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

NCT07102472 | Not Yet Recruiting

• 1 other identifier: commimm
• Study Type: interventional
• Target: 350
• Locations: 0 countries
• Sites: N/A

Brief Summary

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."

Conditions

Attitudes

Outcome Measures

Primary Outcomes (1)

• Orientation towards protection of others

  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

Study Arms (2)

Herd immunity

PLACEBO COMPARATOR

Behavioral: Herd immunity

Community immunity

EXPERIMENTAL

Behavioral: Using the term "community immunity" instead of "herd immunity"

Interventions

Using the term "community immunity" instead of "herd immunity" BEHAVIORAL

In the intervention arm, participants are shown the less traditional term "community immunity" in place of the more traditional "herd immunity"

Community immunity

Herd immunity BEHAVIORAL

Using the traditional term "herd immunity"

Herd immunity

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

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

You may not qualify if:

• \- Unable to view images on a computer

Sponsors & Collaborators

• Laval University: lead

MeSH Terms

Conditions

Behavior

Interventions

Immunity, Herd

Intervention Hierarchy (Ancestors)

Immunity; Immune System Phenomena

Central Study Contacts

Holly Witteman, PhD

CONTACT

418-656-2131; holly.witteman@fmed.ulaval.ca

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: July 28, 2025
• First Posted: August 3, 2025
• Study Start: July 22, 2025
• Primary Completion: August 31, 2025
• Study Completion: August 31, 2025
• Last Updated: August 3, 2025

Record last verified: 2025-07

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, ICF, ANALYTIC CODE
• Time Frame: IPD and supporting information will be available when the study report is complete.
• Access Criteria: Anyone with internet access will be able to access the public-facing file. Some data may require access through Borealis registration.