The CNN article has a picture of what a Boston homeless shelter looks like: https://cdn.cnn.com/cnnnext/dam/assets/200417103746-01-pine-street-homeless-shelter

The CNN article has a picture of what a Boston homeless shelter looks like: https://cdn.cnn.com/cnnnext/dam/assets/200417103746-01-pine-street-homeless-shelter-boston-2018-exlarge-169.jpg https://cdn.cnn.com/cnnnext/dam/assets/200417103746-01-pine-... So yeah, it's a bunch of tightly packed beds. One or two asymptomatic carriers can probably infect hundreds in just a night.