For the naïve vs previous infection group comparison, there was no statistically significant difference in the amount of IFN-γ produced in any of the three QuantiFERON tubes (Figure 1C), although the PITCH ELISpot was able to detect differences in S1 + S2 (P = 0.029) and M + NP (P = 0.007) when comparing the two groups (Figure 1D). This evidence concerns the gene IFNG and infection.