Face masks cut disease spread in the lab, but have less impact in the community. We need to know why

 I will still wear one when going shopping, but they are difficult to keep on all the time in social situations or at work. If I'm around a lot of people I shall still wear one. I've never worn one in the street, except in very crowded ones, as it intuitively seemed to be pointless. Some people wear them in their cars even though they are the only person in it. 

We carried out a comprehensive review of the evidence about how face masks and other physical interventions affect the spread of respiratory viruses. Based on the current evidence, we believe the community impact is modest and it may be better to focus on mask-wearing in high-risk situations.

Face masks cut disease spread in the lab, but have less impact in the community. We need to know why