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They should invent filters that you can put over your body parts that help stop transmission of COVID.
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Sounds nice, but how, exactly, would you filter a disease?
The engineering effort will be greatly reduced if you focus on filtering SARS-CoV-2 instead. It turns out that if you avoid SARS-CoV-2 infection, the COVID-19 disease will not develop. No need to overcomplicate the problem.
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