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a-c: Overall (gender independent) course of anti-SARS-CoV-2 antibodies: a) anti-NC IgG; b) anti-SP IgG; c) anti-SP IgA. Local Polynomial Regression Fitting with 2 standard errors (dotted lines). Anti-NC IgG showed a significant increase (weeks 3 to 5) before a significant decline (weeks 8 to 10, all p < 0•0075, Wilcoxon test, 1a), as did anti-SP IgG (weeks 4 to 6 and weeks 8 to 10, all p< 0•012, 1b). Note the dichotomous IgA distribution, 1c.
