A virus called 2019-nCoV that emerged last month in Central China is spreading so fast that it risks becoming a global epidemic. More than 500 cases have been confirmed in China alone, and at least 17 people have died. This is an unwelcome development as the Chinese head into the Lunar New Year holiday, also their busiest travel season of the year. People are canceling trips and avoiding places such as shopping centers, which could hurt the share prices of travel and retail companies. Healthcare stocks, in contrast, are experiencing a boost.

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