Detection of SARS-CoV-2-specific T cells in the convalescent subjects at 5–6 months post discharge. (A) Representative IFNγ ELISpot image. 0 –200k means 0–200k of PBMCs per well. (B) IFNγ ELISpot assay of spike- (left panel) and NP- (right panel) specific T cells from c#9 post-expansion. (C) Summarized IFNγ ELISpot data showing the frequency of S- and NP-specific T cells in the convalescent subjects. The experiment was done in duplicate. Data are presented as mean±SEM. HD, healthy donor; c, convalescent subject. MP-NP, NP peptide pool; MP-S, spike peptide pool.