Hamsters placed in adjoining cages with infected subjects were infected at a 66.7 per cent rate; the introduction of a barrier saw the percentage drop to 16.7%.

The study, which the team called the first of its kind, found the rate of non-contact transmission – in which the virus was transmitted via respiratory droplets or airborne particles – dropped by as much as 75 per cent when masks were present.

“I know wearing masks will be difficult during the summer time. My advice is especially when you are in an indoor or closed environment where there’s no free air exchange, in crowded places or on public transport, you must wear a mask.”