This implies that ‘medical masks’ should be worn by those at risk, to prevent them becoming infected 2/npic.twitter.com/oKjA1wcUVi
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I'm risk-averse myself, when it comes to evidence. For example, I'd been tweeting to be wary of the HCQ harms arguments from that observational Lancet study (long before it was retracted) because.. Exactly. Not highest quality evidence, given they unblinded RCTs & found no harms.
Look at this new preprint. They find, quite unsurprisingly, that masks *increase* distancing. I've been arguing this for months based on social science evidence! This is what you'd expect, not false sense of security nonsense. But all this was disregarded. https://arxiv.org/pdf/2005.12446.pdf …pic.twitter.com/k7f0ZiQQ4s
Why? The evidence of harms in a complex system can be far more difficult to prove b/c you don't know where the risk comes from with so many variables. Hence the precautionary principle be very cautious with any intervention b/c chances are you will probably not forsee the risk.
Precautionary principle in a middle of a deadly pandemic says you go ahead with basically zero risk interventions that have a preponderance of evidence under a very plausible mechanism—source control. (I mean, I can make up dangers from hand-washing too, if I really tried).
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