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. 2021 Apr 7;11:7614. doi: 10.1038/s41598-021-87289-6

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© The Author(s) 2021

Open Access This 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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Schematic overview of samples and antibody detection tests. IFA immunofluorescence assay. *32/72 samples collected 1–21 days post symptom onset, 65/129 samples collected ≥ 22 days post symptom onset, and 7/19 samples lacking information regarding elapsed time between symptom onset and sampling.^†126/129 samples collected ≥ 22 days post symptom onset.^‡15/72 samples collected 1–21 days and 94/129 samples collected ≥ 22 days post symptom onset.