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Herd Immunity and Influenza Vaccine Uptake

NCT03748160 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 48125

Last updated 2025-08-20

No results posted yet for this study

Summary

The aim of this study is to test the effectiveness of communicating the concept of herd immunity on actual influenza vaccine uptake using a randomized controlled trial.

Conditions

  • Influenza, Human

Interventions

OTHER

Letter

Intervention consists of two different types of postal letters reminding elderly citizens (65 years and above) about influenza vaccines that are available free of charge from the local health centers

Sponsors & Collaborators

  • RWTH Aachen University

    collaborator OTHER

  • University of Erfurt

    collaborator UNKNOWN

  • Finnish Institute for Health and Welfare

    lead OTHER_GOV

Principal Investigators

  • Cornelia Betsch, PhD · University of Erfurt

  • Robert Böhm, PhD · RTWH Aachen University

  • Hanna Nohynek, PhD · Finnish Institute for Health and Welfare

  • Saila Pitkänen, MSc · Finnish Institute for Health and Welfare

  • Heini Salo, PhD · Finnish Institute for Health and Welfare

  • Lauri Sääksvuori, PhD · Finnish Institute for Health and Welfare

  • Jonas Sivelä, PhD · Finnish Institute for Health and Welfare

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
65 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2018-10-01
Primary Completion
2019-06-01
Completion
2019-12-31

Countries

  • Finland

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03748160 on ClinicalTrials.gov