Cases have been confirmed in several regions of France and it appears to have been circulating since early January.
In a briefing on 9 March, the World Health Organisation (WHO) said the strain had also been found in the Netherlands and Denmark.
There are two confirmed cases in the US with a number of other suspected infections.
And last month, the UK Health Security Agency (UKHSA) revealed one case of Delta x Omicron had been discovered in a person who had contracted both variants.
Scientists says the variant's "backbone" is derived from Delta while its spike - the part of the virus that attaches itself to human cells - is from Omicron.
Combined viruses come about when someone is infected with two variants at the same time, and their cells then replicate together.
Maria van Kerkhove, the COVID technical lead for the WHO, said this mutation was "to be expected, especially with intense circulation of Omicron & Delta".
She added that her team was "tracking and discussing" the variant
In a briefing on 9 March, the World Health Organisation (WHO) said the strain had also been found in the Netherlands and Denmark.
There are two confirmed cases in the US with a number of other suspected infections.
And last month, the UK Health Security Agency (UKHSA) revealed one case of Delta x Omicron had been discovered in a person who had contracted both variants.
Scientists says the variant's "backbone" is derived from Delta while its spike - the part of the virus that attaches itself to human cells - is from Omicron.
Combined viruses come about when someone is infected with two variants at the same time, and their cells then replicate together.
Maria van Kerkhove, the COVID technical lead for the WHO, said this mutation was "to be expected, especially with intense circulation of Omicron & Delta".
She added that her team was "tracking and discussing" the variant