Ryanair boss Michael O’Leary’s claim on BBC Radio 4’s Today programme that if everyone wore face masks on planes and public transport, it would ”eliminate the risk of spreading Covid-19 by about 98.5%”, is being called into question.

Prof Paul Hunter, who has conducted a review into mask studies, told the BBC he could ”find no valid data to support the claims”. He adding that his ”best guess” would be that wearing face masks would cut transmission by 10% to 15%.

Some major US airlines now require their passengers to wear masks or face coverings.

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