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A Phase 2a randomized, observer-blind, study to evaluate the immunogenicity and safety of mRNA-based multivalent seasonal influenza vaccine candidates in adults 18 years of age and older

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-522599-97-00
Acronym
300336
Enrollment
168
Registered
2025-10-13
Start date
2025-10-30
Completion date
Unknown
Last updated
2026-01-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Influenza, Human

Brief summary

• Antigen 1 antibody titer at Day 29 • Fold increase in antigen 1 antibody titer from Day 1 to Day 29 • Antigen 1 antibody seroconversion from Day 1 to Day 29 • Antigen 1 antibody seroprotection at Day 1 and Day 29, • Occurrence of solicited administration site or systemic events with onset within 7 days of study intervention • Occurrence of unsolicited AEs within 28 days of study intervention • Occurrence of SAEs within 6 months of study intervention • Occurrence of AESIs within 6 months of study intervention • Occurrence of MAAEs within 6 months of study intervention • Occurrence of any laboratory abnormalities pre-dose (Day 1), post-Dose (Day 3, Day 8, Day 29)

Detailed description

• Antigen 2 antibody titer at Day 29 • Fold increase in antigen 2 antibody titer from Day 1 to Day 29 • Antigen 2 antibody seroconversion from Day 1 to Day 29

Interventions

Sponsors

GlaxoSmithKline Biologicals
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
• Antigen 1 antibody titer at Day 29 • Fold increase in antigen 1 antibody titer from Day 1 to Day 29 • Antigen 1 antibody seroconversion from Day 1 to Day 29 • Antigen 1 antibody seroprotection at Day 1 and Day 29, • Occurrence of solicited administration site or systemic events with onset within 7 days of study intervention • Occurrence of unsolicited AEs within 28 days of study intervention • Occurrence of SAEs within 6 months of study intervention • Occurrence of AESIs within 6 months of study intervention • Occurrence of MAAEs within 6 months of study intervention • Occurrence of any laboratory abnormalities pre-dose (Day 1), post-Dose (Day 3, Day 8, Day 29)

Secondary

MeasureTime frame
• Antigen 2 antibody titer at Day 29 • Fold increase in antigen 2 antibody titer from Day 1 to Day 29 • Antigen 2 antibody seroconversion from Day 1 to Day 29

Countries

Belgium

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026