Use of anti-nucleocapsid antibody detection as a marker of SARS-CoV-2 infection in healthcare professionals: a longitudinal seroprevalence study at a university hospital in Catalonia, Spain.

BMC Infect Dis · 2026 · PMC12973790 · PMID 41652586

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a clear trendno p-value reported

A clear trend of antibody waning was evident in the seropositive group: the median COI for the Anti-N positive cohort decreased significantly from 91.1 at P1 to 34.3 at P2, indicating a substantial decline in antibody concentrations over the study duration.

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