IFNG and infection: When assessing all TH1 responses by participant infection and symptom status and using optimal cut‐offs defined above to identify positive responses, dual‐producing IFN‐γ+/IL‐2+ SARS‐CoV‐2‐specific T‐cell responses were present in 11 of 13 (84·6%) symptomatic participants, reducing to 5 of 11 (45·5%) amongst asymptomatic participants (Figure 2D).