The tweeted illustration doesn't indicate whether the spreader of infection moved from his/her chair. If the real story is that A1 walked to other tables to talk, then maybe the conclusion to draw is that moving bodies spread droplets along their path of motion, and therefore>
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I'm sure the cloth masks you have "evidence" about are just fine for what you want to achieve and always will be. You have no evidence about the actual DIY masks people are wearing as they impose themselves on others, stenuously exercising, moving through public places. Thanks!
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A. Exercisers only respire about 2X resting rate. B. They're trailing that respiration across 3X-8X the distance as a walker. IOW, *much* lower density of droplets. See upthread for HK estimate of contact needed for transmission: 15+ min of close contact.
End of conversation
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