Influenza Vaccine Study for Adults Aged 65-79

We are comparing a high-dose flu vaccine to a standard-dose vaccine to see which one better reduces hospital visits for flu and pneumonia in older adults. This study aims to improve vaccine effectiveness for this age group.

Monitoring phase (IV)No PlaceboStandard MedicinesInjectionInfectious 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.

Efluelda
Efluelda is a vaccine that helps protect people from seasonal influenza (the flu).
Influvac Tetra
Influvac Tetra is a vaccine that helps protect people each year against several common strains of seasonal flu.

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/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.
A/Victoria/4897/2022 (H1n1)pdm09-Like Strain (A/Victoria/4897/2022, Ivr-238)
A/Victoria/4897/2022 (H1N1)pdm09-like strain is an influenza A virus used in vaccines to help protect 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
Alpharix
Alpharix-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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Dirección General de Salud Pública
Xefa do Servizo de Control de Enfermedades Transmisibles
Santiago de Compostela, Spain
Sponsor: Complexo Hospitalario Universitario De Santiago
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.