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Pandemic flu H5 HA mRNA SD2 vaccine

Phase 1

Pandemic Influenza Immunization | Monoclonal antibody | Infectious Disease |Sanofi|Last Updated: Jan 16, 2026

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

Clinical trial landscape

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 Pandemic flu H5 HA mRNA SD2 vaccine used for?

Pandemic flu H5 HA mRNA SD2 vaccine is an investigational vaccine being developed for pandemic influenza immunization. It is designed to protect against pandemic influenza caused by the H5 HA strain. The vaccine is currently being studied in healthy adult participants aged 18 years and older to evaluate its safety and immunogenicity.

Who makes Pandemic flu H5 HA mRNA SD2 vaccine?

Pandemic flu H5 HA mRNA SD2 vaccine is being developed by Sanofi, a biopharmaceutical company traded on the stock exchange under the ticker symbol SNY. Sanofi is conducting clinical trials to evaluate the vaccine's safety and immunogenicity in healthy adults.

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

Pandemic flu H5 HA mRNA SD2 vaccine is in Phase 1 clinical development. It is an investigational vaccine, meaning it has not been approved by regulatory authorities and is still being studied in clinical trials. The Phase 1 trial is currently active but not recruiting participants.

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

Pandemic flu H5 HA mRNA SD2 vaccine is being evaluated in one Phase 1 clinical trial with the identifier NCT06907511. This randomized, double-blind, placebo-controlled study is assessing the safety and immunogenicity of the vaccine in healthy adults aged 18 years and older in the United States, with a planned enrollment of 720 participants.

How does Pandemic flu H5 HA mRNA SD2 vaccine work?

Pandemic flu H5 HA mRNA SD2 vaccine is an mRNA-based vaccine that encodes the hemagglutinin (HA) protein from the H5 strain of pandemic influenza. The vaccine is designed to induce an immune response against the H5 HA antigen, potentially providing protection against pandemic influenza infection.