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Flu shot study reveals how age and prior vaccines shape immunity

NCT ID NCT01063608

Knowledge-focused Sponsor: Institut National de la Santé Et de la Recherche Médicale, France Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 26, 2026

Summary

This completed study looked at how 147 healthy hospital workers responded to the seasonal flu vaccine and the H1N1 pandemic vaccine. Researchers measured antibody and cellular immune responses, focusing on how age and previous flu vaccinations affected those responses. The goal was to better understand immunity patterns to help guide public health vaccination strategies.

What this could mean

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

Active substance
Anti-H1N1v Vaccine (biological) and seasonal influenza vaccine
What this could lead to
If successful, this study could help public health officials better understand how age and past flu shots affect immune responses, potentially improving future vaccination strategies.
What could go wrong
This is a completed observational study, not a treatment trial. It measures immune markers, not clinical outcomes like preventing illness, so results may not directly change practice.

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

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

147 people

The number who actually took part.

Start date

Oct 2009

Finished

May 2010

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

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

Ages

20 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Healthy volunteers * Age superior or equal to 20 years * Women with childbearing potential using contraception Exclusion Criteria: * Documented immune depression * Current immunosuppressive therapy * Pregnancy (documented by a positive pregnancy test) * Breast feeding women * Documented allergy or hypersensitivity to vaccines * Documented acute or chronic inflammatory disease * Concomitant participation to another clinical trial

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Conditions

The condition(s) this trial relates to.

swine influenza influenza prevention target

As listed by the trial registrant

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

Influenza A virus, H1N1 subtype

Contacts and locations

Locations

  • Centre d'Investigations Cliniques (CIC), Hopital Cochin

    Paris, Île-de-France Region, 75014, France

  • Hopital Pitie Salpetriere

    Paris, Île-de-France Region, 75013, France