Effectiveness and acceptability of an opt-out nudge to promote influenza vaccination among medical residents: A randomized controlled trial.
VaccineJun 30, 2026 (epub)
Clinical ResearchPreventive Medicine / Public Health
Adriaan Barbaroux, Ilaria Serati, Isabelle Milhabet
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In 30 seconds
This randomized controlled trial assessed the effectiveness and acceptability of an opt-out nudge to enhance influenza vaccination rates among 260 medical residents in France. The results indicated that only 5% of residents in the nudge group were unvaccinated compared to 27% in the control group, suggesting an 81% potential reduction in unvaccinated residents. Residents reported high acceptability of the nudge.
Key findings
- 5% of residents in the nudge group were unvaccinated versus 27% in the control group.
- Applying the nudge could have reduced unvaccinated residents by 81%.
- Residents found the nudge very acceptable and felt it did not reduce their autonomy.
- A positive correlation was found between autonomy, nudge acceptability, and effectiveness.
Why it matters
Understanding the effectiveness and acceptability of nudges can help healthcare systems improve vaccination rates among medical professionals, ultimately enhancing public health outcomes.