Evaluating memory B cell cross-reactivity between ancestral and future SARS-CoV-2 variants — evidence for original antigenic sin 2219641
To investigate whether human donors with verified SARS-CoV-2 infection in early 2022, likely with Omicron (BA.1), generated variant-specific Bmem responses or whether WH1-reactive Bmem were preferentially boosted, a novel ImmunoSpot assay was established to assess cross-reactivity at single-cell resolution.