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The new coronavirus has been declared a global emergency by the World Health Organization, as the outbreak continues to spread outside China.
"The main reason for this declaration is not what is happening in China but what is happening in other countries," said WHO chief Tedros Adhanom Ghebreyesus.
The concern is that it could spread to countries with weaker health systems.
The first human-to-human transmission of the deadly Wuhan coronavirus has occurred in the U.S., the Centers for Disease Control and Prevention announced Thursday.
The respiratory virus was spread from a woman who had recently traveled in China to her husband when she returned to Chicago, CDC Director Dr. Robert Redfield said at a press briefing.
It's the sixth confirmed case of the new coronavirus, or 2019-nCoV, in the U.S.