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Flu's hidden toll on ERs revealed in new study

NCT ID NCT04153331

Knowledge-focused Sponsor: Hospices Civils de Lyon 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This study tracked nearly 2,500 adults who came to the emergency room during flu season to see how many actually had the flu. By testing everyone with a nasal swab, researchers aimed to find flu cases that might otherwise go unnoticed. The goal is to give hospitals a clearer picture of flu's real impact on emergency services.

What this could mean

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

What this could lead to
If successful, this study could help hospitals better predict and prepare for flu seasons by understanding the true number of flu-related emergency visits.
What could go wrong
This is an observational study, not a treatment trial. It only measures what happens, so it cannot directly improve patient care or outcomes.

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

2,487 people

The number who actually took part.

Started

Jan 2020

Finished

Mar 2020

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

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 years * Consultation for a medical cause Exclusion Criteria: * Consultation for a non-medical cause (trauma...) * Pregnant, parturient and lactating women * Persons deprived of their liberty * Persons of full age who are subject to a legal protection measure * Persons not affiliated to a social security system

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Conditions

The condition(s) this trial relates to.

Emergencies influenza

As listed by the trial registrant

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

Emergencies Flu

Contacts and locations

Locations

  • Service Hygiène, Epidémiologie et Prévention

    Lyon, 69003, France

More trials for these conditions

Other studies related to the condition(s) this trial covers.