Christmas travel will increase the spread of the Omicron Covid-19 variant, even among the fully vaccinated, the top US infectious disease expert says.
"There’s no doubt about this, [Omicron] has an extraordinary capability of spreading," Dr Anthony Fauci told NBC’s Meet the Press programme on Sunday.
Dr Fauci, who advises the US government on the pandemic, said the variant was now "raging through the world".
Countries are tightening measures as the heavily mutated variant spreads.
US President Joe Biden is set to detail the country’s response to Omicron in a speech on Tuesday.
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