Recent Updates
Recently added Catalysts

Flu mRNA

Phase 2

Influenza, Human | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: May 28, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Flu mRNA (Formulation B1)

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials2
Total Enrollment1,747

FDA Designations

No designations recorded

Clinical trial landscape

Flu mRNA · 2 trials · 1 indication

Phase 2 2
NCT07204964A Study to Evaluate the Immune Response and Safety of an Influenza Vaccine in Adults 18 Years of Age and AboveInfluenza, Human
ACTIVE NOT_RECRUITING971 Analytics
NCT07121192A Study to Assess the Immune Response and Safety of a Vaccine Against Influenza in Adults 18 Years of Age and OlderInfluenza, Human
COMPLETED776 Analytics
PHASE2ACTIVE NOT_RECRUITING
A Study to Evaluate the Immune Response and Safety of an Influenza Vaccine in Adults 18 Years of Age and Above
Influenza, HumanUnlock trial analytics
PHASE2COMPLETED
A Study to Assess the Immune Response and Safety of a Vaccine Against Influenza in Adults 18 Years of Age and Older
Influenza, HumanUnlock trial analytics

Study Endpoints

Primary Endpoints

Geometric Mean Titer (GMT) Of Antigen 1 Titer
At Day 29
Geometric Mean Increase (GMI) of Antigen 1 Titer
From Day 1 to Day 29
Percentage of Participants with Antigen 1 Seroconversion Rate (SCR)
From Day 1 to Day 29
Percentage of Participants with Antigen 1 Seroprotection Rate (SPR)
At Day 1 and Day 29
Number of Participants with Solicited Administration Site Adverse Events (AEs)
From Day 1 to Day 7

The solicited administration site AEs considered are pain, redness, swelling and lymphadenopathy.

Number of Participants with Solicited Systemic AEs
From Day 1 to Day 7

The solicited systemic AEs considered are fever, headache, fatigue, myalgia, arthralgia and chills. Fever is defined as temperature greater than or equal to (\>=) 38 °C/100.4 °F regardless the location of measurement.

Number of Participants with Unsolicited AEs
From Day 1 to Day 28

An unsolicited AE is an AE that was either not included in the list of solicited events or could be included in the list of solicited events but with an onset outside the specified period of follow-up for solicited events.

Number of Participants with Serious Adverse Events (SAEs)
From Day 1 to Day 181 (study end)

SAE is an AE which results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in disability/incapacity, or other situations that are considered serious per medical or scientific judgment.

Number of Participants with Adverse Events of Special Interest (AESIs)
From Day 1 to Day 181 (study end)
Number of Participants with Medically Attended Adverse Events (MAAEs)
From Day 1 to Day 181 (study end)

A MAAE is an AE for which the participant received medical attention including any symptom or illness requiring hospitalization, or an emergency room visit, or visit to/by a healthcare professional.

Number of Participants with any Laboratory abnormalities
From Day 1 to Day 29
Geometric Mean Titer (GMT) Ratio of Antigen 1 Titer
At Day 29

Secondary Endpoints

GMT Ratio of Antigen 2 Titer
At Day 29
GMI of Antigen 2 Titer
From Day 1 to Day 29
Percentage of Participants with Antigen 2 SCR
From Day 1 to Day 29
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Flu mRNA_1_YAEXPERIMENTALEligible Younger Adults (YA) participants receive a single dose of Flu mRNA Formulation B1 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_3_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B3 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_4_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation A (GSK6479720A) as study intervention at Day 1.
Comparator_1_YAACTIVE_COMPARATOREligible YA participants receive a single dose of comparator 1 at Day 1.
Comparator_2_YAACTIVE_COMPARATOREligible YA participants receive a single dose of comparator 2 at Day 1.
Flu mRNA_1_OAEXPERIMENTALEligible Older Adults (OA) participants receive a single dose of Flu mRNA Formulation B1 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_3_OAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B3 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_4_OAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation A (GSK6479720A) as study intervention at Day 1.
Comparator_1_OAEXPERIMENTALEligible OA participants receive a single dose of comparator 1 at Day 1.
Comparator_2_OAACTIVE_COMPARATOREligible OA participants receive a single dose of comparator 3 at Day 1.
Flu mRNA_2_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B (GSK6479715A) as study intervention at Day 1.
Flu mRNA_2_OAEXPERIMENTALEligible OA participants receive a single dose of Flu mRNA Formulation B (GSK6479715A) as study intervention at Day 1.
Comparator_3_OAACTIVE_COMPARATOREligible OA participants receive a single dose of comparator 3 at Day 1.

Interventions

NameTypeDescription
Flu mRNA (Formulation B1)BIOLOGICALOne dose of Flu mRNA (Formulation B1) received intramuscularly.
Flu mRNA (Formulation B3)BIOLOGICALOne dose of Flu mRNA (Formulation B3) received intramuscularly.
Flu mRNA(Formulation A)BIOLOGICALOne dose of Flu mRNA (Formulation A) received intramuscularly.
Comparator 1COMBINATION_PRODUCTOne dose of Comparator 1 received intramuscularly.
Comparator 2COMBINATION_PRODUCTOne dose of Comparator 2 received intramuscularly.
Comparator 3COMBINATION_PRODUCTOne dose of Comparator 3 received intramuscularly.
Flu mRNA (Formulation A)BIOLOGICALOne dose of Flu mRNA (Formulation A) received intramuscularly.
Flu mRNA (Formulation B)BIOLOGICALOne dose of Flu mRNA (Formulation B) received intramuscularly.
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites17

Inclusion Criteria: 1. Participants, who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g., completion of the eDiary, attendance to study contacts and study site visits, and ability to access and utilize a phone or other electronic communications) ...

Countries:United StatesBelgium
Unlock Eligibility Criteria

Recent Changes (Last 90 Days)

MEDIUMJun 28, 2026NCT07121192TRIAL_REMOVED: changed
MEDIUMJun 28, 2026NCT07121192TRIAL_REMOVED: changed
MEDIUMJun 28, 2026NCT07121192TRIAL_REMOVED: changed
MEDIUMJun 28, 2026NCT07121192TRIAL_REMOVED: changed

Frequently asked questions about Flu mRNA

What is Flu mRNA used for?

Flu mRNA is an investigational vaccine being developed for the prevention of influenza in adults 18 years of age and older. It is designed to generate an immune response against the influenza virus. The vaccine is currently in Phase 2 clinical development and is not yet approved for use.

Who makes Flu mRNA?

Flu mRNA is being developed by GSK plc, a global biopharma company listed on the London Stock Exchange under the ticker GSK. The company is conducting clinical trials to evaluate the vaccine's immune response and safety in adult populations.

What phase is Flu mRNA in?

Flu mRNA is currently in Phase 2 clinical development. It is an investigational vaccine and has not been approved by regulatory authorities. Two Phase 2 trials have been conducted or are ongoing to assess its safety and immunogenicity in adults.

What clinical trials is Flu mRNA in?

Flu mRNA has been evaluated in two Phase 2 trials. NCT07121192, a completed study with 776 participants in the United States, assessed immune response and safety in adults. NCT07204964, an active but not recruiting study with 971 participants in the United States and Belgium, is evaluating immune response and safety in adults 18 and older.

Is Flu mRNA the same as Flu mRNA (Formulation B1)?

Yes, Flu mRNA is also known as Flu mRNA (Formulation B1). This alternative name refers to a specific formulation of the vaccine being tested in clinical trials. Researchers and regulatory documents may use either name to describe the same investigational product.