After 17–18 months of natural infection, 88.8% (40/45) of convalescents had SARS-CoV-2 IFN-γ-secreting T-cell response (median: 161 SFCs/5 × 105 PBMCs, IQR: 59.5, 353.5 SFCs/5 × 105 PBMCs). The gene discussed is IFNG; the disease is infection.