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mRNA NA vaccine

Phase 1

Influenza Immunization | Vaccine | Infectious Disease |Sanofi|Trials Updated: Sep 15, 2025

mRNA NA vaccine development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jun 2022

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment233

FDA Designations

No designations recorded

mRNA NA vaccine clinical trials

mRNA NA vaccine · 1 trial · 2 indications

Phase 1 1
NCT05426174Study to Assess the Safety and Immunogenicity of Monovalent mRNA NA Vaccine in Adult Participants 18 Years of Age and OlderInfluenza Immunization
COMPLETED233 Analytics
PHASE1COMPLETED
Study to Assess the Safety and Immunogenicity of Monovalent mRNA NA Vaccine in Adult Participants 18 Years of Age and Older
Influenza ImmunizationUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with immediate adverse events
Within 30 minutes after vaccination

Immediate adverse events are unsolicited systemic adverse events reported in the 30 minutes after vaccination

Number of participants with solicited injection site or systemic reaction
From Day 1 to Day 8
Number of participants with unsolicited adverse events
From Day 1 to Day 29

Unsolicited (spontaneously reported) adverse events not fulfilling criteria for solicited reactions

Number of participants with serious adverse events
From Day 1 to Day 366

Serious adverse events are collected throughout the study

Number of participants with adverse events of special interest
From Day 1 to Day 366

Adverse events of special interest are collected throughout the study

Number of patients with clinically significant changes in clinical laboratory tests
From Day 1 to Day 8

Laboratory tests include hematology: complete blood count (CBC) with differential, platelet count, coagulation panel (prothrombin time and PTT) and serum chemistry: alanine aminotransferase (ALT), aspartate aminotransferase (AST), total and fractionated bilirubin, C-reactive protein, serum creatinine, and blood urea nitrogen

Secondary Endpoints

Neuraminidase inhibition (NAI) Antibodies at Day 1 and 29
Day 1 and 29
Individual Neuraminidase inhibition (NAI) titer
Day 1 and Day 29
2-fold and 4-fold rise in NAI antibody titers
From Day 1 to Day 29
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Group 1 mRNA NA: Low dose LevelEXPERIMENTALParticipants will receive a low dose of mRNA vaccine
Group 2 mRNA NA: Medium dose levelEXPERIMENTALParticipants will receive a medium dose of mRNA vaccine
Group 3 mRNA NA: High dose levelEXPERIMENTALParticipants will receive a high dose of mRNA vaccine
Group 4: QIV-HDACTIVE_COMPARATORParticipants will receive QIV-HD (high dose quadrivalent influenza) vaccine

Interventions

NameTypeDescription
mRNA NA vaccineBIOLOGICALPharmaceutical form: Suspension for injection Route of administration: Intramuscular
High Dose Quadrivalent Influenza VaccineBIOLOGICALPharmaceutical form: Suspension for injection Route of administration: Intramuscular
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites6

Inclusion Criteria: * Aged 18 years or older on the day of inclusion. * A female participant is eligible to participate if she is not pregnant or breastfeeding and one of the following conditions applies: 1. Is of non-childbearing potential. To be considered of non-childbearing potential, a fema...

Countries:United States
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Frequently asked questions about mRNA NA vaccine

What is the mRNA NA vaccine?

The mRNA NA vaccine is an investigational vaccine developed by Sanofi for influenza immunization. It uses messenger RNA to present the neuraminidase antigen, aiming to protect against influenza. It is in Phase 1 clinical development and has been studied in a completed trial of 233 adults aged 18 and older.

What is the mRNA NA vaccine used for?

The mRNA NA vaccine is being developed for influenza immunization. It is intended to prevent influenza infection in healthy adults. The vaccine is investigational and has been evaluated in a Phase 1 trial that enrolled 233 participants aged 18 years and older in the United States.

Who makes the mRNA NA vaccine?

Sanofi develops the mRNA NA vaccine. Sanofi is a global pharmaceutical company traded on the New York Stock Exchange under the ticker SNY. The company is responsible for the research and clinical development of this investigational influenza vaccine candidate.

What phase is the mRNA NA vaccine in?

The mRNA NA vaccine is in Phase 1 clinical development. One Phase 1 trial has been completed. The vaccine is investigational and has not been approved by the FDA for any indication. The completed trial enrolled 233 adults and assessed safety and immunogenicity.

What clinical trials is the mRNA NA vaccine in?

The mRNA NA vaccine has been studied in one completed Phase 1 trial, NCT05426174, titled "Study to Assess the Safety and Immunogenicity of Monovalent mRNA NA Vaccine in Adult Participants 18 Years of Age and Older." It was a randomized, double-blind, active-controlled trial that enrolled 233 participants in the United States.