Are masks effective against coronavirus?

Unchallenged

Coronavirus-carrying droplets may be prone to becoming aerosolised (suspended in the air), in which case masks would help.

A 2008 study of flu viruses found they can become aerosolised in exhalations without coughing or sneezing. While it remains an open question whether coronavirus can also be aerosolised, it may be wise to err on the side of caution and wear masks (given what we know about flu).

Sources