Number of Participants Who Experienced an AE Leading to Trial Discontinuation Occurring in the Following 1 Year After Dose 2

    Time frame: Up to 1 year after Dose 2 (Days 29 to 393)

  8. Number of Participants Who Experienced an Unsolicited AE Occurring on the Day of Vaccination and the Following 28 Days After Any Dose

    eDiaries were used for the collection of unsolicited AEs on each vaccination day and the following 28 days. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

    Time frame: Day 1 to 28 days after Dose 2 (Day 57)

  9. Intensity of Unsolicited AEs Per the Investigator's Assessment Occurring on the Day of Vaccination and the Following 28 Days After Any Dose

    eDiaries were used for the collection of unsolicited AEs on each vaccination day and the following 28 days. The Investigator made an assessment of intensity for each AE reported during the trial and assigned it to one of the following categories: * Mild: an event that was easily tolerated by the participant, causing minimal discomfort and not interfering with everyday activities. * Moderate: an event that caused sufficient discomfort to interfere with normal everyday activities. * Severe: an event that prevented normal everyday activities.

    Time frame: Day 1 to 28 days after Dose 2 (Day 57)

  10. Occurrence of Seroconversion for SARS-CoV-2 Receptor-Binding Domain (RBD) of Spike Protein Antibodies (IgG) on Day 29 and Day 43

    Titers of IgG antibodies directed against the SARS-CoV-2 RBD of Spike Protein antigen were measured by enzyme-linked immunosorbent assay (ELISA). Percentage with 95% confidence interval (CI) of participants for whom a seroconversion was observed is presented by group. Seroconversion was defined as a fold increase above 1 in SARS-CoV-2 Spike Protein RBD IgG antibody levels in participants seronegative at Baseline. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

    Time frame: Baseline (Day 1), Day 29 and Day 43

  11. SARS-CoV-2 RBD of Spike Protein Antibody (IgG) Levels on Days 1, 29 and 43

    Titers of IgG antibodies directed against the SARS-CoV-2 RBD of Spike Protein antigen were measured by ELISA and expressed as geometric mean of titers (GMT) with 95% CI, by group. Individual values below the lower limit of quantification (LLOQ) were set to half of the LLOQ. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

    Time frame: Day 1, Day 29 and Day 43

Secondary outcomes

  1. Occurrence of Seroconversion for SARS-CoV-2 Neutralizing Antibodies on Day 29 and Day 43

    Neutralizing activity of induced antibodies was determined by an activity assay. Percentage with 95% CI of participants for whom a seroconversion was observed is presented by group. Seroconversion was defined as a fold increase above 1 in SARS-CoV-2 neutralizing antibody levels in participants seronegative at Baseline. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

    Time frame: Baseline (Day 1), Day 29 and Day 43

  2. SARS-CoV-2 Neutralizing Antibody Levels on Days 1, 29 and 43

    Neutralizing activity of induced antibodies was determined by an activity assay. GMT with 95% CI of SARS-CoV-2 neutralizing antibody levels is presented by group. Individual values below the LLOQ were set to half of the LLOQ. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

    Time frame: Day 1, Day 29 and Day 43

07

Results

Posted Oct 6, 2023

Participant flow

This trial was performed in Germany between 23 December 2020 and 08 June 2022.

Participant flow — Overall Study
MilestoneCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Started786786785
Safety analysis set783785783
Completed617637372
Not completed169149413
Withdrew: Adverse event001
Withdrew: Received alternative authorized vaccine0117
Withdrew: Physician decision100
Withdrew: Withdrawal by participant8371142
Withdrew: Lost to follow-up555344
Withdrew: Miscellaneous2723207
Withdrew: Did not receive treatment312

Outcome measures

PrimaryNumber of Participants Who Experienced a Medically Attended Adverse Event (AE) Occurring in the Following 6 Months After Dose 2

Medically attended AEs were defined as AEs with medically attended visits that are not routine visits for physical examination or vaccination, such as visits for hospitalization, an emergency room visit, or an otherwise unscheduled visit to or from medical personnel (medical doctor) for any reason. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

Time frame:
Up to 6 months after Dose 2 (Days 29 to 211)
Reported as:
Count of participants · Participants
Number of Participants Who Experienced a Medically Attended Adverse Event (AE) Occurring in the Following 6 Months After Dose 2
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any medically attended AEs9513358
Any related medically attended AEs343213
PrimaryNumber of Participants Who Experienced a Serious Adverse Event (SAE)

