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. 2021 Sep 28;41(8):1723–1732. doi: 10.1007/s10875-021-01134-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — S1-specific IgA response in nasal wash and serum. S1-specific IgA (A) and total IgA (B) were measured by ELISA in nasal wash (NW). The dotted line represents the maximum value detected in the negative samples for S1-specific IgA (0.4). C S1-specific IgA OD ratio values in sera. The dotted line represents the detection level of the Euroimmune assay in serum (0.8). Nasal wash samples are represented as circles and serum samples are represented as triangles. Dark green for total IgA. Light green for S1-specific IgA. Gray for the control