XBB.1.5 has rapidly replaced other variants in some European countries and in the Northeast U.S., according to the WHO—a growth advantage concerning experts.
fortune.com
Experts are eyeing the new Omicron strain XBB.1.5—
dubbed “Kraken” on the Twitterverse—for its potential to cause the next major COVID wave, thanks to its immune-escape ability and ultrahigh transmissibility.
The World Health Organization’s technical advisory group on virus evolution is
working on a risk assessment on the variant—the most transmissible yet, Maria Van Kerkhove, technical lead for COVID-19 response at the World Health Organization, said at a Wednesday news conference. Her organization has also asked the U.S. Centers for Disease Control and Prevention to report on the risks of the new variant, since XBB.1.5 has “rapidly replaced other variants” in some European countries and in the northeast U.S.
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When and where was XBB.1.5 discovered?
While it’s only recently taken off globally, XBB.1.5 has been around for a while. It was first detected—in the U.S.—on Oct. 22,
according to the European Centre for Disease Prevention and Control (ECDC).
How did it evolve?
XBB.1.5 is a “recombinant”—or combination—of two spinoffs of Omicron BA.2, which was known as “stealth Omicron” because it was difficult for labs to differentiate it from Delta.
What countries has it been located in?
So far, the U.S. is seeing the most notable growth of the new variant. This week, the CDC projected that it comprised around 75% of infections in regions 1 and 2, which include Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont, New York, New Jersey, Puerto Rico, and the U.S. Virgin Islands. Nationally, it was projected to be behind 41% of cases.
Some European countries are also seeing a steep rise in levels of Kraken, according to the WHO. The variant has so far been reported in 25 countries, which include Denmark, France, Austria, Netherlands, Germany, Italy, Spain, Sweden, Iceland, Belgium, Czechia, Portugal, and Ireland,
according to the ECDC.
Why is it so concerning?
In a Wednesday tweet, Dr. Ashish Jha, the White House’s COVID czar, called XBB.1.5’s rapid U.S. rise “stunning.”
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“We’ve not seen such rapid growth of a variant since Omicron BA.1 a year ago,” Dr. Eric Topol, a professor of molecular medicine at Scripps Research and founder and director of the Scripps Research Translational Institute,
tweeted last week.
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