Should runners wear masks?

Professor Trish Greenhalgh tells @piersmorgan and @susannareid100 that it is 'important to be socially responsible' due to the way Covid transmits.

Amid the fears that a wet mask can breed germs, she says the mask should be washed straight away. pic.twitter.com/kGeRCZT3in

— Good Morning Britain (@GMB) March 2, 2021