Masks work – face shields, not so much

I have written about masks and COVID-19 before – how using masks lower risk and why a much reported paper wouldn’t be able to say anything about masks – but now someone has made actual experiments with droplets to see which protect most.

The paper is “Inward and outward effectiveness of cloth masks, a surgical mask, and a face shield” and it seems to show that masks work well to protect in indoor settings. The droplets assumed to transmit COVID-19 are 1-2 microns or larger, so obviously surgical masks work very well.

Might be why they have been in use at hospitals for all these years.

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