Scientists and health authorities around the world are racing to halt the spread of a deadly virus that emerged in the Chinese city of Wuhan in December. Thousands of people have already contracted the new coronavirus, which causes respiratory illness. The death toll is at 213, and is rising daily. On 30 January, the World Health Organization (WHO) declared the outbreak a “public-health emergency of international concern” — an alarm it reserves for events that pose a risk to multiple countries and which requires a coordinated international response.
Crucial details about the virus and how it spreads are still unknown, but experts are considering best- and worst-case scenarios on the basis of previous epidemics and what scientists already know.
主要关注以下四个问题：
How many people will the virus infect?
Is the virus here to stay?
Is the virus likely to change?
How many people will it kill?
