What do we know about the new coronavirus?

The ultrastructural morphology exhibited by the 2019 Novel Coronavirus (2019-nCoV), which was identified as the cause of an outbreak of respiratory illness first detected in Wuhan, China, is seen in an illustration released by the Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia, U.S. January 29, 2020. Alissa Eckert, MS; Dan Higgins, MAM/CDC/Handout via REUTERS

(Reuters) - A new coronavirus that has killed 213 people in China is spreading to other countries, alarming healthexperts.

Here is some of what we know - and don't know - about the virus: