The time to act was weeks ago. We haven't even stopped international flights in from Milan.
https://flightaware.com/live/flight/UAE205/history/20200310/...
https://flightaware.com/live/flight/UAE205/history/20200310/...
Also the quality of the response matters
China closed Wuhan, but the US still allowed flights without monitoring
And there are still not enough test kits to go around