A cluster randomised trial of cloth masks compared with medical masks in healthcare workers | BMJ Open

C Raina MacIntyre1, Holly Seale1, Tham Chi Dung2, Nguyen Tran Hien2, Phan Thi Nga2, Abrar Ahmad Chughtai1, Bayzidur Rahman1, Dominic E Dwyer3, Quanyi Wang4

Conclusions – This study is the first RCT of cloth masks, and the results caution against the use of cloth masks. This is an important finding to inform occupational health and safety. Moisture retention, reuse of cloth masks and poor filtration may result in increased risk of infection

A cluster randomised trial of cloth masks compared with medical masks in healthcare workers | BMJ Open