Donald Trump sought to downplay the coronavirus risk to US citizens after placing vice president Mike Pence in charge of his nation's response.
The US president insisted the threat to Americans from Covid-19 remained "very low" and an outbreak was not inevitable.
But health officials in the country pushed for the public to prepare for further cases.
Commenting on the virus spreading across the US, Mr Trump said: "It probably will, it possibly will. It could be at a very small level, or it could be at a larger level. Whatever happens we’re totally prepared."
President Trump's press conference was described as "incoherent" by Dr Ezekiel Emanuel, an adviser to the World Health Organisation, who blasted him as "ignorant to the situation" as he spoke to MSNBC.
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