If I’m correct, and I’m not sure about the full scope of this, the Israelis are tracking infections and separating the infected from their families.
NY is planning on doing the same, with the key word being planning. Bloomberg is donating money for a tracking system, which may turn out to be better than the Israeli system, but by the time all the details are worked out it may no longer be necessary.
Basically speed is the name of the game. NY missed by a long shot. By the time we blinked, we were in way too deep, with nobody in charge to know how to grab the bull by the horns. And of course, the American culture isn’t set up for such levels of control, so it wouldn’t have been an easy feat in any case.