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Anti-SARS-CoV-2 IgA in NP swabs from asymptomatic Delta variant SARS-CoV-2 infections. IgA capable of binding (a) the SARS-CoV-2 S1 protein or (b) the SARS-CoV-2 RBD was measured via flow cytometry. Symbols represent individual subjects, midlines represent the mean, error bars represent the standard deviation, and dashed lines represent the lower limit of the assay. Unvaccinated and vaccinated groups were compared by Mann–Whitney test. ns = p > 0.05, ** = p < 0.01.
