China reports 73 more deaths from a new virus, raising its total to 563.
The director-general of the WHO, Tedros Adhanom Ghebreyesus, asked for $675 million to help countries address the expected spread of the virus.
According to the latest figures early Thursday, the number of confirmed cases jumped by 3,694 to 28,018.
China has strongly defended its epidemic control measures and called on other nations not to go overboard in their responses.