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Flu vaccine under the microscope: does it protect hospitalized patients?

NCT ID NCT01764152

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 well the seasonal flu vaccine worked during the 2012-2013 flu season in adults who were hospitalized with flu-like symptoms. Researchers compared vaccinated and unvaccinated patients across a network of French hospitals to see if the vaccine reduced confirmed flu cases. The goal was to measure vaccine effectiveness in a real-world hospital setting.

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

450 people

The number who actually took part.

Start date

Dec 2012

Finished

May 2013

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

18 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: * Age ≥ 18 year * Affiliated with social security health insurance * Written informed consent * Patients hospitalized for 24 hours and presenting an influenza-like illness in the last 7 days before the hospitalization Exclusion Criteria: * Against indication for influenza vaccination(Hypersensitivity to the active substances, to any of the excipients and to trace eg eggs, including ovalbumin, chicken protein) * Patients institutionalized without regular community interaction * Patient already hospitalized for respiratory infection during the 2012-2013 influenza season * Flu already virologically documented in the current influenza season 2012-2013 (RT-PCR, multiple RT-PCR and / or culture.)

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Conditions

The condition(s) this trial relates to.

influenza

As listed by the trial registrant

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

Adult hospitalized

Contacts and locations

Locations

  • Institut National de la Santé Et de la Recherche Médicale

    Paris, 75654, France