Your regular reminder that we've known for some time that SARS-CoV-2 isn't "airborne" in the colloquial sense, the debate is about communication rather than science
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Like, the disease is spread through droplets in the air, and how small those are and how far they travel is a matter of great debate, but there's never been any question that COVID-19 is less infectious than "airborne" diseases like measles
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So while we may need to change messaging to encourage mask wearing, it's never been likely that, for example, you'd catch COVID-19 from someone walking 100m away
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Replying to @GidMK
Not likely, but also not impossible, if the wind happens to be blowing just the right way.
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Replying to @mgubrud
Nothing's impossible, but in most places where contact tracing has been sufficiently good the vast majority of cases are from close contacts rather than happenstance interactions
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Replying to @GidMK
True, but there are always a large fraction where the origin can't be identified. The point I made is relevant to large crowds where there might be someone infected upwind of you in almost any direction the wind might blow.
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Replying to @mgubrud
Well in Australia the unknown contact cases make up only ~10% of all cases, not sure if that's a large fraction in this definition. And yes as I said it's ~possible~ but we're really more interested in whether it's likely or common
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Replying to @GidMK
10% is a very substantial number. But the main point is we should (and do) warn people against large crowds.
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Sure, but that's not 10% caused by unknown transmission, it's 10% where we haven't been able to track back to a specific outbreak. In some states that number is almost 0% here. Not saying crowds are safe, obviously
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