Massive study tests whether a stronger flu shot saves more seniors from hospitalization
NCT ID NCT06506812
First seen Jun 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time
Summary
This study combines data from two large trials in Denmark and Spain involving over 466,000 older adults. It compares the high-dose flu vaccine (Efluelda/Fluzone High-Dose) to the standard-dose flu shot to see which better prevents severe outcomes like hospitalization for flu or pneumonia. The goal is to get clearer answers by pooling data from different countries and seasons.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- High-dose quadrivalent influenza vaccine (Efluelda/Fluzone High-Dose Quadrivalent) vs. standard-dose quadrivalent influenza vaccine
- What this could lead to
- If high-dose vaccine proves more effective, it could become the preferred flu shot for older adults, reducing hospitalizations and deaths from flu.
- What could go wrong
- This is a pooled analysis of completed trials, not a new experiment. The results may not apply to all populations or flu seasons, and high-dose vaccine may cause more local reactions.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Get updates
Get notified about this study
Sign up to get updates when this study changes or when new studies for INFLUENZA are added.
By submitting, you agree to our Terms of use
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte
Hellerup, Capital Region, 2900, Denmark
More trials for these conditions
Other studies related to the condition(s) this trial covers.
- Flu vaccine showdown: which shot protects seniors best?
- Can a simple breath test catch flu in High-HIV regions?
- Can a simple mask stop the flu? 2,000 volunteers put it to the test
- Can a stronger flu shot better protect seniors?
- Flu shot showdown: Cell-Grown vs recombinant vaccine put to the test
- New mRNA vaccine aims to outsmart flu by targeting its hidden parts