Professor David Heymann (adviser to the World Health Organisation – WHO) says that wearing a mask is more efficient than keeping a 1.5m distance.

People keep coming out on the street and coughing around. Not everyone is as careful and coughs in the elbow or in a handkerchief. Mouth masks can be a greater obstacle to the virus in places where many people pass by, such as shops, busy streets and public transport.

Research shows that you stop 99% of drops if you cover your face with a piece of fabric. Even without coughing, infected people spread drops when speaking or breathing that can spread corona viruses.