Despite several participants in the moderate/severe infection group with between 0.5 and 2.9% of CD8+ T cells (Fig. 7a) and one participant with >20% of CD4+ T cells (Fig. 7b) producing IFN-γ in response to restimulation with SARS-CoV-2 N peptides pre-vaccination, there was no significant difference between the groups (Fig. 7a, b). This evidence concerns the gene CD8A and infection.