Yeah, every country is different isn't it. Sorry to hear of your own predicament man, all the best and let's hope it's not as long a haul...
Having lived in a major Chinese city, and seen how the majority of the population (even relatively rich people) live in tower blocks due to lack of space.....its easy to lock down a city like that. All you need really is 2-3 armed police officers per tower block, at the entrance/exit, and you're literally quarantinining a good 500-1000 people in one easy swoop. Repeat that for every tower block in the city and you've quarantined millions of people with a few hundred police officers, give or take.
To do the same in the West with sprawling neighbourhoods, housing areas, is next to impossible unless you're deploying hundreds of officers to each town. They'd have to be 'on the move' non-stop in cars (main roads) and on foot (elsewhere). Not feasible.