Omicron and Delta variants may strike people at the same time and combine to create an even worse Covid variant in the coming weeks – Moderna boss warns
One of Moderna’s bosses has warned that Omicron and Delta variants may strike people at the same time and combine to create an even worse Covid variant in the coming weeks.
Covid infections normally only involve one mutant strain, but in extremely rare cases two can strike at the same time.
Dr. Paul Burton, the vaccine maker’s chief medical officer, warned the high numbers of Delta and Omicron cases currently circulating in Britain made this more likely.
He told MPs on the Science and Technology Committee that it was ‘certainly’ possible they could swap genes and trigger an even more dangerous variant.
Researchers have warned that these events, scientifically called ‘recombination events’, are possible but they require very specific conditions and the coincidence of mostly uncontrollable events.
Only three Covid strains created by viruses swapping genes have ever been recorded, with the virus instead mostly relying on random mutations to make more variants.
A new variant was not triggered over the two months when the Delta strain was outcompeting Alpha through this method.
Omicron is already dominant in London just two weeks after being spotted in the country, and experts estimate it will be the main strain by the New Year.
Dr. Burton told the Commons that having the two variants circulating together raised the risk of them swapping genes and making a new variant.
He said: ‘There’s certainly data, there have been some papers published again from South Africa earlier from the pandemic when people and certainly immunocompromised people can harbour both viruses.
‘That would be possible here, particularly given the number of infections that we were seeing.’
Asked whether this may lead to a more dangerous variant, he said it ‘certainly could’.
Most places have dominant variants so getting infected with two strains at the same time is unlikely.
And, for healthy people, there is thought to only be a window of around two weeks from one infection being triggered before the body starts to develop immunity and successfully clears out the first version.
However, huge and uncontrolled outbreaks like the ones in the UK and US last winter do raise the risk of recombination events simply because the number of infections is higher.
Britain currently has 4,713 Omicron cases confirmed to date, and the variant is behind about one in five cases nationally.
In one case a recombination event occurred in the UK when the Alpha variant merged with B.1.177, which first emerged in Spain, in late January.
It led to 44 cases before eventually disappearing.
Scientists in California said they had identified another recombination variant in early February, with the Kent strain merging with B.1.429 which was first spotted in the area.
This new strain also led to very few cases and quickly disappeared.
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