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. 2022 Dec 9;76(8):1391–1399. doi: 10.1093/cid/ciac934

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Published by Oxford University Press on behalf of Infectious Diseases Society of America 2022.

This work is written by (a) US Government employee(s) and is in the public domain in the US.

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Figure 5. — A, B, Plasma severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) anti-spike antibody levels, measured in light units (LUs), are correlated with nasal (A) and saliva (B) anti-spike antibody levels in unvaccinated infected persons. C, D, Nasal SARS-CoV-2 anti-spike antibody is correlated with saliva anti-spike antibody (C), and plasma anti-spike antibody with nasal immunoglobulin (Ig) A anti-spike antibody (D) in unvaccinated infected persons. Data points represent results for individual participants (22 participants in A and C, 23 in B, and 21 in D), and vertical dotted lines represent cutoff levels for a positive plasma anti-spike antibody assay result.