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A nudge in the mailbox: could a letter boost flu shots for millions at risk?

NCT ID NCT07798882

Prevention Sponsor: Geisinger Clinic 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 02, 2026 · Last updated Sep 03, 2026 · Updated 1 time

Summary

This trial tests whether mailed letters, patient portal messages, or texts can encourage flu vaccination among adults with multiple risk factors for severe influenza. Researchers will identify high-risk patients using a simple rule-based scoring system, then send reminders and track whether they get a flu shot. The goal is to see if low-cost, non-algorithmic nudges can improve vaccination rates in a vulnerable population.

What this could mean

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

Active substance
Behavioral intervention: mailed letter, patient portal message, and/or text message reminding high-risk patients to get a flu shot
What this could lead to
If effective, simple reminders could significantly increase flu vaccination rates among vulnerable adults, reducing flu-related hospitalizations and complications.
What could go wrong
The trial is early and relies on voluntary behavior change; reminders may not sway everyone, and results may vary across different patient groups.

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 51,215 people

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

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Sep 2026

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

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 or older * Has four or more CDC risk factors for influenza reflected in EHR data * Has a primary care physician employed by Geisinger * Attended at least one appointment at Geisinger between 7/17/2024 and 7/16/2026 * Attended at least one primary care appointment at Geisinger between 10/1/2008 and 7/16/2026 Exclusion criterion: \- Attended an appointment at Community Care between 9/1/2024 and 7/16/2026

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Conditions

The condition(s) this trial relates to.

Health Behavior Risk Reduction Behavior influenza prevention target

As listed by the trial registrant

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

Health behavior Health promotion Influenza Risk reduction Vaccination

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

  • Geisinger Health

    Danville, Pennsylvania, 17822, United States

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