The subvariants known as BQ.1.1, BQ.1, BQ.1.3, BA.2.3.20 and XBB are among the fastest spreading of the main Omicron lineages. Based on UK data, the BQ variants, as well as BA.2.75.2 and BF.7 are the most concerning due to their growth advantage and immune evasiveness, the US health security agency has said. BF.7 has also been gaining ground in the US, where it accounted for 4.6% of Covid cases in the week ending October 8, from 3.3% the week before, according to the Centers for Disease Control and Prevention. In Bangladesh and Singapore, the XBB strain has been linked to a small surge in cases.
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