What percent of each of these populations is infected? Wuhan has been in lockdown for six weeks, its not lifted. And obviously they still have many millions old

What percent of each of these populations is infected? Wuhan has been in lockdown for six weeks, its not lifted. And obviously they still have many millions older than 65 who haven't been infected, they have no immunity. Lift the lockdown with even one infected person escaping, and the epidemic ignites again. And this is way more problematic in the U.S. are we going to have lockdowns everyone there's a flare up? How's that going to work?