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The more infectious Omicron variant of COVID-19 appears to produce less severe disease than the globally dominant Delta strain, but should not be categorised as "mild", World Health Organization (WHO) officials said on Thursday.

Janet Diaz, WHO lead on clinical management, said early studies showed there was a reduced risk of hospitalisation from the variant first identified in southern Africa and Hong Kong in November compared with Delta.

There appears also to be a reduced risk of severity in both younger and older people, she told a media briefing from WHO headquarters in Geneva.

She did not give further details about the studies or the ages of the cases analysed, but the impact on the elderly is one of the big unanswered questions about the new variant as most of the cases studied so far have been in younger people.

Top WHO, US scientists say Omicron no worse than other virus variants

Speaking at the same briefing in Geneva, director general Tedros Adhanom Ghebreyesus said the variant should not be considered "mild" as global infections soar to records, healthcare systems are overwhelmed and governments struggle to tame the virus, which has killed more than 5.8 million people.

He repeated his call for greater equity globally in the distribution of and access to vaccines.

Based on the current rate of vaccine rollout, 109 countries will miss the WHO's target for 70% of the world's population to be fully vaccinated by July, Tedros added. That aim is seen as helping end the acute phase of the pandemic.

WHO adviser Bruce Aylward said 36 nations had not even reached 10 percent vaccination cover. Among severe patients worldwide, 80% were unvaccinated, he added.

Another variant - labelled as IHU and first registered in September 2021 - is among those being monitored by the WHO but is not circulating widely, said the WHO's technical lead on COVID-19, Maria van Kerkhove.

There are two other categories of greater significance the WHO uses to track variants "variant of concern", which includes Delta and Omicron, and "variant of interest".

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