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Online network tweak may boost vaccine acceptance in at-risk groups

NCT ID NCT04779827

Knowledge-focused Sponsor: University of Pennsylvania 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether changing how people interact in online social networks can improve their attitudes and intentions toward COVID-19 vaccination. Over 4,400 adults in the US with internet access will be placed into different online groups and answer health questions while seeing feedback from others. The goal is to see if less centralized and more diverse networks help reduce vaccine hesitancy and health inequities.

What this could mean

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

Active substance
Online social network intervention
What this could lead to
If successful, this could show that adjusting online social networks helps reduce vaccine hesitancy and health inequities in underserved communities.
What could go wrong
This is a behavioral study, not a medical treatment. Results depend on self-reported attitudes and may not lead to actual vaccination changes or generalize beyond this online setting.

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

4,476 people

The number who actually took part.

Started

May 2021

Expected to finish

Mar 2027

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

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: * Having internet access * Aged 18 and above * Living in the United States Exclusion Criteria: * Having no internet access * Aged below 18 * Living outside of the United States

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Conditions

The condition(s) this trial relates to.

COVID-19 heart disorder Vaccination Refusal

As listed by the trial registrant

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

COVID19 Heart diseases Vaccination refusal

Contacts and locations

Locations

  • Annenberg School for Communication

    Philadelphia, Pennsylvania, 19104, United States

More trials for these conditions

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