Public health agencies recommend that people at higher risk of severe illness should stay home and away from large groups of people as much as possible, including public places with lots of people and large gatherings where there will be close contact with others. This includes concert venues, conventions, sporting events, and crowded social gatherings.
People at higher risk include those:
Over 60 years of age
With underlying health conditions including include heart disease, lung disease, or diabetes
With weakened immune systems
Who are pregnant
https://healthy.kaiserpermanente.org/alerts/p1/2019-novel-coronavirus-feb-2020