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The order of a text message may decide whether someone gets a COVID test

NCT ID NCT05451511

Prevention Sponsor: Washington University School of Medicine Source: ClinicalTrials.gov ↗

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 10, 2026 · Last updated Sep 11, 2026 · Updated 1 time

Summary

Researchers in St. Louis are studying whether the order of offers in a text message changes how people respond to COVID-19 testing and vaccination help. Participants are adults applying for rent or utility assistance in St. Louis City or County. Each person gets a survey with two offers, and the order of those offers varies. The study tracks whether people accept a free at-home test kit or a call from a vaccine navigator, and follows up a month later to ask about their experience.

What this could mean

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

Active substance
Sequential request strategies delivered by text message, including the door-in-the-face and foot-in-the-door techniques
What this could lead to
If one message order works better, health agencies could use it to pair COVID-19 testing and vaccination offers with the rent and utility help people already seek.
What could go wrong
The study measures whether people say yes to an offer, not whether they complete vaccination or testing. Text message wording may work differently in other cities or for other health services.

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

526 people

The number who actually took part.

Started

Jul 2022

Finished

Sep 2022

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

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: * Applicants for rent and utility assistance in St. Louis City or County * English language proficiency * Be willing to be contacted via text message or email * Resident of St. Louis City or County Exclusion Criteria: * N/A

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Conditions

The condition(s) this trial relates to.

Behavior Communication COVID-19 prevention target

As listed by the trial registrant

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

Behavior and behavior mechanisms Communication

Contacts and locations

Locations

  • Washington University in St. Louis

    St Louis, Missouri, 63130, United States

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