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Quadrivalent influenza modRNA vaccine

Phase 3

Influenza, Human | Monoclonal antibody | Infectious Disease |Pfizer, Inc.|Last Updated: May 8, 2025

Success Probability

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment45,789

FDA Designations

No designations recorded

Clinical trial landscape

Quadrivalent influenza modRNA vaccine · 1 trial · 1 indication

Phase 3 1
NCT05540522A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or OlderInfluenza, Human
COMPLETED45,789 Analytics
PHASE3COMPLETED
A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older
Influenza, HumanUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants Reporting First Episode of LCI Cases With Associated Per-Protocol ILI Caused by Any Strain at Least 14 Days After Vaccination: 18-64 Years
Day 15 to surveillance cut-off (approximately 6 months)

LCI was defined as influenza infection confirmed through through reverse transcription- polymerase chain reaction (RT-PCR) or culture at the central laboratory, unless otherwise specified. Per-protocol ILI was defined as occurrence (new onset or worsening of preexisting condition) of at least 1 respiratory symptoms concurrently with at least 1 systemic symptoms. Data was obtained during the 2022-2023 northern hemisphere influenza season up to surveillance cut-off decided by Sponsor.

Percentage of Participants Reporting First Episode of Laboratory-Confirmed Influenza (LCI) Cases With Associated Per-Protocol Influenza-Like Illness (ILI) Caused by Any Strain at Least 14 Days After Vaccination: >= 65 Years
Day 15 up to primary surveillance cut-off (approximately 1 year)

LCI was defined as influenza infection confirmed through RT-PCR or culture at the central laboratory, unless otherwise specified. Per-protocol ILI was defined as occurrence (new onset or worsening of preexisting condition) of at least 1 respiratory symptoms concurrently with at least 1 systemic symptoms. Data was obtained during the 2022-2023 northern and southern hemisphere influenza season up to surveillance cut-off decided by Sponsor.

Percentage of Participants Reporting Any Local Reactions Within 7 Days After Study Vaccination: 18-64 Years
From Day 1 to Day 7 after study vaccination

Local reactions included redness, swelling and pain at the injection site and were recorded by participants in an e-diary. All local reactions were graded based on Center for Biologics Evaluation and Research (CBER) toxicity guidelines as Grade 1 (Mild), Grade 2 (Moderate), Grade 3 (Severe) and Grade 4 (potentially life-threatening). In this outcome measure data is reported for any local reaction and any grade.

Percentage of Participants Reporting Any Local Reactions Within 7 Days After Study Vaccination: >=65 Years
From Day 1 to Day 7 after study vaccination

Local reactions included redness, swelling and pain at the injection site and were recorded by participants in an e-diary. All local reactions were graded based on Center for Biologics Evaluation and Research (CBER) toxicity guidelines as Grade 1 (Mild), Grade 2 (Moderate), Grade 3 (Severe) and Grade 4 (potentially life-threatening). In this outcome measure data is reported for any local reaction and any grade.

Percentage of Participants Reporting Any Systemic Events Within 7 Days After Study Vaccination: 18-64 Years
From Day 1 to Day 7 after study vaccination

Systemic events (vomiting, diarrhoea, headache, Fatigue/tiredness, chills, new or worsened muscle pain and joint pain) were recorded by participants in an e-diary. All systemic events were graded based on CBER toxicity guidelines as Grade 1 (Mild), Grade 2 (Moderate), Grade 3 (Severe) and Grade 4 (potentially life-threatening). In this outcome measure data is reported for any systemic reaction and any grade.

Percentage of Participants Reporting Any Systemic Events Within 7 Days After Study Vaccination: >=65 Years
From Day 1 to Day 7 after study vaccination

Systemic events (vomiting, diarrhoea, headache, Fatigue/tiredness, chills, new or worsened muscle pain and joint pain) were recorded by participants in an e-diary. All systemic events were graded based on CBER toxicity guidelines as Grade 1 (Mild), Grade 2 (Moderate), Grade 3 (Severe) and Grade 4 (potentially life-threatening). In this outcome measure data is reported for any systemic reaction and any grade.

Percentage of Participants Reporting Adverse Events (AEs) From Study Vaccination Through 4 Weeks After Study Vaccination: 18-64 Years
From study vaccination on Day 1 through 4 weeks after study vaccination

An AE was defined as any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data.

Percentage of Participants Reporting AEs From Study Vaccination Through 4 Weeks After Study Vaccination: >=65 Years
From study vaccination on Day 1 through 4 weeks after study vaccination

An AE was defined as any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data.

