This is a compelling piece about why we should all wear face masks in public, by @trishgreenhalgh, Oxford Prof of primary care. It is to protect others from us, if we have the virus and cough, rather then to protect ourselves. It is to massively slow... https://www.fast.ai/2020/04/13/masks-summary/

the spread of #covid19 so that the rate of transmission - the famous R0 - falls to less than 1. Many of you have been in touch with me outraged that @CMO_England @uksciencechief @MattHancock and @DominicRaab haven’t ordered compulsory mask wearing or at least recommended...

it. But there has been a shift. Deputy CMO Jonathan Van Tam said there was no case for mask wearing about ten days ago. Yesterday @uksciencechief said there may be a case. In Austria for example, which today is starting a process of gradually coming out of lockdown...

it is obligatory to wear masks in supermarkets and pharmacies. According to Greenhalgh, cotton ones are best for slowing the spread. So is it time we all wore masks when out and about? What do you think?