An Experiment Comparing Public Reactions to the Labels "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."

Not Yet Recruiting

Trial opening soon.

Get Notified

Key information

Conditions

Attitudes Behavior

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

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"

Herd immunity

Behavioral

Using the traditional term "herd immunity"

Primary outcomes

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).

Study contacts

Contact information is provided by the study sponsor or research team.

Holly Witteman, PhD

CONTACT

[email protected]

418-656-2131

Sponsors and collaborators

Lead sponsor

Laval University

Other

Registry information

Official study title

Community Immunity Versus Herd Immunity

Important dates

Study start: 2025
Primary completion: 2025
Study completion: 2025
First posted: Aug 3, 2025
Registry last updated: Aug 3, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Not Yet Recruiting