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Message: <blockquote data-quote="zubenelgenubi" data-source="post: 4666254" data-attributes="member: 63706">They know. It's already been confirmed in laboratory tests. 1000 to 10,000,000 virions per aerosolized droplet sized 1 to 10 microns. Each aerosolized droplet has enough virions to give a person breathing it in a 50/50 chance of being infected, and only 1 virion is all that is required to infect a person. Cloth coverings and medical grade masks don't stop that many droplets at that size range. Just take a breath out in the cold with your mask on. And those droplets stay suspended in the air for a very long time.N95s still let 5% at that range through. The fact that masks catch a lot of droplets is irrelevant to the spread of viruses. It's just not enough. There's a reason researchers in virology labs wear this:[ATTACH=full]315739[/ATTACH]</blockquote>