Christmas travel plans will increase the spread of the Omicron Covid-19 variant, even among the fully vaccinated, the top US infectious disease expert Dr Anthony Fauci has said.

"There's no doubt about this, [Omicron] has an extraordinary capability of spreading," Dr Fauci told NBC.

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, with France and Germany among those to issue travel restrictions and the Netherlands has imposed a strict lockdown over Christmas.

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