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Fluzone High-Dose influenza vaccine

Phase 1

Healthy Participants | Monoclonal antibody | Other |Cidara Therapeutics, Inc.|Last Updated: Aug 19, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Fluzone® High-Dose (HD) influenza vaccine

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment710

FDA Designations

No designations recorded

Clinical trial landscape

Fluzone High-Dose influenza vaccine · 1 trial · 1 indication

Phase 1 1
NCT07300085A Trial to Evaluate the Effect of CD388/MK1406 on the Immunogenicity of Fluzone® HD Vaccine (CD388.SQ.1.08/MK-1406-007)Healthy Participants
ACTIVE NOT_RECRUITING710 Analytics
PHASE1ACTIVE NOT_RECRUITING
A Trial to Evaluate the Effect of CD388/MK1406 on the Immunogenicity of Fluzone® HD Vaccine (CD388.SQ.1.08/MK-1406-007)
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Study Endpoints

Primary Endpoints

Geometric Mean of Hemagglutinin Inhibition (HAI) Titers Against the Influenza Strains Contained in the Vaccine Among Participants Receiving Concomitant Fluzone® High-Dose (HD) and MK-1406 Compared to Participants Who Receive Fluzone® HD and Placebo
Predose (Day 1), Day 15 and Day 29

Geometric mean of HAI titers at 2-weeks and 4-weeks post-trial intervention against the influenza virus strains contained in the vaccine among participants receiving concomitant Fluzone® HD influenza vaccine and MK-1406 compared to participants who receive Fluzone® HD and placebo will be determined. HAI testing will be performed using validated methods in accordance with applicable Good Clinical Laboratory Practice (GCLP) and laboratory Standard Operating Procedures (SOPs). Geometric Mean Titers (GMTs) will be summarized by treatment group and influenza strain.

Percentage of Participants with Seroconversion Rates against the Influenza Strains Contained in the Vaccine Among Participants Receiving Concomitant Fluzone® HD and MK-1406 Compared to Participants Who Receive Fluzone® HD and Placebo
Predose (Day 1), Day 15 and Day 29

Seroconversion is defined as a 4-fold increase in influenza titer as measured by HAI assay at each visit compared to baseline. Seroconversion rates at 2-weeks and 4-weeks post-trial intervention against the influenza virus strains contained in the vaccine among participants receiving concomitant Fluzone® HD influenza vaccine and MK-1406 compared to participants who receive Fluzone® HD and placebo will be determined. Seroconversion rates will be summarized by treatment group and influenza strain.

Secondary Endpoints

Percentage of participants with ≥1 Adverse Event (AE)
Up to approximately Day 29
Percentage of Participants Who Discontinued from the Study Due to an Adverse Event
Up to approximately Day 29
Percentage of Participants with a Solicited Injection-site Adverse Event
Up to approximately Day 8 post-dose
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Fluzone® High-Dose (HD) plus MK-1406EXPERIMENTALParticipants will receive open-label Fluzone® HD influenza vaccine by intramuscular (IM) injection plus MK-1406 by subcutaneous (SC) injection on Day 1.
Fluzone® HD plus PlaceboPLACEBO_COMPARATORParticipants will receive open-label Fluzone® HD influenza vaccine by IM injection plus placebo by SC injection on Day 1.

Interventions

NameTypeDescription
Fluzone® High-Dose (HD) influenza vaccineBIOLOGICALFluzone® HD injectable suspension administered by intramuscular (IM) injection
MK-1406 InjectionCOMBINATION_PRODUCTMK-1406 liquid for injection administered subcutaneously
PlaceboCOMBINATION_PRODUCTMK-1406 matched liquid for SC injection
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Eligibility Criteria

Age Range18 Years to 49 Years
SexALL
Healthy VolunteersYes
Study Sites4

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: * Be ≥18 to ≤49 years of age * Be deemed healthy by the Investigator * Have not received any seasonal influenza vaccine and have not had a diagnosed or suspected influenza infection within 12 months prior...

Countries:United States
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Recent Changes (Last 90 Days)

MEDIUMAug 19, 2026NCT07300085Enrollment: 100 → 710
MEDIUMAug 19, 2026NCT07300085Enrollment: 100 → 710

Frequently asked questions about Fluzone High-Dose influenza vaccine

What is Fluzone High-Dose influenza vaccine used for?

Fluzone High-Dose influenza vaccine is an investigational vaccine being studied in healthy participants. It is being evaluated in a Phase 1 clinical trial to assess its immunogenicity when given with CD388/MK1406. The vaccine is intended for use in healthy adults aged 18 years and older.

Who makes Fluzone High-Dose influenza vaccine?

Fluzone High-Dose influenza vaccine is being developed by Cidara Therapeutics, Inc., which trades under the ticker CDTX. The company is conducting a Phase 1 clinical trial to evaluate the vaccine's effect on immunogenicity when combined with CD388/MK1406 in healthy participants.

What phase is Fluzone High-Dose influenza vaccine in?

Fluzone High-Dose influenza vaccine is in Phase 1 clinical development. It is currently being studied in an active, not recruiting trial with 710 participants. The vaccine is investigational and has not been approved by regulatory authorities.

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

Fluzone High-Dose influenza vaccine is being studied in one Phase 1 clinical trial with the identifier NCT07300085. The trial is titled 'A Trial to Evaluate the Effect of CD388/MK1406 on the Immunogenicity of Fluzone® HD Vaccine' and is being conducted in the United States with 710 healthy participants.

Is Fluzone High-Dose influenza vaccine the same as Fluzone® High-Dose (HD) influenza vaccine?

Yes, Fluzone High-Dose influenza vaccine is also known as Fluzone® High-Dose (HD) influenza vaccine. Both names refer to the same investigational vaccine being developed by Cidara Therapeutics, Inc. for use in healthy participants.