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Analysis of the circulating antibodies in asymptomatic and symptomatic COVID-19 patients. The bar diagram representing circulating antibody isotypes (IgA, IgM, IgG1, IgG2, IgG3, IgG4, and IgE) which were evaluated from COVID-19-positive plasma samples. The Mann–Whitney (non-parametric, two-tailed) test was performed. p < 0.05 was considered statistically significant (*), and p < 0.005 was considered to be very significant (**). ns, not significant. All error bars were SD.
