probably been posted before, but there is an MIT study floating around that strongly implies that the New York mass transit system spread, and is spreading the virus around.
Here is the link to that study, and a link to a list of the busiest mass transit systems in the US.
Seems that cities with big ridership are prone to be hotspots, as opposed to places like Seattle, Dallas etc....
Perhaps the bus and subway systems should be shut down...
http://web.mit.edu/jeffrey/harris/HarrisJE_WP2_COVID19_NYC_13-Apr-2020.pdf
https://en.m.wikipedia.org/wiki/List_of_United_States_rapid_transit_systems_by_ridership