https://www.wired.com/story/travel-bans-and-quarantines-wont-stop-coronavirus/

The national plan to try to stop the new coronavirus from spreading any further might fracture international trade, violate people’s rights, and make untenable the workloads of local and state public health departments. It almost certainly won’t slow the virus.

That’s the word from people trying to sort out what US secretary of health and human services Alex Azar announced last Friday. The plan: Starting last Sunday, US citizens who’ve been to Hubei Province in China (the apparent center of the outbreak), get 14 days of mandatory quarantine when they return home. US citizens who’ve been anywhere in China get health screening at airports and 14 days of self-quarantine—staying home, basically, with health workers monitoring them. Noncitizens who’ve been to China in the last two weeks are banned from entering the country.