BTW, the NYC map of the virus spread looks basically like a subway map.
https://www.timeout.com/newyork/news/nyc....
And despite all this public BS claims about shutdown in NY, the subway is still running. My personal pet hypothesis is that it is all of the above (including hospitals and restaurants with poor hygiene) but first and foremost public transport.
I do expect the measures in NYC to work but very slowly and painfully compared to what would happen if they actually did shut it down for real.

And speaking of Petri dish in London, have a look at what they are doing with Javitz center in NYC.
https://abcnews.go.com/Politics/army-hel....
There is no way I can see to make that into a negative pressure facility. I do trust the Army Core of Engineers but I have my doubts about this one.