Comments by "N Marbletoe" (@nmarbletoe8210) on "Wednesday 8th April Global Update" video.
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@moanamason2454 Sure, but that was on surfaces right? I think it would survive on surfaces much longer than in the air, due to particle size.
Virions are killed by exposure to oxygen and ultraviolet light. The smaller the particle of snot, the faster the virus inside it will die from exposure. To stay in the air a long time a particle of snot must be very small. So, particles small enough to blow between towns probably die quickly on the way.
Then there's a matter of dilution. A puff of smoke in Santa Fe, by the time it reaches Albuquerque, is too dilute to matter. The dilution factor would be interesting to estimate. Back of envelope:
All this depends on temperature too. A frozen virus could last a long time, perhaps indefinitely. I imagine that to save virus in the research lab, they freeze it. However, freezing only protects it from oxygenation; it would still be killed by UV light even if it was sitting on a block of ice.
Fundamentally, disease organisms have to deal with two facts 1) they want to live in a body, which is dark and wet with little dissolved oxygen, but 2) to get from body to body they have to go through the deadly world that is light and dry and highly oxygenated. This means that they can be defeated.
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