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<blockquote data-quote="Umbran" data-source="post: 7952287" data-attributes="member: 177"><p>Well, let's talk about that a bit...</p><p></p><p>There are actually three questions involved in this:</p><p>1) How long is the virus "alive" (meaning, it is viable and can infect a person) on the surface in question?</p><p>2) How long is the virus <em>detectable</em> on the surface in question?</p><p>3) How well does the surface allow transfer of the virus to a human being?</p><p></p><p>For example, copper is a poor surface for covid-19 for both the first and second points - the metal is reactive, and that leads to quick chemical degradation in the presence of a moisture droplet.</p><p></p><p>Stainless steel and plastic are not reactive - so the virus lasts longer. But here, we should note that while they initially reported that the virus exists on stainless steel and plastic for days, that was about it being <em>detectable</em>/ - fragments of viral RNS could be found. We should then note that the <em>half-life</em> for the virus' existence on these surfaces is on the order of six hours or so. After just a few half-lives, while the virus is detectable by our measurements, the chances of someone getting infected from touching it has dropped significantly.</p><p></p><p>On cardboard, the virus lasts about a day - best explanation here is that the fibrous surface leeches moisture out of the droplets, drying them and allowing degradation on contact with air.</p><p></p><p>Animal fur may act a little like cardboard.</p><p></p><p>But, perhaps more importantly, animal fur may have the win on question (3). We should consider the structure of fur - which is basically hair. Fibers with tiny microscopic scales. Those scales likely hold onto tiny droplets or viral particles really well - better than the skin of your hand. So, in contact between fur and human skin... the viral particles are far more likely to stay on the fur.</p></blockquote><p></p>
[QUOTE="Umbran, post: 7952287, member: 177"] Well, let's talk about that a bit... There are actually three questions involved in this: 1) How long is the virus "alive" (meaning, it is viable and can infect a person) on the surface in question? 2) How long is the virus [I]detectable[/I] on the surface in question? 3) How well does the surface allow transfer of the virus to a human being? For example, copper is a poor surface for covid-19 for both the first and second points - the metal is reactive, and that leads to quick chemical degradation in the presence of a moisture droplet. Stainless steel and plastic are not reactive - so the virus lasts longer. But here, we should note that while they initially reported that the virus exists on stainless steel and plastic for days, that was about it being [I]detectable[/I]/ - fragments of viral RNS could be found. We should then note that the [I]half-life[/I] for the virus' existence on these surfaces is on the order of six hours or so. After just a few half-lives, while the virus is detectable by our measurements, the chances of someone getting infected from touching it has dropped significantly. On cardboard, the virus lasts about a day - best explanation here is that the fibrous surface leeches moisture out of the droplets, drying them and allowing degradation on contact with air. Animal fur may act a little like cardboard. But, perhaps more importantly, animal fur may have the win on question (3). We should consider the structure of fur - which is basically hair. Fibers with tiny microscopic scales. Those scales likely hold onto tiny droplets or viral particles really well - better than the skin of your hand. So, in contact between fur and human skin... the viral particles are far more likely to stay on the fur. [/QUOTE]
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