Percentage of Participants Reporting AEs From Study Vaccination Through 4 Weeks After Study Vaccination: >=18 Years
From study vaccination on Day 1 through 4 weeks after study vaccination

An AE was defined as any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data.

Percentage of Participants Reporting Serious Adverse Events (SAEs) From Study Vaccination Through 6 Months After Study Vaccination: 18-64 Years
From Day 1 up to 6 months after vaccination

An SAE was defined as any untoward medical occurrence that, at any dose, met one or more of the following criteria - 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.

Percentage of Participants Reporting SAEs From Study Vaccination Through 6 Months After Study Vaccination: >=65 Years
From Day 1 up to 6 months after vaccination

An SAE was defined as any untoward medical occurrence that, at any dose, met one or more of the following criteria - 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.

Percentage of Participants Reporting SAEs From Study Vaccination Through 6 Months After Study Vaccination: >=18 Years
From Day 1 up to 6 months after vaccination

An SAE was defined as any untoward medical occurrence that, at any dose, met one or more of the following criteria - 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.

Secondary Endpoints

Percentage of Participants Reporting First Episode of LCI Cases With Associated Per-Protocol ILI Caused by All Matched Strains at Least 14 Days After Vaccination: 18-64 Years
Day 15 to surveillance cut-off (approximately 6 months)
Percentage of Participants Reporting First Episode of LCI Cases With Associated Per-Protocol ILI Caused by All Matched Strains at Least 14 Days After Vaccination: >=65 Years
Day 15 up to primary surveillance cut-off (approximately 1 year)
Percentage of Participants Reporting First Episode of Culture Confirmed Influenza (CCI) With Associated Per-Protocol ILI Caused by Any Strain at Least 14 Days After Vaccination: 18-64 Years
Day 15 to surveillance cut-off (approximately 6 months)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Quadrivalent influenza modRNA vaccine, 18 through 64 years of ageEXPERIMENTALQuadrivalent influenza modRNA vaccine (single dose), participants 18 through 64 years of age
Quadrivalent influenza vaccine, 18 through 64 years of ageACTIVE_COMPARATORLicensed quadrivalent influenza vaccine (single dose), participants 18 through 64 years of age
Quadrivalent influenza modRNA vaccine, ≥65 years of ageEXPERIMENTALQuadrivalent influenza modRNA vaccine (single dose), participants ≥65 years of age
Quadrivalent influenza vaccine, ≥65 years of ageACTIVE_COMPARATORLicensed quadrivalent influenza vaccine (single dose), participants ≥65 years of age

Interventions

NameTypeDescription
Quadrivalent influenza modRNA vaccineBIOLOGICALQuadrivalent influenza modRNA vaccine (single dose)
Quadrivalent influenza vaccineBIOLOGICALLicensed quadrivalent influenza vaccine (single dose)
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites321

Inclusion Criteria: 1. Male or female participants ≥18 years of age at Visit 1 (Day 1). 2. Participants who are willing and able to comply with all scheduled visits, investigational plan, laboratory tests, lifestyle considerations, and other study procedures. 3. Healthy participants who are determi...

Countries:United StatesArgentinaChileNew ZealandPhilippinesSouth Africa
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Frequently asked questions about Quadrivalent influenza modRNA vaccine

What is Quadrivalent influenza modRNA vaccine used for?

Quadrivalent influenza modRNA vaccine is an investigational vaccine being developed for the prevention of influenza in humans. It is designed to provide protection against four influenza virus strains. The vaccine is currently in Phase 3 clinical development and is not yet approved by regulatory authorities.

Who makes Quadrivalent influenza modRNA vaccine?

Quadrivalent influenza modRNA vaccine is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. The vaccine is currently in Phase 3 clinical development for the prevention of influenza in adults.

What phase is Quadrivalent influenza modRNA vaccine in?

Quadrivalent influenza modRNA vaccine is in Phase 3 clinical development. It is an investigational vaccine and has not been approved by regulatory authorities. A Phase 3 clinical trial has been completed, and the vaccine remains under investigation for the prevention of influenza in adults.

What clinical trials is Quadrivalent influenza modRNA vaccine in?

Quadrivalent influenza modRNA vaccine has been studied in a Phase 3 clinical trial identified as NCT05540522, titled 'A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older.' This randomized, double-blind, active-controlled trial enrolled 45,789 participants and has been completed.

Is Quadrivalent influenza modRNA vaccine the same as a modified RNA vaccine?

Yes, Quadrivalent influenza modRNA vaccine is a modified RNA (modRNA) vaccine. The clinical trial for this vaccine is titled 'A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older,' confirming that the vaccine uses modified RNA technology to target influenza.