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Standard Trivalent Influenza Vaccine

Phase 4

Influenza | Vaccines | Infectious Disease |Sanofi|Trials Updated: Dec 3, 2025

Standard Trivalent Influenza Vaccine development status

Highest phase Phase 4 (NCT00390884)
Phase scored for SNYPhase 3
Registered trials 15 across 5 sponsors since Aug 2005

Standard Trivalent Influenza Vaccine target and mechanism

ModalityVaccines

Also known as High-Dose trivalent influenza vaccine, Fluzone

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials2
Total Enrollment1,285

FDA Designations

No designations recorded

Standard Trivalent Influenza Vaccine clinical trials

Standard Trivalent Influenza Vaccine · 2 trials · 3 indications

Phase 3 1Phase 2 1
NCT06641180Study to Evaluate Immunogenicity and Safety of a High-Dose Influenza Vaccine in Adults 50 Through 64 Years of AgeInfluenza
COMPLETED1,180 Analytics
PHASE3COMPLETED
Study to Evaluate Immunogenicity and Safety of a High-Dose Influenza Vaccine in Adults 50 Through 64 Years of Age
InfluenzaUnlock trial analytics

Study Endpoints

Primary Endpoints

Geometric mean titers (GMTs) against influenza vaccine antibodies (Ab)
Day 1 and Day 29

GMTs of anti-influenza antibodies were measured using hemagglutination inhibition (HAI) assay for 3 influenza virus strains: A/H1N1, A/H3N2, and B/Victoria lineage.

Percentage of participants with seroconversion for influenza vaccine antibodies
Day 29

Anti-influenza antibodies will be measured using HAI assay for 3 influenza virus strains: A/H1N1, A/H3N2, and B/Victoria lineage. Seroconversion status 28 days after vaccination (ie, preinjection Ab titer \< 10 \[1/dil\] at Day 1 and post-injection Ab titer≥ 40 \[1/dil\] at Day 29 or preinjection Ab titer ≥ 10 \[1/dil\] at Day 1 and a ≥ 4-fold increase in titer \[1/dil\] at Day 29).

The Geometric Mean Titer (GMT) of High-dose Influenza Vaccine vs the Standard Trivalent Influenza Vaccine in Adult Subjects on Chemotherapy Who Are Less Than 65 Years Old.
Baseline and 28 days

Measure Hemagglutination Inhibition (HAI) Geometric Mean Titer (GMT) immunogenicity of high-dose (HD) and standard dose (SD) vaccine before and after vaccination at day 28.

Secondary Endpoints

Geometric Mean of Individual Titer Ratio (GMTR)
Day 1 and Day 29
Percentage of participants with detectable HAI titer (HAI titer ≥ 10 [1/dil])
Day 1 and Day 29
Percentage of participants with HAI titer ≥ 40 (1/dil)
Day 29
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
IIV-HDEXPERIMENTALParticipants will receive a single intramuscular (IM) injection of IIV-HD at Day 1
IIV-SDACTIVE_COMPARATORParticipants will receive a single intramuscular (IM) injection of IIV-SD at Day 1
High-Dose Influenza VaccineEXPERIMENTAL -
Standard Trivalent Influenza VaccineACTIVE_COMPARATOR -

Interventions

NameTypeDescription
High-Dose trivalent influenza vaccine (Split virion, Inactivated)BIOLOGICALLiquid suspension for intramuscular injection
Standard-dose trivalent influenza vaccine (Split virion, Inactivated)BIOLOGICALLiquid suspension for intramuscular injection
Standard Trivalent Influenza VaccineBIOLOGICALEach 0.5 mL dose contains influenza split virus antigens formulated to contain a total of 45 mcg of influenza virus hemagglutinin, 15 mcg each from the 3 influenza virus strains in the vaccine.One dose given per patient.
High-Dose Influenza VaccineBIOLOGICALEach 0.5 mL dose of Fluzone High-Dose contains influenza split virus antigens that are formulated to contain a total of 180 mcg of influenza virus hemagglutinin, 60 mcg each from the 3 influenza virus strains in the vaccine. One dose given per patient.
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Eligibility Criteria

Age Range50 Years to 64 Years
SexALL
Healthy VolunteersYes
Study Sites20

Inclusion Criteria: * Aged 50 to 64 years 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 m...

Countries:United States
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Frequently asked questions about Standard Trivalent Influenza Vaccine

What is High-Dose trivalent influenza vaccine?

High-Dose trivalent influenza vaccine is an inactivated, split virion influenza vaccine developed by Sanofi. It is studied for prevention of influenza, including in adults aged 50 through 64 years and in cancer patients receiving chemotherapy. It is also known as Standard Trivalent Influenza Vaccine and High-Dose trivalent influenza vaccine (Split virion, Inactivated).

What is High-Dose trivalent influenza vaccine used for in cancer patients?

High-Dose trivalent influenza vaccine has been studied in cancer patients younger than 65 years who are receiving chemotherapy, to assess influenza vaccination in that population. A completed Phase 2 trial, NCT01666782, compared the high-dose vaccine with a standard vaccine in 105 participants with cancer and influenza viral infections.

Who makes High-Dose trivalent influenza vaccine?

High-Dose trivalent influenza vaccine is developed by Sanofi, which trades under the ticker SNY. Sanofi is the sponsor associated with the clinical development program for this inactivated, split virion trivalent influenza vaccine.

What phase is High-Dose trivalent influenza vaccine in?

High-Dose trivalent influenza vaccine is in clinical development, with completed Phase 2 and Phase 3 studies. It is investigational. A Phase 3 trial, NCT06641180, evaluated immunogenicity and safety in adults 50 through 64 years of age and has been completed.

What clinical trials is High-Dose trivalent influenza vaccine in?

Two completed trials are registered for High-Dose trivalent influenza vaccine. NCT06641180 was a Phase 3 immunogenicity and safety study in adults 50 through 64 years of age in the United States, enrolling 1,180 participants. NCT01666782 was a Phase 2 comparison with standard vaccine in cancer patients under 65 receiving chemotherapy, enrolling 105.

Is High-Dose trivalent influenza vaccine the same as Standard Trivalent Influenza Vaccine?

High-Dose trivalent influenza vaccine is also known as Standard Trivalent Influenza Vaccine and as High-Dose trivalent influenza vaccine (Split virion, Inactivated). These names refer to the same Sanofi trivalent influenza vaccine asset described in its clinical development program.