All infected people in Wuhan being ’rounded up’
https://www.theguardian.com/world/live/2020/feb/18/coronavirus-outbreak-updates-coronavirus-live-updates-hubei-deaths-china-wuhan-outbreak-apple-iphone-death-toll-latest-news?page=with:block-5e4b41488f0811db2faf996d#block-5e4b41488f0811db2faf996d

Well, at least the Chinese government has plenty of practice doing this.