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. 2021 Jan 4;12:63. doi: 10.1038/s41467-020-20247-4

Fig. 4. Antibody responses (ELISA) in COVID-19 patients by days after illness onset and severity, Hong Kong (n = 231 samples).

Fig. 4

The black lines showed the fitted values and gray areas showed the 95% confidence intervals. ELISA assays were carried out in duplicate.