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Omicron still poses 'very high' risk and could overwhelm healthcare systems, the WHO warned on Wednesday, as the highly transmissible coronavirus variant fuelled record outbreaks in many countries.

Case numbers have shot up 11 percent globally in the last week, forcing governments from China to Germany and France to find a difficult balance between anti-virus restrictions and the need to keep economies and societies open.

The Netherlands and Switzerland said Omicron had become the dominant strain in their countries, and while some studies suggested it causes milder Covid-19, the World Health Organization urged caution.

'The overall risk related to the new variant of concern Omicron remains very high,' the UN health agency said in its Covid-19 weekly epidemiological update.

'Consistent evidence shows that the Omicron variant has a growth advantage over the Delta variant with a doubling time of two to three days.'

The WHO said early data from Britain, South Africa, and Denmark - which currently has the world's highest rate of infection per person - suggested there was a reduced risk of hospitalization for Omicron compared with Delta.

But it added that further data was needed to understand Omicron's severity.

And despite those studies, Omicron's rapid growth 'will still result in large numbers of hospitalizations, particularly amongst unvaccinated groups, and cause widespread disruption to health systems and other critical services', warned WHO Europe's Covid Incident Manager Catherine Smallwood.

Painful restrictions

Europe was again one of the hotspots for the pandemic, which is known to have claimed more than 5.4 million lives around the world.

France, Britain, Greece and Portugal all reported record daily case numbers on Tuesday. France reported almost 180,000 infections over 24 hours.