An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

Time frame:
Day 1 to Day 393
Reported as:
Count of participants · Participants
Number of Participants Who Experienced a Serious Adverse Event (SAE)
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any SAEs8106
Any related SAEs110
PrimaryIntensity of SAEs Per the Investigator's Assessment

An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event. The Investigator made an assessment of intensity for each AE reported during the trial and assigned it to one of the following categories: * Mild: an event that was easily tolerated by the participant, causing minimal discomfort and not interfering with everyday activities. * Moderate: an event that caused sufficient discomfort to interfere with normal everyday activities. * Severe: an event that prevented normal everyday activities.

Time frame:
Day 1 to Day 393
Reported as:
Count of participants · Participants
Intensity of SAEs Per the Investigator's Assessment
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any mild SAEs000
Any moderate SAEs251
Any severe SAEs655
PrimaryNumber of Participants Who Experienced an Adverse Event of Special Interest (AESI) Occurring in the Following 1 Year After Dose 2

The following events were considered and collected as AESI throughout the trial: * AEs with a suspected immune-mediated etiology. * Other AEs relevant to SARS-CoV-2 vaccine development or the target disease. * COVID-19. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

Time frame:
Up to 1 year after Dose 2 (Days 29 to 393)
Reported as:
Count of participants · Participants
Number of Participants Who Experienced an Adverse Event of Special Interest (AESI) Occurring in the Following 1 Year After Dose 2
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any AESIs14145
Any related AESIs750
PrimaryNumber of Participants Who Experienced Death Due to SAE

An SAE was defined as 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 disability/incapacity. * Was a congenital anomaly/birth defect in the offspring of the participant. * Was an important medical event.

Time frame:
Day 1 to Day 393
Reported as:
Count of participants · Participants
Number of Participants Who Experienced Death Due to SAE
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Number of Participants Who Experienced Death Due to SAE000
PrimaryNumber of Participants Who Experienced an AE Leading to Vaccine Withdrawal Occurring in the Following 1 Year After Dose 2
Time frame:
Up to 1 year after Dose 2 (Days 29 to 393)
Reported as:
Count of participants · Participants
Number of Participants Who Experienced an AE Leading to Vaccine Withdrawal Occurring in the Following 1 Year After Dose 2
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Number of Participants Who Experienced an AE Leading to Vaccine Withdrawal Occurring in the Following 1 Year After Dose 2752
PrimaryNumber of Participants Who Experienced an AE Leading to Trial Discontinuation Occurring in the Following 1 Year After Dose 2
Time frame:
Up to 1 year after Dose 2 (Days 29 to 393)
Reported as:
Count of participants · Participants
Number of Participants Who Experienced an AE Leading to Trial Discontinuation Occurring in the Following 1 Year After Dose 2
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Number of Participants Who Experienced an AE Leading to Trial Discontinuation Occurring in the Following 1 Year After Dose 2101
PrimaryNumber of Participants Who Experienced an Unsolicited AE Occurring on the Day of Vaccination and the Following 28 Days After Any Dose

eDiaries were used for the collection of unsolicited AEs on each vaccination day and the following 28 days. The Investigator assessed the relationship between trial vaccine and occurrence of each AE.

Time frame:
Day 1 to 28 days after Dose 2 (Day 57)
Reported as:
Count of participants · Participants
Number of Participants Who Experienced an Unsolicited AE Occurring on the Day of Vaccination and the Following 28 Days After Any Dose
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any unsolicited AEs245270187
Any related unsolicited AEs18318688
PrimaryIntensity of Unsolicited AEs Per the Investigator's Assessment Occurring on the Day of Vaccination and the Following 28 Days After Any Dose

eDiaries were used for the collection of unsolicited AEs on each vaccination day and the following 28 days. The Investigator made an assessment of intensity for each AE reported during the trial and assigned it to one of the following categories: * Mild: an event that was easily tolerated by the participant, causing minimal discomfort and not interfering with everyday activities. * Moderate: an event that caused sufficient discomfort to interfere with normal everyday activities. * Severe: an event that prevented normal everyday activities.

