A change in China's Covid-19 policy has led to tighter travel restrictions in the US.
From January, people arriving from China will need to show a negative test within two days of arrival to the US.
It follows China ditching mandatory isolation for those infected with the virus.
US Correspondent Richard Arnold says cases are rising rapidly there.
He told Tim Beveridge that's translating to serious infection rates amongst travellers. Arnold says on a recent flight out of China half the passengers had the virus.
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