Tiny drops of infected saliva are the likely reason, but aerosolized particles aren't ruled out.
in the New England Journal of Medicine. Tests also found that cardboard could not sustain infectious levels of the virus for 24 hours, and copper couldn’t do it for four hours.The amount of virus the researchers used in their experiments was meant to mimic the amounts typically found in the respiratory tracts of COVID-19 patients. However, if the researchers had started out with even more, the virus could have remained viable for a longer period of time.
Also, the time periods reported in the study reflect the specific conditions used in the experiment; if variables such as temperature or humidity were different, the results might be different too.For hours, potentially.
Scientists made it airborne in the study Lloyd-Smith co-wrote. Indeed, they showed just how the virus can survive as an aerosolized particle.An aerosolized particle is much smaller than a droplet. It can float and fly in a room for hours, much like an aerosolized air freshener. A droplet, meanwhile, is large enough that it drops to the ground by gravity within seconds.We were discussing the lab experiment.
Of the original amount of coronavirus sprayed into the mist, half of it remained after roughly one hour. So by the end of the three-hour experiment, roughly one-eighth of the initial amount still remained. In real-life conditions where there’s fresh air or ventilation, any virus in a mist will get diluted pretty quickly. But in theory, if you’re in an elevator or a subway car with limited ventilation, the virus could hang out in the air for a while, Lloyd-Smith said.He also noted that scientists aren’t sure how much virus it takes for a person to become infected.Measles ranks among the most infectious diseases.
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