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3.75 µg H5N8 antigen plus full dose AS03A

Phase 2

Influenza | Monoclonal antibody | Infectious Disease |Icon Plc|Last Updated: Jan 9, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment1,380
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06560151Assess Safety and Immunogenicity of A/H5 Inactivated Monovalent Influenza Vaccines at Different Antigen Dose Levels Adjuvanted With AS03 or MF59PHASE2 COMPLETED 1,380Aug 21, 2024Jun 11, 2025Jan 9, 202620 United States
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Study Endpoints
Primary Endpoints
The percentage of participants who experience any solicited local reactogenicity symptom occurring within 8 days of each vaccination, inclusive of the vaccination day.
Day 1 through Day 8 and Day 22 through Day 29
The percentage of participants who experience any solicited systemic reactogenicity symptom occurring within 8 days of each vaccination, inclusive of the vaccination day.
Day 1 through Day 8 and Day 22 through Day 29
The percentage of participants achieving seroprotection at Day 43 based on serum HAI antibody titers (≥1:40) to A/Astrakhan (H5N8).
Day 43
Secondary Endpoints
The percentage of participants who experience any unsolicited TEAE within 22 days of each vaccination, inclusive of the vaccination day.
Day 1 through Day 22 and Day 22 through Day 43
The percentage of participants who experience any treatment-emergent SAE.
Day 1 through Day 203
The percentage of participants who experience any treatment-emergent MAAE.
Day 1 through Day 203
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeOTHER
Treatment Arms
ArmTypeDescription
Treatment Group AEXPERIMENTALThis treatment group of 60 participants (ages 18-64) in Treatment Group A will receive 3.75 µg of Egg-A/Astrakhan/3212/2020 (H5N8) antigen adjuvanted with a full dose of AS03A.
Treatment Group BEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants ages ≥65) in Treatment Group B will receive 7.5 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with a full dose of AS03A.
Treatment Group CEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 15 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with a full dose of AS03A.
Treatment Group DEXPERIMENTALThis treatment group of 60 participants (ages 18-64) will receive 3.75 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with a half dose of AS03A.
Treatment Group EEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 7.5 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with a half dose of AS03A.
Treatment Group FEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65 will receive 15 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with a half dose of AS03A.
Treatment Group GEXPERIMENTALThis treatment group of 60 participants (ages 18-64) will receive 3.75 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with MF59.
Treatment Group HEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 7.5 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with MF59.
Treatment Group IEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 15 µg of Egg-A/Astrakhan/3212/2020 (H5N8) adjuvanted with MF59.
Treatment Group JEXPERIMENTALThis treatment group of 60 participants (ages 18-64) will receive 3.75 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with a full dose of AS03A.
Treatment Group KEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 7.5 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with a full dose of AS03A.
Treatment Group LEXPERIMENTALThis treatment group of 60 participants (ages ≥65) will receive 15 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with a full dose of AS03A.
Treatment Group MEXPERIMENTALThis treatment group of 60 participants (ages 18-64) will receive 3.75 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with MF59.
Treatment Group NEXPERIMENTALThis treatment group of 120 participants (60 participants ages 18-64 and 60 participants age ≥65) will receive 7.5 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with MF59.
Treatment Group OEXPERIMENTALThis treatment group of 60 participants (age ≥65) will receive 15 µg of Egg-A/bar-headed goose/Qinghai Lake/1A/2005 (H5N1) adjuvanted with MF59.
Interventions
NameTypeDescription
3.75 µg H5N8 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
7.5 µg H5N8 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
15 µg H5N8 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
3.75 µg H5N8 antigen plus half dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
7.5 µg H5N8 antigen plus half dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
15 µg H5N8 antigen plus half dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N8 vaccine.
3.75 µg H5N8 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N8 vaccine.
7.5 µg H5N8 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N8 vaccine.
15 µg H5N8 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N8 vaccine.
3.75 µg H5N1 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N1 vaccine.
7.5 µg H5N1 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N1 vaccine.
15 µg H5N1 antigen plus full dose AS03ABIOLOGICALTwo intramuscular doses (21 days apart) of AS03A adjuvanted H5N1 vaccine.
3.75 µg H5N1 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N1 vaccine.
7.5 µg H5N1 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N1 vaccine.
15 µg H5N1 antigen plus MF59BIOLOGICALTwo intramuscular doses (21 days apart) of MF59 adjuvanted H5N1 vaccine.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersYes
Study Sites20

Inclusion Criteria: 1. Male or non-pregnant female, 18 years of age or older at the time of screening and informed consent. 2. Willing and able to provide written informed consent prior to initiation of study procedures. 3. Agrees to have specimens collected during this trial specifically for the p...

Countries:United States
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