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NCT05960097

A Study on the Safety and Immune Response of Investigational COVID-19 mRNA Vaccines in Healthy Adults

Completed Phase 2 Results posted Last updated 23 October 2025
What this trial tests

Phase 2 trial testing CV0701 mRNA COVID-19 Vaccine (Low dose) in SARS-CoV-2 in 692 participants. Completed in 30 August 2024.

Timeline
1 August 2023
Primary endpoint
30 August 2024
30 August 2024

Quick facts

Lead sponsorGlaxoSmithKline
PhasePhase 2
StatusCompleted
Study typeINTERVENTIONAL
Allocationrandomized
Designparallel
Maskingtriple
Primary purposeprevention
Enrollment692
Start date1 August 2023
Primary completion30 August 2024
Estimated completion30 August 2024
Sites17 locations across United States, Australia

Drugs / interventions tested

Conditions studied

Sponsor

GlaxoSmithKline — full company profile →

Who can join

18 and older, any sex, with SARS-CoV-2 or COVID-19. Patients with the condition only — healthy volunteers not accepted.

Results — posted to ClinicalTrials.gov

Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.

Part A: GMT of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XX Spike Protein Secondary · At Day 91 and Day 181
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)872.5686.0 – 1109.7
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1181.9914.8 – 1527.0
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)1477.71160.4 – 1881.8
Part A: CV0601 mRNA COVID-19 Vaccine1527.81196.7 – 1950.4
Part A: Control Vaccine1155.6896.6 – 1489.3
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)585.0444.3 – 770.3
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)797.0600.2 – 1058.5
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)977.6738.2 – 1294.6
Part A: CV0601 mRNA COVID-19 Vaccine1032.6777.1 – 1372.2
Part A: Control Vaccine734.2546.9 – 985.7
Part A: GMT of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XY Spike Protein Secondary · At Day 91 and Day 181
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)2637.02198.6 – 3162.9
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)3714.03058.0 – 4510.8
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)4284.93566.3 – 5148.4
Part A: CV0601 mRNA COVID-19 Vaccine3952.13281.3 – 4760.0
Part A: Control Vaccine3216.52656.1 – 3895.1
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)2215.81779.5 – 2759.0
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)2935.42342.8 – 3677.9
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)3319.32653.8 – 4151.6
Part A: CV0601 mRNA COVID-19 Vaccine3243.62584.7 – 4070.5
Part A: Control Vaccine2640.62095.6 – 3327.2
Part A: GMT of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XZ Spike Protein Secondary · At Day 29, Day 91 and Day 181
Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)196.0155.1 – 247.7
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)281.5220.6 – 359.3
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)335.0262.4 – 427.6
Part A: CV0601 mRNA COVID-19 Vaccine404.3316.8 – 515.9
Part A: Control Vaccine265.7209.2 – 337.5
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)139.8108.1 – 180.9
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)188.6142.8 – 249.1
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)259.6199.3 – 338.2
Part A: CV0601 mRNA COVID-19 Vaccine259.5199.6 – 337.2
Part A: Control Vaccine194.5148.2 – 255.3
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)105.378.7 – 140.9
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)131.197.3 – 176.7
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)170.2125.7 – 230.5
Part A: CV0601 mRNA COVID-19 Vaccine180.2133.5 – 243.1
Part A: Control Vaccine117.285.9 – 159.7
Part A: Percentage of Participants With Seroresponse of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XX Spike Protein Secondary · At Day 29 compared to baseline (Day 1)

Seroresponse is defined as post-booster titer greater than or equal to (≥) 4 times the lower limit of quantification (LLOQ) when pre-vaccination titer is below LLOQ or a post-booster titer ≥ 4 times the pre-booster titer when pre-vaccination titer is ≥ LLOQ.

GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)38.527.66 – 50.17
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)50.038.14 – 61.86
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)50.738.86 – 62.42
Part A: CV0601 mRNA COVID-19 Vaccine51.439.44 – 63.15
Part A: Control Vaccine48.136.71 – 59.64
Part A: Percentage of Participants With Seroresponse of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XY Spike Protein Secondary · At Day 29 compared to baseline (Day 1)

Seroresponse is defined as post-booster titer ≥ 4 times the lower limit of quantification (LLOQ) when pre-vaccination titer is below LLOQ or a post-booster titer ≥ 4 times the pre-booster titer when pre-vaccination titer is ≥ LLOQ.

GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)17.910.17 – 28.28
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)25.716.22 – 37.16
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)29.319.38 – 40.98
Part A: CV0601 mRNA COVID-19 Vaccine25.716.22 – 37.16
Part A: Control Vaccine35.024.67 – 46.48
Part A: Percentage of Participants With Seroresponse of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XZ Spike Protein Secondary · At Day 29 compared to baseline (Day 1)

Seroresponse is defined as post-booster titer ≥ 4 times the LLOQ when pre-vaccination titer is below LLOQ or a post-booster titer ≥ 4 times the pre-booster titer when pre-vaccination titer is ≥ LLOQ.

GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)39.728.83 – 51.46
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)43.832.24 – 55.95
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)55.443.39 – 66.98
Part A: CV0601 mRNA COVID-19 Vaccine47.335.57 – 59.25
Part A: Control Vaccine47.536.21 – 58.98
Part A: Geometric Mean Increase (GMI) of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XX Spike Protein Secondary · At Day 29, Day 91 and Day 181 compared to baseline (Day 1)

GMI is defined as the the geometric mean of the within participant ratios of the post-dose titer over the pre-dose titer.

Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)2.722.17 – 3.42
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)3.843.03 – 4.87
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)4.563.62 – 5.75
Part A: CV0601 mRNA COVID-19 Vaccine4.773.76 – 6.04
Part A: Control Vaccine3.712.94 – 4.68
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1.691.33 – 2.15
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)2.291.77 – 2.95
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)2.862.24 – 3.64
Part A: CV0601 mRNA COVID-19 Vaccine2.952.31 – 3.77
Part A: Control Vaccine2.231.73 – 2.88
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)0.960.73 – 1.27
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1.310.99 – 1.74
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)1.611.21 – 2.13
Part A: CV0601 mRNA COVID-19 Vaccine1.701.28 – 2.26
Part A: Control Vaccine1.210.90 – 1.62
Part A: GMI of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XY Spike Protein Secondary · At Day 29, Day 91 and Day 181 compared to baseline (Day 1)

GMI is defined as the the geometric mean of the within participant ratios of the post-dose titer over the pre-dose titer.

Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)2.141.79 – 2.55
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)2.682.23 – 3.23
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)3.032.52 – 3.63
Part A: CV0601 mRNA COVID-19 Vaccine3.022.51 – 3.63
Part A: Control Vaccine2.792.33 – 3.34
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1.411.17 – 1.69
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1.981.63 – 2.41
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)2.281.90 – 2.75
Part A: CV0601 mRNA COVID-19 Vaccine2.111.75 – 2.54
Part A: Control Vaccine1.721.42 – 2.08
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1.070.86 – 1.34
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1.421.14 – 1.78
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)1.611.29 – 2.01
Part A: CV0601 mRNA COVID-19 Vaccine1.571.25 – 1.97
Part A: Control Vaccine1.281.02 – 1.61
Part A: GMI of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XZ Spike Protein Secondary · At Day 29, Day 91 and Day 181 compared to baseline (Day 1)

GMI is defined as the the geometric mean of the within participant ratios of the post-dose titer over the pre-dose titer.

Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)2.662.11 – 3.36
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)3.823.00 – 4.88
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)4.553.56 – 5.81
Part A: CV0601 mRNA COVID-19 Vaccine5.494.30 – 7.00
Part A: Control Vaccine3.612.84 – 4.58
Day 91
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1.781.37 – 2.30
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)2.401.82 – 3.17
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)3.302.53 – 4.30
Part A: CV0601 mRNA COVID-19 Vaccine3.302.54 – 4.29
Part A: Control Vaccine2.471.88 – 3.25
Day 181
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1.160.86 – 1.55
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1.441.07 – 1.94
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)1.871.38 – 2.53
Part A: CV0601 mRNA COVID-19 Vaccine1.981.47 – 2.67
Part A: Control Vaccine1.290.94 – 1.76
Part A: Geometric Mean Titer (GMT) of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XX Spike Protein Primary · At Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)1266.71008.1 – 1591.7
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)1786.91409.1 – 2265.9
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)2122.11681.9 – 2677.4
Part A: CV0601 mRNA COVID-19 Vaccine2218.61751.4 – 2810.5
Part A: Control Vaccine1725.51367.6 – 2177.0
Part A: GMT of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XY Spike Protein Primary · At Day 29
GroupValue95% CI
Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)3725.03116.4 – 4452.5
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)4680.63886.5 – 5637.0
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)5275.74397.6 – 6329.1
Part A: CV0601 mRNA COVID-19 Vaccine5261.24368.3 – 6336.5
Part A: Control Vaccine4863.44058.1 – 5828.5
Part B: GMT of Serum Neutralization Titers Against Pseudovirus Bearing SARS-CoV-2 Strain XY Spike Protein Primary · At Day 29
GroupValue95% CI
Part B: CV0801 mRNA COVID-19 Vaccine (Baseline-control Storage Condition)5658.84762.8 – 6723.4
Part B: CV0801 mRNA COVID-19 Vaccine (Intermediate Storage Condition)4889.44097.4 – 5834.5
Part B: CV0801 mRNA COVID-19 Vaccine (Maximum Storage Condition)4629.73892.7 – 5506.2

Adverse events — posted to ClinicalTrials.gov

Time frame: Part A and Part B: Solicited AEs from Day 1 to Day 7; Unsolicited AEs from Day 1 to Day 28; SAEs, MAAEs and AESIs from Day 1 to Day 181. Reporting threshold: 0%. Adverse-event reports describe events observed during the trial — not all are caused by the drug.

Part A: CV0701 mRNA COVID-19 Vaccine (Low Dose)
Serious: 3/87 (3%)
Deaths: 0/87
Part A: CV0701 mRNA COVID-19 Vaccine (Medium Dose)
Serious: 0/84 (0%)
Deaths: 0/84
Part A: CV0701 mRNA COVID-19 Vaccine (High Dose)
Serious: 3/84 (4%)
Deaths: 0/84
Part A: CV0601 mRNA COVID-19 Vaccine
Serious: 1/85 (1%)
Deaths: 0/85
Part A: Control Vaccine
Serious: 3/85 (4%)
Deaths: 0/85
Part B: CV0801 mRNA COVID-19 Vaccine (Maximum Storage Condition)
Serious: 2/86 (2%)
Deaths: 0/86
Part B: CV0801 mRNA COVID-19 Vaccine (Intermediate Storage Condition)
Serious: 2/87 (2%)
Deaths: 0/87
Part B: CV0801 mRNA COVID-19 Vaccine (Baseline-control Storage Condition)
Serious: 4/88 (5%)
Deaths: 0/88

Serious adverse events (20 terms)

ReactionSystemPart A: CV0701 mRNA COVID-…Part A: CV0701 mRNA COVID-…Part A: CV0701 mRNA COVID-…Part A: CV0601 mRNA COVID-…Part A: Control VaccinePart B: CV0801 mRNA COVID-…Part B: CV0801 mRNA COVID-…Part B: CV0801 mRNA COVID-…
Coronary artery diseaseCardiac disorders
Abdominal painGastrointestinal disorders
Gastrooesophageal reflux diseaseGastrointestinal disorders
Biliary colicHepatobiliary disorders
Hepatic cystHepatobiliary disorders
Abscess limbInfections and infestations
EndocarditisInfections and infestations
Infective exacerbation of chronic obstructive airways diseaseInfections and infestations
Ophthalmic herpes simplexInfections and infestations
Rhinovirus infectionInfections and infestations
Joint dislocationInjury, poisoning and procedural complications
Road traffic accidentInjury, poisoning and procedural complications
Invasive ductal breast carcinomaNeoplasms benign, malignant and unspecified (incl cysts and polyps)
Malignant melanoma in situNeoplasms benign, malignant and unspecified (incl cysts and polyps)
SyncopeNervous system disorders
Mixed anxiety and depressive disorderPsychiatric disorders
Suicidal ideationPsychiatric disorders
NephrolithiasisRenal and urinary disorders
UreterolithiasisRenal and urinary disorders
Endometrial hyperplasia with cellular atypiaReproductive system and breast disorders
Other adverse events (128 terms — click to expand)

