China has become an indispensable part of global business since the 2003 SARS outbreak. It's grown into the world's factory, churning out products such as the iPhone and driving demand for commodities like oiland copper. The country also boasts hundreds of millions of wealthy consumers who spend big on luxury products, tourism and cars. China's economy accounted for roughly 4% of world GDP in 2003; it now makes up 16% of global output.
SARS sickened 8,098 people and killed 774 before it was contained. The new coronavirus, which originated in the central Chinese city of Wuhan, has already killed more than 900 people and infected over 40,000 across at least 25 countries and territories. Chinese officials have locked down Wuhan and several other cities, but the virus continues to spread.