Researchers modelling the spread of coronavirus emphasise the importance of avoiding busy indoor spaces
From this article by Science X:
"A joint project carried out by four Finnish research organisations has studied the transport and spread of coronavirus through the air. Preliminary results indicate that aerosol particles carrying the virus can remain in the air longer than was originally thought, so it is important to avoid busy public indoor spaces. This also reduces the risk of droplet infection, which remains the main path of transmission for coronavirus.
The researchers of the consortium modelled the airborne movement of aerosol particles smaller than 20 micrometres. For a dry cough, which is a typical symptom of the current coronavirus, the particle size is typically less than 15 micrometres. Extremely small particles of this size do not sink on the floor, but instead, move along in the air currents or remain floating in the same place. Studies of influenza A have confirmed that the influenza A virus can be found in the smallest particles, which measure less than 5 micrometres."
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