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Boosted flu shot may offer better protection for seniors

NCT ID NCT06676644

Vaccine Sponsor: National Taiwan University Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study compares an adjuvanted (boosted) flu vaccine to a standard flu vaccine in 200 adults aged 65 and older who have chronic medical conditions like diabetes or heart disease. Researchers will measure immune response and safety over one year. The goal is to see if the adjuvanted vaccine provides stronger protection against influenza in this vulnerable group.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
adjuvanted influenza vaccine (aIIV4) and non-adjuvanted influenza vaccine (IIV4)
What this could lead to
If the adjuvanted vaccine works better, it could lead to stronger flu protection for older adults with chronic health issues.
What could go wrong
This is a small, early-phase study (200 participants) in one country, so results may not apply to all elderly populations. The vaccines may show similar effectiveness, or the adjuvanted version could cause more side effects.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 200 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2024

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

65 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults aged 65 years or above * Presence of at least 1 chronic medical condition associated with increased risk of complicated influenza, including hypertension, chronic obstructive pulmonary disease (group A, B, E), asthma, congestive heart failure (ACC/AHA stage A, B, C, D), coronary arterial disease, diabetes mellitus, chronic liver disease (Child-Pugh score A, B, C) or chronic kidney disease (stage 1\~4), neuromuscular disorders, hematological or solid organ malignancies, recipient of hematopoietic stem cell transplantation or solid organ transplantation. Exclusion Criteria: * Contraindications to influenza vaccination including history of severe adverse event after vaccination, such as anaphylaxis or Guillain-Barré Syndrome, or a severe bleeding tendency * Prior receipt of influenza vaccination during the current flu season. * Determination by the Principal Investigator (PI) that the participant is ineligible for enrollment based on clinical assessment.

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Conditions

The condition(s) this trial relates to.

influenza prevention target

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Elderly Influenza vaccines

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • National Taiwan University Hospital

    RECRUITING

    Taipei, 100225, Taiwan

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