Can a simple mask stop the flu? 2,000 volunteers put it to the test
Prevention
ENROLLING_BY_INVITATION
This trial asks whether wearing a surgical mask every day can prevent acute respiratory infections like influenza and COVID-19. About 2,000 adults who normally don't wear masks will be randomly assigned to either wear a mask when outdoors or continue without one for 3–4 months du…
Phase: NA • Sponsor: Chiba University • Aim: Prevention
Last updated Aug 05, 2026 00:00 UTC