What this study is
This early-stage study will look at a new mRNA vaccine that combines defenses against both seasonal flu and COVID-19 in terms of its safety and how it builds protection. Healthy adults aged 65 to 85 will receive different doses of this new vaccine, a standard flu vaccine, or COVID-19 vaccine. The study will assess any side effects or health issues, and additional blood samples will be collected at specific times to evaluate how well participants bodies build protection against the flu and COVID-19.
What's being tested
- Investigational mRNA Seasonal Flu/COVID-19 Combination (Flu/COVm) Vaccine
Intervention · BIOLOGICAL
Flu/COVm Vaccine with multiple dose levels (Dose Level 1, Dose Level 2, and Dose Level 3), will be administered via single intramuscular injection.
- Licensed Seasonal Influenza Vaccine
Intervention · BIOLOGICAL
License Seasonal Influenza Vaccine will be administered as a single intramuscular dose.
- Licensed COVID-19 Vaccine
Intervention · BIOLOGICAL
Licensed COVID-19 Vaccine will be administered as a single intramuscular dose.
Study details
- Official title
- A Phase 1, Observer-Blind, Randomized, Controlled Study to Evaluate the Safety and Immunogenicity of an Investigational mRNA Seasonal Flu/COVID-19 Combination Vaccine in Adults
- Sponsor
- GlaxoSmithKline
- Conditions
- Influenza, Human+COVID-19
- Enrolling
- 1,475 people
- Starts
- 2026-03-09
- Est. completion
- 2027-06-03
- Design
- Triple-blind, randomized, sequential groups, Phase 1
- Record
- View on ClinicalTrials.gov ↗
Who can join
Age 65 Years – 85 YearsSex ALLHealthy volunteers Not acceptedYou may qualify if
- Participants, who, in the opinion of the investigator, can and will comply with the requirements of the protocol independently or with the assistance of the caregiver.
- Informed consent obtained from the participant prior to performance of any study-specific procedure.
- A male or female 65 to 85 years of age (YoA) (inclusive) at the time of screening.
- Healthy participants or medically stable patients as established by medical history and clinical examination.
You can't join if
- Any clinically significant laboratory abnormality.
- History of symptomatic influenza/ SARS-CoV-2 infection confirmed by local health authority-approved testing methods within 180 days (for influenza) or 90 days (SARS-CoV-2 infection) prior to study intervention administration.
- History of Guillain-Barré syndrome (GBS) within 6 weeks of receiving any vaccine.
- Current or past malignancy, unless completely resolved without clinically significant sequelae (e.g., no evidence of disease following successful treatment of basal cell carcinoma cases are allowed) for >5 years.
- Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination (no laboratory testing required).
- History of or current suspicion of myocarditis or pericarditis (including following administration of an mRNA vaccine); or idiopathic cardiomyopathy, or presence of any medical condition that increases the risk of myocarditis or pericarditis, including cocaine abuse, cardiomyopathy, endomyocardial fibrosis, hypereosinophilic syndrome, hypersensitivity myocarditis, eosinophilic granulomatosis with polyangiitis and persistent myocardial infection.
- History of any reaction or hypersensitivity likely to be exacerbated by any component of the study intervention(s).
- Acute or unstable chronic conditions, clinically significant pulmonary, cardiovascular, or renal functional abnormality, as determined by physical examination and/or laboratory screening tests.
- History of hypersensitivity or allergic reaction to any previous influenza or COVID-19 vaccine.
- History of hypersensitivity or allergic reaction to any previous mRNA vaccine.
- Administration of any influenza vaccine within 181 days before the study intervention administration (Day -180 to Day 1) or planned administration within 28 days (Day 29) after the study intervention administration.
- Administration of a SARS-CoV-2 antigen-containing vaccine in the period starting 91 days before the study intervention administration (Day -90 to Day 1) or planned administration within 28 days (Day 29) after the study intervention administration.
- Administration of any mRNA-based vaccine in the period starting 29 days before the study intervention administration (Day -28 to Day 1) or planned administration within 28 days (Day 29) after the study intervention administration.
- Administration of any other vaccine not foreseen by the study protocol in the period starting 29 days (Day -28 to Day 1) before the study intervention administration or planned administration within 28 days (Day 29) after the study intervention administration.
Sign in and we'll check these against your records.Full criteria on ClinicalTrials.gov ↗
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Study locations (12)
12 openGSK Investigational Site
Anniston, Alabama, United States
GSK Investigational Site
Little Rock, Arkansas, United States
GSK Investigational Site
Fair Oaks, California, United States
GSK Investigational Site
San Diego, California, United States
GSK Investigational Site
Miami, Florida, United States
GSK Investigational Site
Miami Lakes, Florida, United States
GSK Investigational Site
West Palm Beach, Florida, United States
GSK Investigational Site
Stockbridge, Georgia, United States
GSK Investigational Site
Austin, Texas, United States
GSK Investigational Site
Charlottesville, Virginia, United States
GSK Investigational Site
Newport News, Virginia, United States
GSK Investigational Site
Seattle, Washington, United States
Study team
Sponsor
GlaxoSmithKline
Study ID 300768
Frequently asked questions
The sponsor hasn't published answers to common questions for this trial.