Wuhan, China, has been quarantined as the coronavirus outbreak grows. The city has 3 million more residents than New York City.

Emily Wang/AP Photo A mysterious coronavirus that originated in Wuhan, China, has killed 17 people and infected more than 639. The outbreak has spread to at least eight other countries, including the US. On Wednesday, local disease-control authorities in Wuhan issued an order to shut down the city's public transportation, including buses, trains, ferries, and the airport. The Wuhan coronavirus can pass from human to human, so officials are working to stop it from spreading further. Visit Busines...