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Pandemic flu H5 HA mRNA SD2 vaccine

Phase 1

Pandemic Influenza Immunization | Vaccine | Infectious Disease |Sanofi|Trials Updated: Jan 16, 2026

Pandemic flu H5 HA mRNA SD2 vaccine development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Apr 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment720

FDA Designations

No designations recorded

Pandemic flu H5 HA mRNA SD2 vaccine clinical trials

Pandemic flu H5 HA mRNA SD2 vaccine · 1 trial · 2 indications

Phase 1 1
NCT06907511Study to Evaluate the Safety and the Immunogenicity of a Second Generation Structurally Designed mRNA Vaccine Candidate Against Pandemic Influenza H5 HA Strain in Healthy Adult Participants Aged 18 Years and OlderPandemic Influenza Immunization
ACTIVE NOT_RECRUITING720 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study to Evaluate the Safety and the Immunogenicity of a Second Generation Structurally Designed mRNA Vaccine Candidate Against Pandemic Influenza H5 HA Strain in Healthy Adult Participants Aged 18 Years and Older
Pandemic Influenza ImmunizationUnlock trial analytics

Study Endpoints

Primary Endpoints

Presence of immediate adverse events (AEs)
Within 30 minutes after each/any injection

Number of participants with immediate AEs

Presence of solicited injection site reactions
Through 7 days after each/any injection

Number of participants with solicited injection site reactions

Presence of solicited systemic reactions
Through 7 days after each/any injection

Number of participants with solicited systemic reactions

Presence of unsolicited AEs
Through 21 days after the first injection through 28 days after the second injection

Number of participants with unsolicited AEs

Presence of medically attended adverse events (MAAEs)
Through 180 days after the last injection

Number of participants with MAAEs

Presence of adverse events of special interest (AESIs)
Throughout the study, approximately 13 months

Number of participants with AESIs

Presence of serious adverse events (SAEs)
Throughout the study, approximately 13 months

Number of participants with SAEs

Presence of out-of-range biological test results (including shift from baseline values)
Through a maximum of 8 days after each injection

Number of participants with out-of-range biological test results

Secondary Endpoints

Geometric mean titers (GMTs) of antibodies (Abs) against investigational pandemic flu H5 HA mRNA SD2 vaccine
Day 01, Day 22, Day 43, Day 112 and Day 202
Individual HA titer ratio
Day22/Day01, Day43/Day01, Day112/Day01, and Day202/Day01
Seroconversion HAI Titer
Day 01, Day 22 and Day 43
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Group 1: Pandemic flu H5 HA mRNA SD2 vaccine (Low dose)EXPERIMENTALParticipants will receive two injections of low dose pandemic flu H5 HA mRNA SD2 vaccine Extension Phase: Additional participants will receive two injections 21 days apart of pandemic flu H5 HA mRNA SD2 vaccine at low dose
Group 2: Pandemic flu H5 HA mRNA SD2 vaccine (Medium dose)EXPERIMENTALParticipants will receive two injections of medium dose pandemic flu H5 HA mRNA SD2 vaccine
Group 3: Pandemic flu H5 HA mRNA SD2 vaccine (High dose)EXPERIMENTALParticipants will receive two injections of high dose pandemic flu H5 HA mRNA SD2 vaccine
Group 4: PlaceboPLACEBO_COMPARATORParticipants will receive two injections of placebo Extension Phase: Additional participants will receive two injections 21 days apart of placebo

Interventions

NameTypeDescription
Pandemic flu H5 HA mRNA SD2 vaccineBIOLOGICALPharmaceutical Form: Suspension in a vial Route of Administration: Intramuscular injection
PlaceboOTHERPharmaceutical Form: Liquid solution in a vial Route of Administration: Intramuscular injection
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites13

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: * Is of non-childbearing potential. To be considered of non-childbearing potential, a female...

Countries:United States
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Frequently asked questions about Pandemic flu H5 HA mRNA SD2 vaccine

What is the Pandemic flu H5 HA mRNA SD2 vaccine?

The Pandemic flu H5 HA mRNA SD2 vaccine is an investigational mRNA vaccine developed by Sanofi for pandemic influenza immunization. It is designed to protect against the H5 hemagglutinin strain of influenza. It is currently in Phase 1 clinical development and has not been approved by any regulatory agency.

What is the Pandemic flu H5 HA mRNA SD2 vaccine used for?

The Pandemic flu H5 HA mRNA SD2 vaccine is being developed for pandemic influenza immunization. It aims to prevent illness caused by the H5 HA strain of influenza virus. The vaccine is intended for healthy adults aged 18 years and older.

Who is developing the Pandemic flu H5 HA mRNA SD2 vaccine?

Sanofi is developing the Pandemic flu H5 HA mRNA SD2 vaccine. Sanofi is a global biopharmaceutical company traded on the Nasdaq under the ticker symbol SNY. The vaccine is part of Sanofi's pandemic influenza preparedness efforts.

What phase is the Pandemic flu H5 HA mRNA SD2 vaccine in?

The Pandemic flu H5 HA mRNA SD2 vaccine is in Phase 1 clinical development. A single Phase 1 trial is currently active and recruiting participants. The vaccine is investigational and has not been approved for any indication.

What clinical trials is the Pandemic flu H5 HA mRNA SD2 vaccine in?

The Pandemic flu H5 HA mRNA SD2 vaccine is being evaluated in one clinical trial: NCT06907511. This Phase 1 study is titled "Study to Evaluate the Safety and the Immunogenicity of a Second Generation Structurally Designed mRNA Vaccine Candidate Against Pandemic Influenza H5 HA Strain in Healthy Adult Participants Aged 18 Years and Older." It is active but not recruiting, with an estimated enrollment of 720 participants in the United States.

Is the Pandemic flu H5 HA mRNA SD2 vaccine approved by the FDA?

No, the Pandemic flu H5 HA mRNA SD2 vaccine is not approved by the FDA. It is an investigational vaccine currently in Phase 1 clinical testing. Approval status has not been granted for any indication.