We could improvise them though. I know in Hong Kong they have asked people to improvise using layered paper towels and tissues because those are readily available nonwoven fabrics.
It isn't as good as the real thing, but done at the population level I expect it would lower the reproductive value of the virus and thus help flatten the curve.
It isn't as good as the real thing, but done at the population level I expect it would lower the reproductive value of the virus and thus help flatten the curve.