Time frame:
Day 1 to 28 days after Dose 2 (Day 57)
Reported as:
Count of participants · Participants
Intensity of Unsolicited AEs Per the Investigator's Assessment Occurring on the Day of Vaccination and the Following 28 Days After Any Dose
ParticipantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Any mild unsolicited AEs133149114
Any moderate unsolicited AEs737142
Any severe unsolicited AEs142810
Any unsolicited AEs without intensity assessment252221
PrimaryOccurrence of Seroconversion for SARS-CoV-2 Receptor-Binding Domain (RBD) of Spike Protein Antibodies (IgG) on Day 29 and Day 43

Titers of IgG antibodies directed against the SARS-CoV-2 RBD of Spike Protein antigen were measured by enzyme-linked immunosorbent assay (ELISA). Percentage with 95% confidence interval (CI) of participants for whom a seroconversion was observed is presented by group. Seroconversion was defined as a fold increase above 1 in SARS-CoV-2 Spike Protein RBD IgG antibody levels in participants seronegative at Baseline. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

Time frame:
Baseline (Day 1), Day 29 and Day 43
Reported as:
Number · percentage of participants
Occurrence of Seroconversion for SARS-CoV-2 Receptor-Binding Domain (RBD) of Spike Protein Antibodies (IgG) on Day 29 and Day 43
percentage of participantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2CVnCoV: Pooled Lots 1 and 2Placebo
Day 298.1 (3.6 to 15.3)18.4 (11.3 to 27.5)13.2 (8.8 to 18.7)0.0 (0.0 to 7.4)
Day 4395.5 (88.8 to 98.7)94.2 (87.0 to 98.1)94.8 (90.4 to 97.6)0.0 (0.0 to 8.6)
PrimarySARS-CoV-2 RBD of Spike Protein Antibody (IgG) Levels on Days 1, 29 and 43

Titers of IgG antibodies directed against the SARS-CoV-2 RBD of Spike Protein antigen were measured by ELISA and expressed as geometric mean of titers (GMT) with 95% CI, by group. Individual values below the lower limit of quantification (LLOQ) were set to half of the LLOQ. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

Time frame:
Day 1, Day 29 and Day 43
Reported as:
Geometric mean · GMT
SARS-CoV-2 RBD of Spike Protein Antibody (IgG) Levels on Days 1, 29 and 43
GMTCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2CVnCoV: Pooled Lots 1 and 2Placebo
Day 150.000 (50.000 to 50.000)50.000 (50.000 to 50.000)50.000 (50.000 to 50.000)50.000 (50.000 to 50.000)
Day 2955.145 (51.403 to 59.160)62.236 (56.437 to 68.631)58.566 (55.144 to 62.199)50.000 (50.000 to 50.000)
Day 431285.722 (1003.885 to 1646.683)1151.416 (869.345 to 1525.008)1217.489 (1011.594 to 1465.289)50.000 (50.000 to 50.000)
SecondaryOccurrence of Seroconversion for SARS-CoV-2 Neutralizing Antibodies on Day 29 and Day 43

Neutralizing activity of induced antibodies was determined by an activity assay. Percentage with 95% CI of participants for whom a seroconversion was observed is presented by group. Seroconversion was defined as a fold increase above 1 in SARS-CoV-2 neutralizing antibody levels in participants seronegative at Baseline. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

Time frame:
Baseline (Day 1), Day 29 and Day 43
Reported as:
Number · percentage of participants
Occurrence of Seroconversion for SARS-CoV-2 Neutralizing Antibodies on Day 29 and Day 43
percentage of participantsCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2CVnCoV: Pooled Lots 1 and 2Placebo
Day 292.0 (0.2 to 7.1)2.0 (0.2 to 7.2)2.0 (0.6 to 5.1)0.0 (0.0 to 7.4)
Day 4376.1 (65.9 to 84.6)75.6 (65.1 to 84.2)75.9 (68.8 to 82.0)0.0 (0.0 to 8.6)
SecondarySARS-CoV-2 Neutralizing Antibody Levels on Days 1, 29 and 43

Neutralizing activity of induced antibodies was determined by an activity assay. GMT with 95% CI of SARS-CoV-2 neutralizing antibody levels is presented by group. Individual values below the LLOQ were set to half of the LLOQ. Participants who tested positive for COVID-19 had their data included up to the point of a positive test result. Participants who received a licensed/authorized vaccine were censored at the day after receiving the licensed/authorized vaccine.

