Virus levels in the air are an intermediate outcome (e.g. cholesterol). The primary outcome (e.g. myocardial infarction) we care about is reduced infections. Do the RCT. There is no better time to do a HEPA clinical trial. Industry (Tyson's, HEPA companies) should fund RCTs
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Replying to @eliowa
Sure ... do RCT’s but don’t say dumb things like HEPA filters might do harm. We know they improve health relative to air quality. If you eat the filter it would be bad for you. Virus removed from air would lower exposure and thus infections. That will happen. Physics.
1 reply 0 retweets 1 like -
Replying to @clarkvangilder
Certainly they can do harm. In the broader picture, they could create a false sense of safety. And if added to a building with radiator heat, they could increase air circulation, which could be harmful depending on where you sit up/down wind
4 replies 0 retweets 6 likes
Every dollar spent on a useless intervention is a dollar that could be spent on something useful. The opportunity cost cannot be overstated
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