It's only an 18-second video clip but it is being hailed on social media as the best advice you can have for avoiding spreading the coronavirus.
Graham Medley, Professor of Infectious Disease Modelling, told BBC Newsnight people shouldn't act like someone who is avoiding contracting the virus but rather as
someone who already has the virus and is trying not to pass it onto others.
The advice, hailed as "probably the best single piece of advice I've heard about the #coronavirus" by a Twitter user, has been shared thousands of times in just a few hours.
"Most people have a fear of acquiring the virus. I think a good way of doing it is to imagine that you do have the virus, and change your behaviour so that you're not transmitting it," he said.