> All the evidence I've seen is quite clear; masks are effective. Isn't there a lot of nuance to that, in the sense that it depends on other factors? As far as

> All the evidence I've seen is quite clear; masks are effective. Isn't there a lot of nuance to that, in the sense that it depends on other factors? As far as I understand it, the advisory body in the Netherlands (which sounds like it's in a similar situation to Sweden) does consider masks to be effective, but marginally so, in the sense that compared to social distancing, they are far less effective in combating the spread. And since they can't tell for sure yet to what extent the wearing of masks affects people's adherence to social distancing, they are afraid that mandating masks might be counterproductive if it leads to less distancing.