Adam and I have already sparred over masks, so I won't spend much time here. But it remains to be seen how effective they are in tropical settings with temps constantly ~32 C. Sweaty masks and increased respiratory strain are not conducive.
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Replying to @jon_y_huang @zeynep and
I will say I really hope masks are it, but I fear it's a bit of target fixation. There are varying degrees of timing and efficacy of test, trace, isolate that are being painted with broad strokes. (Though not by you, I love your coverage so far!)
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Replying to @jon_y_huang @zeynep and
One thing that hasn't had as much attention and tough to parse is the effect of rush of travellers avoiding bans, mandatory quarantine, etc. We saw it acutely in the US and elsewhere. How did this "bolus challenge" shift trends?
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Replying to @jon_y_huang @zeynep and
Understand this: nobody is saying masks are the only differentiator. The graphic wanted to change US policy which specifically used to say that masks don’t work, which every civilized Asian country knows is false. Nobody has to convince anyone about efficacy of contract tracing
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Replying to @riskdesigner @JPerla and
I don't want to be glib about this, but your banner suggests you feel otherwise. No one has ever said masks don't work. They said improper wearing may cause harm. Perhaps none of the tropical Asian countries have mask culture for a reason?pic.twitter.com/dZlx7L0vEO
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Replying to @jon_y_huang @JPerla and
Jon, do you have a reference for the claim that improper wearing causes harm? I've seen many make that claim, but yet to see any evidence.
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Replying to @adamcchang @JPerla and
The main routes I would consider are self contamination https://bmcinfectdis.biomedcentral.com/articles/10.1186/s12879-019-4109-x … and increased respiratory rate (cite to come)
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Replying to @jon_y_huang @adamcchang and
I agree there are real issues for self-contamination for health-care workers (around infected patients with high-viral doses all day...). We had doffing infection in SARS, too. Haven't seen a good general public imperfect mask wearing versus no masks study. Wish we had one.
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Replying to @zeynep @adamcchang and
As a former firefighter / paramedic I have worn from SCBAs to masks to N95. Preventing contact and proper wear is not trivial even with training
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Replying to @jon_y_huang @zeynep and
Adam has actually linked to the definitive (so far) Cochrane review and meta analysis. There is one cluster RCT in a dorm. It shows...at least they aren't harmful wrt ILI.
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Yeah, indeed protecting oneself in a high-risk situation is hard. But these masks are for source control—asymptomatic, presymptomatic spread plus cover for sick people to wear one without stigma. If they shift the risk distribution a little bit to the safer side, seem a win.
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Replying to @zeynep @adamcchang and
Yes! Agreed. See my last point on this.
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