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Simple text reminders boost flu vaccination rates in older adults

NCT ID NCT06626321

Prevention Sponsor: University of Pennsylvania Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether sending text message reminders to patients and nudging their doctors could increase flu vaccination rates. Over 26,000 adults aged 50 and older took part. The approach used simple, low-cost tools like pre-visit texts and automatic vaccine orders in the electronic health record.

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

26,248 people

The number who actually took part.

Started

Oct 2024

Finished

May 2025

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

50 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: All patients must meet the following criteria to be eligible: 1. Age ≥ 50 years 2. A scheduled new or return (non-urgent/sick) primary care appointment at one of the study practices at Lancaster General Health 3. Have not received their annual flu vaccine during the active intervention period (September- February) 4. Eligible to receive the flu vaccine For the patient intensification nudge, at least one of the following criteria must be met to be considered high risk and randomized to receive the intensification nudge: 1. Age ≥ 70 years 2. Living in a lower income community (lowest quartile, zip-code based) 3. Did not receive a flu vaccine in the previous calendar year 4. Self-identifies as Non-Hispanic Black Clinicians must meet the following criteria to be eligible to receive peer comparison feedback: 1. Practicing physician (MD, DO) or advanced practice provider (NP, PA) with the exception of residents and fellows 2. Have a minimum patient panel of at least 50 patients, and 3. Practicing at a clinical site randomized to receive the clinic-level nudge interventions. Exclusion Criteria: Patients will be excluded from the study if they: 1. Have a documented allergy to flu vaccine 2. Have a flu vaccine exclusion modifier in Health Maintenance 3. Have opted out of research according to individual site guidelines and policies 4. Have no phone number (home or mobile) listed in their chart

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Conditions

The condition(s) this trial relates to.

Health Behavior influenza prevention target

As listed by the trial registrant

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

Behavior, health Flu Flu vaccination

Contacts and locations

Locations

  • Lancaster General Health

    Lancaster, Pennsylvania, 17602, United States

More trials for these conditions

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