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It certainly dampens the case for the use of masks to prevent catching the virus, but that is not really their primary intended purpose (from the CDC site: 'Masks are primarily intended to reduce the emission of virus-laden droplets '). I agree with you that hopefully there are more tests in the pipeline.
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Maybe I'm mis-interpreting the findings, but do they take into account whether the the rest of the public (not involved in the study) were also wearing a mask? As far as I'm aware, masks are recommended to stop an individual spreading the virus to others when they exhale, rather than stopping them catching it from others when they inhale.
Edit: should've read further.
Here, we report a randomized controlled trial (20) that assessed whether a recommendation to wear a surgical mask when outside the home among others reduced wearers' risk for SARS-CoV-2 infection in a setting where public health measures were in effect but community mask wearing was uncommon and not recommended.
I guess it still doesn't answer the question of how effective it is if everyone wears masks though.
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Are you assuming we can all afford an iPhone because you can?
In the COVID 19 thread you assumed everyone in the UK had internet access because "I've never met anybody in the last 5 years who didn't have access to the internet.".
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In the middle of September deaths were around 3% higher than five year average. November 8th it was up to around 30%. But it has dropped slightly over the last recorded week. Data from here.