These are again a "simulation". Most people, probably 90% cover there mouth when sneezing so the simulation is not real world, plus the air vortex around any moving machine will pretty much invalidate the "simulation". Also what part of Covid-19 is spread from contact with your hands to your face from touching contaminated surfaces is not mentioned in any of the simulations. Understand the concerns but you could also under the right conditions be hit by a part falling from an airplane.
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