US doctors have found applying surgical tape to a mask on the bridge of the nose is a simple, low-cost way to ensure people wear the face covering correctly.

Doctors from the ED at Sidney & Lois Eskenazi Hospital, Indianapolis, where everyone was required to wear a mask, recruited 123 patients who were not seriously ill.

They randomly assigned them either to wear their mask as usual, or to have the mask fastened to the bridge of the nose with a piece of surgical tape. 

Patients could either wear their own mask, or a mask provided by the hospital.