The latest COVID variant of concern, XBB.1.5, continues to rise but still makes up a minority of new COVID-19 infections across the country, the CD estimated.
"We've been tracking XBB for weeks as I said, and it was XBB and XBB.1, and they really weren't taking off. They weren't increasing rapidly in proportion," said Mahon.Before evolving into XBB.1.5, XBB had already ranked among the strains with the largest immune-evasion relative to earlier major Omicron strains. XBB appeared to beto a roster of monoclonal antibody drugs that doctors had relied on earlier in the pandemic before they were sidelined by new variants.
However, antibody responses in that study were also worse for XBB compared to the other strains they studied.
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