Time frame:
Day 1, Day 29 and Day 43
Reported as:
Geometric mean · GMT
SARS-CoV-2 Neutralizing Antibody Levels on Days 1, 29 and 43
GMTCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2CVnCoV: Pooled Lots 1 and 2Placebo
Day 15.000 (5.000 to 5.000)5.000 (5.000 to 5.000)5.000 (5.000 to 5.000)5.000 (5.000 to 5.000)
Day 295.160 (4.906 to 5.427)5.071 (4.972 to 5.172)5.116 (4.980 to 5.256)5.000 (5.000 to 5.000)
Day 4328.846 (21.716 to 38.318)23.976 (18.394 to 31.252)26.327 (21.707 to 31.929)5.000 (5.000 to 5.000)

Adverse events

Collected over Day 1 to Day 393. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
CVnCoV: Group 1, Lot 10/783 (0%)8/783 (1%)542/783 (69.2%)
CVnCoV: Group 2, Lot 20/785 (0%)10/785 (1.3%)547/785 (69.7%)
Placebo1/783 (0.1%)6/783 (0.8%)475/783 (60.7%)
Most frequent serious events
Showing 10 of 27
Most frequent serious events
EventCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
Breast cancerNeoplasms benign, malignant and unspecified (incl cysts and polyps)0/7830/7852/783
Intervertebral disc protrusionMusculoskeletal and connective tissue disorders0/7832/7850/783
ArrhythmiaCardiac disorders1/7830/7850/783
Mechanical ileusGastrointestinal disorders0/7830/7851/783
CholelithiasisHepatobiliary disorders0/7830/7851/783
Small intestine gangreneInfections and infestations0/7830/7851/783
Ligament ruptureInjury, poisoning and procedural complications1/7830/7850/783
Ligament sprainInjury, poisoning and procedural complications0/7830/7851/783
SpondylolisthesisMusculoskeletal and connective tissue disorders1/7830/7850/783
Chronic lymphocytic leukaemiaNeoplasms benign, malignant and unspecified (incl cysts and polyps)1/7831/7850/783
Most frequent other events
Showing 10 of 17
Most frequent other events
EventCVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2Placebo
HeadacheNervous system disorders428/783430/785293/783
FatigueGeneral disorders425/783427/785278/783
Injection site painGeneral disorders387/783390/785160/783
MyalgiaMusculoskeletal and connective tissue disorders344/783341/785136/783
ChillsGeneral disorders276/783275/78581/783
ArthralgiaMusculoskeletal and connective tissue disorders250/783245/78575/783
PyrexiaGeneral disorders218/783221/78561/783
NauseaGastrointestinal disorders140/783132/78565/783
COVID-19Infections and infestations106/78399/785123/783
DiarrhoeaGastrointestinal disorders104/783113/78566/783

Baseline characteristics

Safety Analysis Set: All participants randomized in the trial who received at least one dose of any lot of CVnCoV or placebo vaccine.

Age, Continuous
Age, Continuous(years)CVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2PlaceboTotal
Mean42.2 ± 14.8843.4 ± 14.8042.7 ± 14.5242.7 ± 14.73
Sex: Female, Male
Sex: Female, Male(Participants)CVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2PlaceboTotal
Female5275395211587
Male256246262764
Ethnicity (NIH/OMB)
Ethnicity (NIH/OMB)(Participants)CVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2PlaceboTotal
Hispanic or Latino55414
Not Hispanic or Latino7647597582281
Unknown or Not Reported14212156
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)CVnCoV: Group 1, Lot 1CVnCoV: Group 2, Lot 2PlaceboTotal
White7557657602280
Black or African American2103
Asian1391436
American Indian or Alaska Native0101
Native Hawaiian or Other Pacific Islander2002
Other43512
Unknown or Not Reported76417
08

Study locations

1 site
  • Universitätsmedizin der Johannes-Gutenberg-Universität Mainz Langenbeckstr. 1
    Mainz, 55131, Germany
09

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Oct 6, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT04674189
Lead sponsor
CureVac
Collaborators
German Federal Ministry of Education and Research
Responsible party
Sponsor
First posted
Dec 19, 2020
Start date
Dec 23, 2020
Primary completion
Jun 8, 2022
Completion
Jun 8, 2022
Results posted
Oct 6, 2023
Last update
Oct 6, 2023

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: CVnCoV COVID-19 vaccine

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