# Herd Immunity and Influenza Vaccine Uptake

> **NCT03748160** · NA · COMPLETED · sponsor: **Finnish Institute for Health and Welfare** · enrollment: 48125 (actual)

## Conditions studied

- Influenza, Human

## Interventions

- **OTHER:** Letter

## Key facts

- **NCT ID:** NCT03748160
- **Lead sponsor:** Finnish Institute for Health and Welfare
- **Sponsor class:** OTHER_GOV
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2018-10-01
- **Primary completion:** 2019-06-01
- **Final completion:** 2019-12-31
- **Target enrollment:** 48125 (ACTUAL)
- **Last updated:** 2025-08-20

## Collaborators

- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03748160

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03748160, "Herd Immunity and Influenza Vaccine Uptake". Retrieved via AI Analytics 2026-07-06 from https://api.ai-analytics.org/clinical/NCT03748160. Licensed CC0.

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