timelets

Unlike severe acute respiratory syndrome (Sars), which causes infections deep in the lower respiratory tract that can result in pneumonia, Covid-19 appears to inhabit both the upper and lower respiratory tracts.

That would make it capable of not only causing severe pneumonia, but also spreading easily like flu or the common cold.

... Singapore’s Ministry of Health (MOH) emphasised on Thursday that the publication recognised close contact and respiratory droplets are still the predominant mode of transmission for the virus.

MOH said the publication also contained three caveats for aerosol transmission: That it is possible with prolonged exposure, through high concentrations, and in a closed environment.

An example of such an environment would be an Intensive Care Unit (ICU).

https://www.straitstimes.com/asia/east-asia/coronavirus-spreads-more-like-flu-than-sars-chinese-study
https://www.nejm.org/doi/full/10.1056/NEJMc2001737

Ok. The study would explain the recent death of the Chinese neurosurgeon and the need to wear masks.