The Omicron subvariant, XBB.1.5, is causing concern among scientists after its rapid spread in the United States in December.
The World Health Organization's senior epidemiologist Maria Van Kerkhove said XBB.1.5 is the most transmissible Omicron sub-variant that has been detected so far. It spreads rapidly because of the mutations it contains, allowing it to adhere to cells and replicate easily.XBB and XBB.1.5 were estimated to account for 44.1% of COVID-19 cases in the United States in the week of Dec. 31, up from 25.9% in the previous week, according to data from the U.S.
"We do expect further waves of infection around the world, but that doesn't have to translate into further waves of death because our countermeasures continue to work," said Van Kerkhove, referring to vaccines and treatments. Virologists agree that the emergence of the new subvariant does not mean there is a new crisis in the pandemic. New variants are to be expected as the virus continues to spread.
"There is no reason to think that XBB.1.5 is of any more concern than other variants that come and go in the ever-changing landscape of COVID-19 mutants," said Professor Andrew Pollard, director of the Oxford Vaccine Group.The WHO's Technical Advisory Group on Virus Evolution is doing a risk assessment on the subvariant. Van Kerkhove said on Wednesday it hoped to publish that in the next few days.
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