New COVID 'Variant of Concern' XBB May Lack Surge Potential
XBB has been on the CDC’s radar since earlier this month, when it first began doubling its case counts every 12 days. It is a combination of two Omicron subvariants (BA.2.10.1 and BA.2.75) first seen in September and is among a growing group that could render some antibody treatments ineffective.