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Study identifier: NCT06361875 Synced from ClinicalTrials.gov · July 29, 2026
● Completed

A Study to Investigate the Safety and Immunogenicity of the Quadrivalent Influenza mRNA Vaccines in Adults Aged 18 Years and Above

Condition: Influenza Immunization  ·  Sponsor: Sanofi Pasteur, a Sanofi Company

PhasePhase 1/Phase 2
Planned participants910
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersYes

About this study

The purpose of this study is to evaluate the safety and immunogenicity of a single intramuscular (IM) injection of different formulations of Quadrivalent Influenza Vaccine (QIV) messenger ribonucleic acid (mRNA) (MRT5421, MRT5424, and MRT5429) compared to an active control (QIV- standard dose (SD), QIV- high dose (HD) \[adults ≥ 65 years of age only\], or quadrivalent recombinant influenza vaccine (RIV4)) in adults 18 years of age and older.

This description comes directly from the study's public registry record.

Talk to the study team

Contact details are listed per location below or on the registry record.

Always discuss trial participation with your own doctor first.

Locations (20)

Long Beach Clinical Trials Site Number : 8400013Long Beach, California, United States
California Research Foundation Site Number : 8400038San Diego, California, United States
Accel Clinical Research-Deland Clinical Research Unit- Site Number : 8400001DeLand, Florida, United States
SIMEDHealth, LLC- Site Number : 8400011Gainesville, Florida, United States
Indago Research and Health Center- Site Number : 8400032Hialeah, Florida, United States
Cenexel Research Centers of America- Site Number : 8400037Hollywood, Florida, United States
Suncoast Research Group, LLC- Site Number : 8400015Miami, Florida, United States
Brengle Family Medicine Site Number : 8400045Indianapolis, Indiana, United States
AMR Lexington- Site Number : 8400042Lexington, Kentucky, United States
Velocity Clinical Research- New Orleans Site Number : 8400053New Orleans, Louisiana, United States
The Alliance for Multispecialty Research - KCM, LLC- Site Number : 8400034Kansas City, Missouri, United States
Velocity Clinical Research Norfolk- Site Number : 8400046Norfolk, Nebraska, United States

+ 8 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT06361875