The director-general of the WHO on Sunday warned that the virus being transmitted by people who have not been to China could be the "tip of the iceberg".
"There've been some concerning instances of onward 2019nCoV spread from people with no travel history to China," Tedros Adhanom Ghebreyesus wrote on Twitter
"The detection of a small number of cases may indicate more widespread transmission in other countries; in short, we may only be seeing the tip of the iceberg."
Meanwhile in Hong Kong, passengers on a quarantined cruise ship have been allowed to disembark after tests showed no infection among them or its crew.
The World Dream had been held in isolation after eight passengers from a previous cruise had caught the virus.
South Korea has issued a temporary ban on cruise ships entering its ports due to fears of spreading the virus.
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