An Experiment Comparing Public Reactions to the Labels "Community Immunity" Versus "Herd Immunity".

July 28, 2025 updated by: Laval University

Community Immunity Versus Herd Immunity

Participants are shown a scenario consisting of static images from a previous study ("herdimm") showing a visualization of how herd immunity works. Participants are randomized to see the text with the term "herd immunity" or "community immunity."

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

350

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Able to use a computer
  • Able to use the internet
  • Able to read and respond to questions in English or French
  • 18+ years old and living in Canada

Exclusion Criteria:

- Unable to view images on a computer

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Health Services Research
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Herd immunity
Behavioral: Herd immunity
Using the traditional term "herd immunity"
Experimental: Community immunity
Behavioral: Using the term "community immunity" instead of "herd immunity"
In the intervention arm, participants are shown the less traditional term "community immunity" in place of the more traditional "herd immunity"

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Orientation towards protection of others
Time Frame: Immediately after the intervention
A measure of the extent to which people believe that individual vaccination behavior is important to protect others. Question wording: "When a safe and effective vaccine exists that can prevent people from catching and passing on a contagious disease, it is important for people to get vaccinated to protect ..." Measured across two to three items (family, others in the community, people who are more vulnerable to disease) on a 7-point Likert-type scale (strongly disagree = 1, strongly agree = 7).
Immediately after the intervention

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Laval University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 22, 2025

Primary Completion (Estimated)

August 31, 2025

Study Completion (Estimated)

August 31, 2025

Study Registration Dates

First Submitted

July 28, 2025

First Submitted That Met QC Criteria

July 28, 2025

First Posted (Actual)

August 3, 2025

Study Record Updates

Last Update Posted (Actual)

August 3, 2025

Last Update Submitted That Met QC Criteria

July 28, 2025

Last Verified

July 1, 2025

More Information

Terms related to this study

Other Study ID Numbers

  • commimm

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Anonymized data will be deposited on Borealis, Laval University's official data repository.

IPD Sharing Time Frame

IPD and supporting information will be available when the study report is complete.

IPD Sharing Access Criteria

Anyone with internet access will be able to access the public-facing file. Some data may require access through Borealis registration.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • ICF
  • ANALYTIC_CODE

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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