Study reveals poor immunity against SARS-CoV-2 BQ.1.1 and XBB mutants in Norway By admin | January 9, 2023 0 Comment Researchers conducted a seroprevalence study in the general population of Norway, evaluating immunity against multiple subvariants of SARS-CoV-2 Omicron, including XBB and BQ.1.1 mutants.