These large variations can be also observed in the reported results from previous studies using the peripheral blood of COVID-19 convalescent patients, in which a general trend toward declining SARS-CoV-2–specific CD8+ memory T cell response is observed from statistical analysis on the peripheral blood of two large cohort of patients between 1 and 8 months after infection, but inconsistent findings are observed in longitudinal measurements in individual subjects (9, 10). This evidence concerns the gene CD8A and infection.