Flu Vaccine Study for Adults 65 and Older

We are testing a new adjuvanted flu vaccine to see if it works as well as a standard flu vaccine in preventing influenza in older adults. The study will also evaluate safety and immune response to the vaccine.

6-12 months ≤5 visits Confirmation phase (III)No Placebo Standard Medicines InjectionInfectious Diseases

What diseases are being studied?

Health conditions and diseases that the clinical trial is designed to study and treat.

Who can participate in the clinical trial?

These questions help us understand your situation so we can let the trial team know whether you might be a potential match. This is not a medical evaluation and is not part of the official screening, the study doctor will make the final decision..

What medicines are being studied?

Medicines that are officially approved for use in the European Union and considered safe by EMA. These medicines are already on the market and may be tested for new conditions or populations.

Fluad

Fluad is a vaccine that helps protect older adults from seasonal influenza.

Fluad Tetra

Fluad Tetra is a seasonal flu vaccine for adults 65 and older that helps protect against four common flu strains.

Fluarix

Fluarix is a vaccine used to help protect people against seasonal influenza.

What active substances are being studied?

Active substances that are officially approved for use in the European Union and considered safe by EMA. These substances are already on the market and may be tested for new conditions or populations.

A/Cambodia/E0826360/2020 (H3n2) - Like Strain (A/Tasmania/503/2020, Ivr-221)

A/Cambodia/E0826360/2020 (H3N2)-like strain is an influenza A virus used to develop and test seasonal flu vaccines.

A/Darwin/9/2021 (H3n2) - Like Strain (A/Darwin/6/2021, Ivr-227)

A/Darwin/9/2021 (H3N2)-like strain is an influenza virus used in vaccines to help protect people from seasonal flu.

A/Victoria/2570/2019 (H1n1)pdm09-Like Strain (A/Victoria/2570/2019, Ivr-215)

A/Victoria/2570/2019 (H1N1)pdm09-like strain is an influenza strain used in vaccines to stimulate immunity against H1N1 seasonal flu.

What similar medicines might you know?

Don't worry if you don't know the medicines tested in the trial. There is a chance you have heard about the similar medicines. Check the list below to see if you are familiar with any of them.

Afluria Tetra

Where is the clinical trial being conducted?

Locations and medical facilities where this clinical trial is currently recruiting or conducting research. Select the locations where you would like to participate.

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Jan Yperman Ziekenhuis

05601 Urologie

Ieper, Belgium

Universitair Ziekenhuis Gent

05602 Center of Vaccinology

Ledeberg, Belgium

Medif

05603

Montigny-le-Tilleul, Belgium

Sponsor: Seqirus UK Limited

Last updated: Nov 26, 2025

Disclaimer: Parts of this content have been automatically extracted from the EU Clinical Trials registry. While we strive for accuracy, please always contact the trial site or sponsor directly for correct and official information before making any decisions about participation. View on EU Clinical Trials.