–12 In contrast, memory responses to respiratory syncytial virus decrease over the course of this timeframe13. ,14 The memory B-cell response to SARS-CoV-2 progresses for 1.3 months and 6.2 months after infection in a manner that is consistent with antigen persistence15. It has been shown that SARS-CoV-2-specific IgA serum concentration declined 1 month after the onset of symptoms; however, neutralizing IgA persists from days 49 to 73 after symptoms16. The persistence of memory B-cell subsets has been reported by different studies, but the data are still not completely clear.11 Here, CD79A is linked to infection.