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Could a simple link change boost vaccine trust?

NCT ID NCT07532967

Knowledge-focused Sponsor: University of Essex 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested how different web link formats in vaccination invitation emails affect trust and willingness to book an appointment. Over 1,200 participants from the UK and US viewed one of three email versions with different link styles. The goal is to find the most trustworthy design to improve digital health communication.

What this could mean

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

What this could lead to
If successful, this research could help public health agencies design more trustworthy digital invitations, potentially increasing vaccination uptake.
What could go wrong
This is a completed online experiment with hypothetical scenarios, not a real-world trial. Actual behavior may differ from stated intentions.

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

1,203 people

The number who actually took part.

Started

Jan 2022

Finished

Jan 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: * Residency: Must be a resident of either the United Kingdom or the United States Exclusion Criteria: * Attention Failure: Participants who failed the designated attention check included within the survey will be excluded from the analysis. * Speeding: Participants who completed the study "too fast"- indicating a lack of meaningful engagement with the experimental stimuli - were filtered out

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As listed by the trial registrant

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

Vaccination

Contacts and locations

Locations

  • University of Essex

    Colchester, Essex, CO4 3SQ, United Kingdom

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