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> Covid 19 is a different virus and the interventions of a flu pandemic are not going to yield the same results.

The results don't have to be identical. As long as a benefit exists and it can help reduce the major problems we're facing right now it's worth it.

> Infection is a binary status. You are either infected or not.

The amount of virus matters in if you get infected or not. The more you do to reduce the amount of virus that is in the air the better. You are correct that you can't expect perfect protection from a mask while standing in a fog of virus, but that's rarely the scenario people experience. Masks have been shown again and again to he effective at helping prevent the spread of covid. I wouldn't feel comfortable sitting in a classroom with 40-60 other kids while there were thousands of new infections every day in my community, but if I were forced to, I'd make damn sure I had a mask on. What's the alternative?