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Decrease in NAb levels in patients with COVID-19. A, Comparison of NAb levels between the peak point and the follow-up time point 2. B, Percentage decrease in NAbs in patients with COVID-19. Abbreviations: COVID-19, coronavirus disease 2019; ID50, 50% inhibitory dose; NAb, neutralizing antibody; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
