At least one person has died in the United Kingdom (UK) after contracting the Omicron coronavirus variant, Prime Minister Boris Johnson said on Monday, the first publicly confirmed death globally from the swiftly spreading strain.
Since the first Omicron cases were detected on 27 November in Britain, Johnson has imposed tougher restrictions and on Sunday cautioned that the variant could overcome the immune defences of those inoculated with two shots of vaccines.
Britain gave no details on the death other than the person had been diagnosed in hospital. It was not clear if the patient had been vaccinated or had underlying health issues.
Deaths from Omicron may have occurred in other countries but none has been publicly confirmed yet outside Britain.
"Sadly at least one patient has now been confirmed to have died with Omicron," Johnson told reporters at a vaccination centre in London.
"So I think the idea that this is somehow a milder version of the virus - I think that's something we need to set (to) one side - and just recognise the sheer pace at which it accelerates through the population."
Health Secretary Sajid Javid said the variant now accounted for 44 percent of infections in London and would be the dominant strain in the capital within 48 hours. New Omicron infections are estimated at 200,000 per day, Javid said.
Before the death was announced, Britain said 10 people had been hospitalised with Omicron in various parts of England. Their ages ranged from 18 to 85 years and most had received two vaccination doses.
The UK Health Security Agency said Omicron - first detected in South Africa, Botswana and Hong Kong in late November - can overcome the immunity of those who have had two shots of vaccines such as AstraZeneca or Pfizer-BioNTech.
South Africa's health ministry said it was unable to say with certainty if any of its COVID-19 deaths were caused by Omicron as deaths were not broken down by variant.
The World Health Organization said on Sunday that while preliminary findings from South Africa suggest Omicron may be less severe than the Delta variant - currently dominant worldwide, and all cases reported in the Europe region have been mild or asymptomatic, it remains unclear to what extent Omicron may be inherently less virulent.