The US State Department has issued a level four warning to Americans about travelling to the epicentre of the coronavirus outbreak in China.
It's the highest warning level possible and has been issued for the Hubei province where Wuhan is located, but the alert level for the entire country has also been raised.
The coronavirus outbreak has now killed more than 80 people and infected thousands across China as it spreads globally.
"Chinese authorities have imposed strict travel restrictions in the area around Wuhan. Travellers should be aware that the Chinese government could prevent them from entering or exiting parts of Hubei province," the advisory said.
US authorities have warned against all non-essential travel to anywhere in China, with a level three warning for all other provinces aside from Hubei.
On Monday, New Zealand's Ministry of Foreign Affairs (MFAT) reviewed its advice for Kiwis travelling to China. It said New Zealanders should not travel to Hubei Province, and should "exercise normal safety and security precautions" in other parts of the country.
MFAT confirmed there are currently 21 New Zealanders in Wuhan and that the New Zealand Embassy in Beijing is providing assistance to these individuals and families.