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Your phone could be the nudge that gets you vaccinated

NCT ID NCT02908893

Prevention Sponsor: Evidation Health 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 18, 2026 · Last updated Sep 18, 2026

Summary

Researchers test whether short messages sent through a mobile wellness app can increase flu vaccination rates among insured adults. The messages, delivered as push notifications and in-app posts, either highlight incentives or use generic wording. The study compares vaccination rates and flu-related medical visits between people who receive messages and those who do not.

What this could mean

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

Active substance
Short mobile app messages and push notifications delivered through a wellness program app
What this could lead to
If it works, this could offer a low-cost way for insurers and health programs to nudge more people toward flu shots and other preventive care.
What could go wrong
Messages may be ignored or fail to change vaccination behavior. The study measures vaccination rates and flu events, but it cannot prove that any change is caused by the messages alone.

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

50,286 people

The number who actually took part.

Started

Sep 2016

Finished

Jun 2017

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

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

Ages

18 to 65 years

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: * belongs to fully insured population * continuous health coverage between January 1, 2015 and June 1, 2016 * has downloaded and installed the wellness platform app Exclusion Criteria: * has declined the messaging from the platform

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Conditions

The condition(s) this trial relates to.

influenza prevention target

As listed by the trial registrant

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

Not condition-specific

Contacts and locations

Locations

  • Evidation Health

    Santa Barbara, California, 93101, United States