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Longitudinal profile of serum and respiratory secretion neutralization after SARS-CoV-2 infection among 26 participants presenting with mild (n = 5, green), moderate (n = 15, orange), and severe (n = 6, red) COVID-19. Abbreviations: COVID-19, coronavirus disease 2019; Ig, immunoglobulin; MFI, mean fluorescence intensity; RBD, receptor-binding domain; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
