IFNG and infection: Among the vaccinated group, irrespective of prior infection, the comparison of IFN-γ levels among those who received Covaxin (BBV152) and those who received Covishield (ChAdOx1) showed no statistical difference (p-value 0.6099, Median (IQR) SFU/million: 96 (4-373) vs 72 (4-244) for Covaxin and Covishield respectively (Table 3, Figure 2B)).