Humoral Immunity Elicited by the XBB.1.5 Monovalent COVID-19 Vaccine

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AI-generated summary by claude@2026-07, 2026-07-15

The XBB.1.5 monovalent COVID-19 vaccine boosted IgG, IgA, and total IgG/A/M antibodies against the spike receptor-binding domain and increased neutralizing titers against multiple SARS-CoV-2 variants.

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Abstract

As novel SARS-CoV-2 variants continue to emerge, the updated XBB.1.5 monovalent vaccines remain to be evaluated in terms of immunogenicity against live clinical isolates. We report boosting of IgG(2.1X), IgA(1.5X), and total IgG/A/M(1.7X) antibodies targeting the spike receptor-binding domain and neutralizing titers against WA1(2.2X), XBB.1.5(7.4X), EG.5.1(10.5X), and JN.1(4.7X) variants.

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last seen: 2026-05-20T01:45:00.602351+00:00