# Reduction in COVID-19 Infection Using Surgical Facial Masks Outside the Healthcare System

> **NCT04337541** · NA · COMPLETED · sponsor: **Rigshospitalet, Denmark** · enrollment: 6000 (actual)

## Conditions studied

- COVID-19

## Interventions

- **OTHER:** Surgical facial mask

## Key facts

- **NCT ID:** NCT04337541
- **Lead sponsor:** Rigshospitalet, Denmark
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2020-04-02
- **Primary completion:** 2020-06-02
- **Final completion:** 2020-06-02
- **Target enrollment:** 6000 (ACTUAL)
- **Last updated:** 2020-08-03

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04337541

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04337541, "Reduction in COVID-19 Infection Using Surgical Facial Masks Outside the Healthcare System". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT04337541. Licensed CC0.

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