Phase 3
Completed N=165
Study to Assess the Immune Response and the Safety Profile of a High-Dose Quadrivalent Influenza Vaccine (QIV-HD) Compared to a Standard-Dose Quadrivalent Influenza Vaccine (QIV-SD) in Taiwanese Adults 65 Years of Age and Older
Influenza (Healthy Volunteers)
Source: ClinicalTrials.gov NCT04537234 ↗
Enrolled (actual)
165
Serious AEs
0.0%
Results posted
Nov 2021
Primary outcomePrimary: Geometric Mean Titers (GMTs) of Influenza Vaccine Antibodies at Day 0 — 23.6; 24.1; 111; 169 titers
◆ Published Evidence
Emerging
6citations · ~2 / year
Immunogenicity and safety of high-dose quadrivalent influenza vaccine in older adults in Taiwan: A phase III, randomized, multi-center study.
Summary
Primary Objective:
Immunogenicity: To describe the immune response induced by high-dose quadrivalent influenza vaccine (QIV-HD) and AdimFlu-S (QIS) by hemagglutinin inhibition (HAI) measurement method in all participants.
Safety: To describe the safety profile of all participants in each study groups.
Linked Publications
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Immunogenicity and safety of high-dose quadrivalent influenza vaccine in older adults in Taiwan: A phase III, randomized, multi-center study.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Geometric Mean Titers (GMTs) of Influenza Vaccine Antibodies at Day 0 |
23.6; 24.1; 111; 169; 88.0; 98.2 | — |
| PRIMARY Geometric Mean Titers of Influenza Vaccine Antibodies at Day 28 |
283; 109; 643; 427; 812; 324 | — |
| PRIMARY Geometric Mean Titers Ratio (GMTR) of Influenza Vaccine Antibodies |
12.0; 4.50; 5.81; 2.53; 9.23; 3.30 | — |
| PRIMARY Percentage of Participants Achieving Seroconversion Against Influenza Virus Antigens |
86.3; 50.6; 61.3; 28.9; 78.8; 37.3 | — |
| PRIMARY Percentage of Participants With Antibody Titers >=40 (1/Dilution) at Day 0 |
33.8; 36.1; 76.3; 84.3; 81.3; 85.5 | — |
| PRIMARY Percentage of Participants With Antibody Titers >=40 (1/Dilution) at Day 28 |
97.5; 79.5; 100; 96.4; 98.8; 98.8 | — |
| PRIMARY Number of Participants With Immediate Unsolicited Systemic Adverse Events (AEs) |
0; 0 | — |
| PRIMARY Number of Participants With Solicited Injection Site and Systemic Reactions |
37; 30; 8; 7; 8; 2 | — |
| PRIMARY Number of Participants With Unsolicited Adverse Events |
8; 12 | — |
| PRIMARY Number of Participants With Serious Adverse Events (SAEs) Including Adverse Event of Special Interest (AESIs) |
0; 0; 0; 0 | — |
Eligibility Criteria
Inclusion criteria
- 65 years and older on the day of inclusion.
- Able to attend all scheduled visits and complied with all study procedures.
Exclusion criteria
- Participation at the time of study enrollment (or in the 4 weeks preceding the study vaccination) or planned participation during the study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure.
- Receipt of any vaccine in the 4 weeks (28 days) preceding the study vaccination or planned receipt of any vaccine prior to Visit 2.
- Previous vaccination against influenza (in the preceding 6 months) with either the study vaccine or another vaccine.
- Receipt of immune globulins, blood or blood-derived products in the past 3 months.
- Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months).
- Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccine(s) used in the study or to a vaccine containing any of the same substances.
- Thrombocytopenia, bleeding disorder, or receipt of anticoagulants that based on Investigator's judgment contraindicate intramuscular vaccination.
- Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily.
- Alcohol, prescription drug, or substance abuse that, in the opinion of the Investigator, might interfere with the study conduct or completion.
- Chronic illness that, in the opinion of the investigator, was at a stage where it might interfere with trial conduct or completion.
- Moderate or severe acute illness/infection (according to investigator judgment) on the day of vaccination or febrile illness (temperature greater than or equal to [>=] 38.0 degree Celsius). A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided.
- Personal or family history of Guillain-Barré syndrome.
- Neoplastic disease or any hematologic malignancy (except localized skin or prostate cancer that was stable at the time of vaccination in the absence of therapy and participants who had a history of neoplastic disease and had been disease free for >=5 years).
- Identified as an Investigator or employee of the Investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (i.e., parent, spouse) of the Investigator or employee with direct involvement in the proposed study.
The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.
Data sourced from ClinicalTrials.gov (NCT04537234) and the linked publication. Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.