Time to encourage people to wear face masks as a precaution, say experts
https://www.sciencedaily.com/releases/2020/04/200409105405.htm
Professor Trisha Greenhalgh at the University of Oxford and colleagues say despite limited evidence, masks "could have a substantial impact on transmission with a relatively small impact on social and economic life."
The question of whether masks will reduce transmission of covid-19 in the general public is contested.