By Helen Regan, Jessie Yeung, Steve George & Fernando Alfonso

The latest: At least 259 people are dead and more than 12,000 cases have been confirmed in mainland China, as the virus spreads globally.

Travel ban: The US is imposing a travel ban on foreign nationals who have been in China in the past 14 days.

Evacuations amid a lockdown: Nearly 60 million people have been under partial or full lockdown in Chinese cities for a week. Several countries are sending planes to evacuate foreign citizens under lockdown in Wuhan.