ReactionSystemPart A: CV0701 mRNA COVID-…Part A: CV0701 mRNA COVID-…Part A: CV0701 mRNA COVID-…Part A: CV0601 mRNA COVID-…Part A: Control VaccinePart B: CV0801 mRNA COVID-…Part B: CV0801 mRNA COVID-…Part B: CV0801 mRNA COVID-…
Injection site painGeneral disorders
FatigueGeneral disorders
HeadacheNervous system disorders
MyalgiaMusculoskeletal and connective tissue disorders
LymphadenopathyBlood and lymphatic system disorders
ArthralgiaMusculoskeletal and connective tissue disorders
COVID-19Infections and infestations
ChillsGeneral disorders
Upper respiratory tract infectionInfections and infestations
VomitingGastrointestinal disorders
FeverGeneral disorders
Injection site erythemaGeneral disorders
Injection site swellingGeneral disorders
CoughRespiratory, thoracic and mediastinal disorders
NauseaGastrointestinal disorders
ToothacheGastrointestinal disorders
Seasonal allergyImmune system disorders
GastroenteritisInfections and infestations
RhinitisInfections and infestations
Urinary tract infectionInfections and infestations
Viral upper respiratory tract infectionInfections and infestations
Iron deficiencyMetabolism and nutrition disorders
Musculoskeletal chest painMusculoskeletal and connective tissue disorders
DizzinessNervous system disorders
DepressionPsychiatric disorders
Rhinitis allergicRespiratory, thoracic and mediastinal disorders
HypertensionVascular disorders
Iron deficiency anaemiaBlood and lymphatic system disorders
PalpitationsCardiac disorders
Ventricular extrasystolesCardiac disorders
Conjunctivitis allergicEye disorders
Abdominal pain upperGastrointestinal disorders
ConstipationGastrointestinal disorders
DiarrhoeaGastrointestinal disorders
Frequent bowel movementsGastrointestinal disorders
Gastrooesophageal reflux diseaseGastrointestinal disorders
Irritable bowel syndromeGastrointestinal disorders
Chest discomfortGeneral disorders
Injection site pruritusGeneral disorders
Non-cardiac chest painGeneral disorders

Most-reported serious reactions: Coronary artery disease, Abdominal pain, Gastrooesophageal reflux disease, Biliary colic, Hepatic cyst, Abscess limb, Endocarditis, Infective exacerbation of chronic obstructive airways disease.

Data from ClinicalTrials.gov NCT05960097 adverse events section.

Sponsor's own description

The purpose of Part A of this study is to assess the immune response and safety of a booster dose of investigational COVID-19 mRNA vaccines in healthy adults. The study will compare the investigational vaccines to control vaccine. The purpose of Part B of this study is to assess the immune response and safety of a booster dose of investigational COVID-19 mRNA vaccines in healthy adults. The study will compare the investigational vaccine under three different storage conditions.

Publications & conference data

5 peer-reviewed publications reference this trial (live from Europe PMC):

  1. Clinical development of therapeutic mRNA applications.
    Żak MM, Zangi L. · · 2025 · cited 28× · PMID 40143545 · DOI 10.1016/j.ymthe.2025.03.034
  2. Advancing mRNA vaccines for infectious diseases: key components, innovations, and clinical progress.
    Li S, Zheng L, Zhong J, Gao X. · · 2025 · cited 8× · PMID 40321006 · DOI 10.1042/ebc20253009
  3. Engineering Lipid Nanoparticles for mRNA Immunotherapy.
    Zwolsman R, Darwish YB, Kluza E, van der Meel R. · · 2025 · cited 8× · PMID 40195623 · DOI 10.1002/wnan.70007
  4. Bioresponsive engineered nanoparticles for immunomodulation.
    Hegde M, Mishra A, Banerjee R, Bintee B, et al · · 2025 · cited 4× · PMID 41162977 · DOI 10.1186/s12916-025-04305-6
  5. Safety and immunogenicity of a modified mRNA-lipid nanoparticle vaccine candidate against COVID-19: Results from a phase 1, dose-escalation study.
    Essink BJ, Shapiro C, Isidro MGD, Bradley P, et al · · 2024 · cited 3× · PMID 39422261 · DOI 10.1080/21645515.2024.2408863

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Primary sources · FDA · ClinicalTrials.gov · EMA · SEC EDGAR · ChEMBL · Wikidata · full sourcing