Maybe we will need to consider the role of A/C for indoors, and focus on behavior, not just size. If it were classic aerosol (to stabilize terminology, say, < 5 μm) spread for Guangzhou case, why were only people down-wind of the A/C currents infected, but not one table over?
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So while many public health experts/virologists and others have been trying to communicate the nuanced info, the official/WHO messaging remains confusing and only recently had the short-range aerosol transmission that I've been hearing experts from Hong Kong etc. for months.
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(Of course, experts like on this thread can adjust language to communicate with each other but for public health, I wish there was consistent and simple messaging around *behavior*, and to date that message from WHO is droplet/fomite focused. May change with recent update!).
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Agree on that situation. WHO has issued recs on ventilation, our group helped them with those. But ppl don't understand **WHY**, have not made effort to implement, bc it is not clear WHY one would need to do that, if "FACT: NOT AIRBORNE" Once ppl understand, they take seriously!
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The danger there is when people hear "AIRBORNE" many think of that scene in Outbreak when Dustin Hoffman looks up at the vent and realizes that this is going to spread to the whole hospital. This isn't that, nor is it measles, but also not just WHO's initial ballistic droplets.
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The restaurant, call center, and choir practice all suggest inhaled droplets--whether ballistic or aerosol--are an "airborne" mode of transmission but it's also true that fomites can't be conclusively ruled out. That was obvious to me and why this has been so confusing.
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I think everyone understands that this virus can be transmitted by airborne routes. I can't speak to WHO's problems communicating that, but it's not shocking that a respiratory virus is airborne. The terminology is what is making this conversation so confusing.
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I'd be nice to have a guideline for amount of ventilation. Kinda line the 6ft rule. It seems the more the better is most often the advice, but in AZ more ventilation means hotter inside (unless the recommendation is more filtering. Someone mentioned merv 13 air filters.)
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