By Deena Beasley
(Reuters) – U.S. Centers for Disease Control and Prevention said on Thursday that it was tracking a new, highly mutated lineage of the virus that causes COVID-19.
The lineage is named BA.2.86, and has been detected in the United States, Denmark and Israel, the CDC said in a post on messaging platform X.
“As we learn more about BA.2.86, CDC’s advice on protecting yourself from COVID-19 remains the same,” the agency said.
The World Health Organization (WHO) earlier on Thursday said in a post on X that it had classified BA.2.86 as a “variant under monitoring” due to the large number of mutations it carries.
The WHO said that, so far, only a few sequences of the variant have been reported from a handful of countries.
The new lineage, which has 36 mutations from the currently-dominant XBB.1.5 COVID variant “harkens back to an earlier branch” of the virus, explained Dr. S. Wesley Long, medical director of diagnostic microbiology at Houston Methodist.
He said it remains to be seen whether BA.2.86 will be able to out-compete other strains of the virus or have any advantage in escaping immune responses from prior infection or vaccination.
Early analysis indicates that the new variant “will have equal or greater escape than XBB.1.5 from antibodies elicited by pre-Omicron and first-generation Omicron variants,” Jesse Bloom, a virologist at the Fred Hutchinson Cancer Center said in a slide deck published on Thursday.
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The Omicron subvariant XBB.1.5 is the strain targeted by vaccines in upcoming COVID booster shots.
Bloom’s slides note that the most likely scenario is that BA.2.86 is less transmissible than current dominant variants, so never spreads widely, but more sequencing data is needed.
“My biggest concern would be that it could cause a bigger spike in cases than what we have seen in recent waves,” Dr. Long said. “The boosters will still help you fight off COVID in general.”
(This story has been corrected to fix the name of the COVID variant to XBB.1.5 in paragraphs 6 and 8, the name of Fred Hutchinson Cancer Center in paragraph 8, and typos for BA.2.86 in paragraph 7)
(Reporting by Shivani Tanna in Bengaluru; Editing by Himani Sarkar & Simon Cameron-Moore)
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